Inner Canthal Distance Research Articles

Sexual dimorphism among medical students of north India assessed by interorbital circumference index

Background: The human body dimensions are affected by ecological, geographical, racial, gender, and age factors. Craniofacial anthropometry has become an important tool used in genetic counseling, reconstructive surgery, and forensic medicine. Orbital measurements are important in the evaluation of several systemic syndrome, craniofacial abnormalities, and also surgical treatment of post-traumatic telecanthus. Among these measurements, normal interpupillary distance, inner canthal distance (ICD), and outer intercanthal distance are the vital features to be known. Aims and Objectives: The aims and objectives of the present study were to assess the ICD, head circumference (HC), and circumference orbital index of male and female medical students of North India and find out gender differences in the respective parameters and thus to contribute the present finding to the available literature. Materials and Methods: This was an observational descriptive study conducted in the department of anatomy at a fixed time in 150 MBBS course students in the age group 18–22 years. The ICD and HC were measured using round end digital spreading Vernier caliper. Then, circumference interorbital index (CII) was calculated and analyzed. Results: The mean ICD in males was 3.44±0.33 mm and in females was 3.21±0.32 mm; mean HC in males was 56.03±1.55 mm and in females was 53.88±1.38 mm; and mean CII in males was 6.15±0.54 and in females was 5.95±0.51. Conclusion: The result of this study will help to establish the mean values for of craniofacial anthropometric parameters for medical students of North India, and the results are showing that craniofacial anthropometric parameters are sexually dimorphic.

A systematic review: facial, dental and orthodontic findings and orofacial diagnostics in patients with FASD.

The fetal alcohol spectrum disorder is a group of developmental disorders caused by maternal alcohol consumption. Patients with fetal alcohol syndrome show abnormal orofacial features. This review presents an overview over the facial, oral, dental or orthodontic findings and diagnostic tools concerning these features. For this systematic review Cochrane, Medline and Embase databases were considered and the review was performed according to the PRISMA checklist. Two independent reviewers evaluated all studies and recorded results in a summary of findings table. Risk of bias was analyzed via Quadas-2 checklist. 61 studies were eligible for inclusion. All included studies were clinical studies. Methods and results of the studies were not comparable, guidelines or methods for the detection of FASD varied across studies. Facial features most often measured or found as distinguishing parameter were: palpebral fissure length, interpupillary or innercanthal distance, philtrum, upper lip, midfacial hypoplasia or head circumference. This review shows that to date a multitude of heterogeneous guidelines exists for the diagnosis of FASD. Uniform, objective diagnostic criteria and parameters for the orofacial region in FASD diagnosis are needed. A bio database with values and parameters for different ethnicities and age groups should be made available for diagnosis.

Correlation between the Inner Canthal Distance and the Upper Central Incisor Mesiodistal Width Using the Decreasing Function of the Golden Ratio

Background: Optimal aesthetics without sacrificing function is one of the main goals of prosthodontists. The face is the most noticeable aspect of the body, and a grin significantly increases one's sense of self-worth. Since aesthetics and subsequently self-esteem are both impacted by the loss of anterior teeth, this frequently causes psychological anguish for the patient. The quality of life and self-esteem of patients are improved by the proper tooth location and choice employing the art of dentogenics to simulate real teeth. Aim: To determine whether there is a relationship between the average mesiodistal width of the upper central incisor and the inner canthal distance when the ICD is multiplied by the decreasing golden ratio, as well as to evaluate the significance of this relationship in predicting mesiodistal width of the upper central incisor in subjects with edentate disease. Methodology: This cross-sectional study was carried out at Department of Prosthodontics, Bacha Khan College of Dentistry Mardan from October 2022 to March 2023. Four hundred and fifty dentate Pakistani subjects without dental or facial abnormalities, aged 18 to 40, were examined. With the use of veriner callipers, the central upper incisors were noted mesiodistally amongst the interproximal contact sites and inner canthal space. The inner canthal space was multiplied by 0.618, and the width of the central incisor was calculated by dividing the result by 2. Results: Statistically significant finding demonstrated with inner canthal distance was exposed to the golden ratio. There was only a modest link among the practical mesiodistal width of the central upper incisors and the estimated central upper incisor width. Conclusion: For edentulous patients, choosing the width of the upper central incisors using the decreasing value of the inner canthal distance's golden ratio was not a valid predictor. Keywords: Edentulous, Golden ratio, Inner canthal distance (ICD)

INNER AND OUTER INTERCANTHAL DISTANCES IN A NIGERIAN POPULATION

This study investigated the inner and outer intercanthal distances in a Nigeria population. Materials and Methods: The cross sectional study was carried on 384 adults (males and females) between the ages of 18-35years. This study was carried in Abraka, Delta State, Nigeria. A pair of digital venier calipers was used to carry out anthropometric measurement of the inner and outer intercanthal distances measured between the medial and lateral ends of the palpebral fissures respectively.The canthal index (CI) was calculated as [ICD x 100]/OCD. Simple descriptive and inferential statistics were calculated from the data obtained. Gender and age differences were scrutinized using the students’ t-test and correlation respectively. P value <0.05 was accepted as significant difference. Results: The mean canthal dimensions for the Nigerian population was inner-canthal distance (38.65±1.49mm), outer-canthal distance (76.25±4.03mm), and canthal index (50.85±3.50). According to gender, inner-canthal distance was 39.15±1.44mm and 38.15±1.38mm, outer-canthal distance was 76.59±4.13mm and 75.89±3.91mm, and canthal index was 51.26±3.46 and 50.41±3.52 for male and female respectively. There was a significant difference (p<0.05) in the inner-canthal distance and canthal index between male and female. There was insignificant correlation between: age and inner-canthal distance (r= 0.082, p= 0.108), age and outer-canthal distance (r= -0.024, p= 0.641), and age and canthal index (r= 0.064, p=0.213). Conclusion: Sexual dimorphism occurred as the inner canthal distance and canthal index were significantly higher in males compared to females in the Nigerian population.

A Cross Sectional Study to Determine Periocular Parameters in Newborns At Different Gestational Age

Background: A nomogram of periocular measurements of newborn babies has its clinical implication in delineationof many syndromes.Aim: To measure periocular parameters like inner canthal distance (ICD), outer canthal distance (OCD), interpupillary distance (IPD) in newborns at different gestational age which will help in clinical evaluation of hypo andhypertelorism.Materials &Methods: This is a hospital based observational, cross-sectional study in a secondary care hospital ofWest Bengal. The study was carried among 250 newborns with gestational period ranging from 32 weeks to 42weeks who were born in obstetric department of the hospital during a period of 8 months. Ocular dimensions innewborns at different gestational age groups were measured on day 2, and the values are presented as mean +/- SDvalues for different gestational age groups. The data was collected by using structured schedule and was enteredin the Microsoft excel sheets and statistically analysed by SPSS 24.0 and Graph Pad Prism version 5. Results: Nosignificant difference noted between values of boy and girl babies. The values of different eye measurements haveshown a positive correlation with gestational age and birth weight. To the best of our knowledge, till date thereis only one such study from India.

ASSESSMENT OF THE RELATIONSHIP OF INNER-CANTHAL DISTANCE AND INTERALAR WIDTH TO THE INTER-CANINE WIDTH AMONGST THE POPULATION OF Chitwan

Background: There are many techniques and methods for estimating the maxillary anterior teeth in edentulous patient. Inner-canthal and inter- alar width are one of the methods to establish inter-canine width. The objective of our study is to assess the relation of inner-canthal distance and inter-alar width with inter-canine width and canine-to-canine distance. Methods: Based on inclusion and exclusion criteria, 161 participants were selected. Four parameters, Inner-Canthal Distance, Inter-Alar Width, Inter-Canine Width and Canine tip to Canine tip were measured using digital Vernier caliper. Data entry was done in Microsoft Excel and data analysis on SPSS 21. Descriptive statistics and independent t-test were used. The Pearson’s correlation coefficient was used to find association between continuous variables like Inner-Canthal Distance and Inter-Alar Width with Inter-Canine Width and Canine tip to Canine tip width. Results: Strong positive correlation was found between Inner-Canthal Distance and Canine tip to Canine tip (+0.065) among males. the multiplying factor of Inter-Alar Width and Inner-Canthal Distance was 1.002 to obtain Inter-Canine Width. Similarly, the multiplying factor of Inter-Alar Width was 1.006 and Inner-Canthal Distance was 1.003 to obtain Canine tip to Canine tip. Moderate positive correlation was found between inner canthal distance and canine tip to canine tip among Mongolians and weak positive correlation among Aryans. Conclusions: Study showed that Inner-Canthal Distance and Inter-Alar width can be used to determine combined width of maxillary anterior teeth and tip of canine-to-canine distance in absence of pre-extraction records during complete denture fabrication.

A comparative analysis of canthal index of ekowe indigenes, bayelsa state

Human body parts are useful in the predictive study of the unknown. The aim of this study is to know the normative values of the canthi of the Ekowe people. Measurements such as inner and outer canthal distances were carried out. The mean value of the innercanthal distance for males and females are 3.55±0.58 and 3.43±0.52. The mean outer canthal distance for male and female is 13.91±0.84 and 13.62±0.76. The canthal index for male and female is 25.59±4.54 and 25.30±4.03. Sexual dimorphism exists and statistical significant difference was noticed in the outer canthal distance between the males and females (P˂0.05). This study has provided us with normative reference values of inner and outer canthal distances and canthal index for the Ekowe Population which is import to the health care givers, Anatomist, ophthalmic industry and anthropologist

Asian upper blepharoplasty and dual‐plane epicanthoplasty: An integrated four‐step technique

Double-eyelid blepharoplasty and epicanthoplasty is usually performed concurrently in Asian patients to achieve aesthetically pleasing eye appearance, but the epicanthal area is prone to scarring. This article introduces an integrated four-step technique that enlarges the eyes with minimal scarring risk. One hundred and thirty-five patients who underwent Asian upper blepharoplasty and dual-plane epicanthoplasty between January 2019 and September 2020 were retrospectively reviewed. Palpebral fissure distance (PFD), inner canthal distance (ICD), and vertical height of the palpebral fissure (VHPF) were measured based on photographs taken pre- and postoperatively, with the diameter of the iris as the reference value, D. Patient-reported outcome measures (PROMs) were collected to evaluate patient satisfaction and complications. A total of 129 female and 6 male patients were included. The average follow-up duration was 12.9months. The average increasing ratio of PFD/D was 8.1%, whereas the average shortening ratio of ICD/D was 3.5%. The average VHPF/D increased by 10.6%. Statistical analysis was conducted using a paired t-test which demonstrated statistically significant results. A total of 96 patients responded to our patient-reported outcome measures (PROMs) at 6months postoperatively, with an average patient satisfaction score of 62.9 out of 70 (89.8%). Barely visible scarring for the upper eyelid and the inner canthus were reported by 90.6% and 85.4% of patients, respectively. Three (3.1%) patients were not satisfied with the scar in the medial canthal area 6months after surgery. The integrated four-step blepharoplasty and dual-plane epicanthoplasty is an effective, reliable, and reproducible method with high patient satisfaction and minimal scarring risk.

Growth Pattern and Use of Inter-pupillary Distance in the Detection of Ocular Hypertelorism and Hypotelorism in Indian Down Syndrome Children.

Use of inter-pupillary distance (IPD) for objective evaluation of ocular hypertelorism and hypotelorism is recommended to corroborate diagnosis of syndromic conditions. In view of complete absence of serial data on growth of IPD, this study aims to unfold auxological dynamics of IPD in Down syndrome (DS) children of Indian origin. Inner canthal distance (ICD) and outer canthal distance (OCD) were measured on a total of 1,125 (male: 752, female: 373) DS children, aged 0 to 3 months to 10 years at 6 monthly age intervals using a "Digimatic Sliding Caliper" in the Growth Laboratory/Growth Clinic of the Institute. Using Feingold and Bossert (1974) formula, IPD at each age was calculated from ICD and OCD measured among male and female DS children. IPD, like OCD and ICD increased un-interruptedly among DS children. IPD grew rapidly up to 5 years thereafter, its rapidity became slower. Boys in general, possessed larger IPD than girls, however, gender differences became statistically significant up to first 4 years of life. Our study children possessed significantly smaller IPD as compared with their normal Indian counterparts. None of our DS children depicted ocular hypertelorism while hypotelorism, was noticed amongst 4.9% male and 16.8% female DS patients. Comparison with normative IPD data failed to establish existence of ocular hypertelorism in DS children (<10 years) of north-western Indian origin. Use of age and gender-specific data presented for IPD of DS children may be made for comparative purpose to ascertain inter-population variability.

A Novel Study on Alar Mobility of HAN Female by 3dMD Dynamic Surface Imaging System.

The aim of this study is to conduct a quantitative analysis on alar mobility of HAN females and provided referenced materials for alar dynamic aesthetic. One hundred and fifty healthy HAN females without rhinoplasty, nasal injury, nasal deformity and craniofacial deformity were included in this study. 3dMD surface imaging system was used for anthropometric analysis. All participants were instructed to perform the desired dynamic facial expression from rest to maximum smile without reveling teeth and recorded by 3dMD dynamic surface imaging system simultaneously. Two frames of rest status and alar maximum enlargement were selected for measuring alar width, alar base width and inner-canthal distance. The difference between two status represented alar mobility, which was generated through equation: [Formula: see text]. Alar mobility consisted of alar flaring mobility and alar base mobility. The alar flaring mobility was (9.49 ± 4.90)%, reference range was(1.45, 17.53)% and regression equation between rest and maximum smile was Y = 7.953 + 0.886X (R2 = 0.641, p = 0.000); the alar base mobility was (17.94 ± 10.44)%, reference range was (0.88, 35.00)% and regression equation between rest and maximum smile was Y = 4.481 + 0.966X (R2 = 0.528, p = 0.000. Asian alar anatomy has great distinction from Caucasian, processing conspicuous alar movement and damaging alar aesthetic dynamically. This study novelly defined alar mobility by three-dimensional anthropometric analysis, providing objective references for alar dynamic aesthetic and arousing plastic surgeons' attention on keeping balance of static and dynamic aesthetic in rhinoplasty. This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Anthropometric Assessment of Canthal Distances and Canthal Index of South Indian Region: A Cross-Sectional Study

Background: Orbitofacial anthropometric measurements can be used in identification of gender and ethnicityin forensic anthropology. It also plays a crucial role used in plastic surgery and for identifying geneticsyndromes. Canthus is the term employed to explain the either corner of the eyes. Inner canthus is alsocalled as medial or nasal canthus. Outer canthus, is otherwise called as lateral or temporal canthus. Normalcanthal values can function as a guide for the diagnosis of pathology and interventions for craniofacialabnormalities. Thus, it is necessary to have a knowledge about the local data of those parameters sincethis standard reflects the doubtless different pattern of craniofacial growth resulting from racial, ethnic,sexual and dietary differences. Hence this study is undertaken to find out the normative inner canthal andoutercanthal distance measurement in population of South Indian region.Aims and Objectives: The present study was done to find out the normal inner and outercanthal distanceand also canthal index of population of South Indian ethnic origin and also to analyse the sexual dimorphismin them.Materials and Method: This descriptive cross-sectional study was conducted on 200 volunteers of agegroup 18-25 years of both sexes belonging to South Indian region. Innercanthal distance(ICD) and Outercanthal distance(OCD) were measured using digital vernier caliper.Canthal index was calculated. All thedata were analysed using SPSS 16.0 version software and correlated with gender.Results: Mean innercanthal distance was found to be 2.64 ±0.51 cm in males and 2.51 ±0.46 cm in femalesrespectively in the present study. There is significant sexual dimorphism in ICD . The study also showedoutercanthal distance to be 10.35± 0.81cm in males and 10.19 ±1.02 cm in females respectively. Canthalindex was 25.71 ±4.91 in males and 24.83±7.83 in females. There is no significant sexual dimorphism inOCD and Canthal index.Conclusion: It was observed that all the values were significantly higher in males than females of southIndian ethnic origin. And there is a significant sexual dimorphism in inner intercanthal distance.

Ocular measurements in fetal alcohol spectrum disorders.

Fetal alcohol spectrum disorders (FASD) describe a range of physical, behavioral, and neurologic deficits in individuals exposed to alcohol prenatally. Reduced palpebral fissure length is one of the cardinal facial features of FASD. However, other ocular measurements have not been studied extensively in FASD. Using the Fetal Alcohol Syndrome Epidemiologic Research (FASER) database, we investigated how inner canthal distance (ICD), interpupillary distance (IPD), and outer canthal distance (OCD) centiles differed between FASD and non-FASD individuals. We compared ocular measurement centiles in children with FASD to non-FASD individuals and observed reductions in all three centiles for ICD, IPD, and OCD. However, when our non-FASD children who had various forms of growth deficiency (microcephaly, short-stature, or underweight) were compared to controls, we did not observe a similar reduction in ocular measurements. This suggests that reductions in ocular measurements are a direct effect of alcohol on ocular development independent of its effect on growth parameters, which is consistent with animal models showing a negative effect of alcohol on developing neural crest cells. Interpupillary distance centile appeared to be the most significantly reduced ocular measure we evaluated, suggesting it may be a useful measure to be considered in the diagnosis of FASD.

Normal interpupillary, inner canthal distance and outer canthal distance in a normal population of Pakistan.

Objective:This study was conducted to quantify the normal indices of anthropometric measures related to ophthalmology including Interpupillary distance (IPD), Inner canthal distance (ICD), Outer canthal distance (OCD) in a normal, healthy Pakistani population.Methods:This is a cross sectional study. Total 500 patients were chosen randomly but 499 were included in this study. Patients were selected randomly in an outpatient department of Jinnah Post Graduate Medical Centre Karachi, over the period of five months. IPD, ICD & OCD all measurements were taken with the help of plastic rule by only one researcher to minimize chances of error as much as possible. IPD was reconfirmed from auto refractometer while ICD and OCD readings were taken twice by occluding one eye of researcher to reduce error. Participants were divided into four categories on basis of: Age, Gender, ethnicity and geographical location. Patients were further categorized on basis of Ethnicity to Urdu Speaking, Sindhi, Punjabi, Pathan, and others. Moreover, four age groups were drawn ranging from 15-24 years, 25-44 years, 45-64 years and 65 years and greater.Results:Our study comprised a total of 499 patents of which 272(54.5%) were males, and 227(45.5%) were females. The mean age of the participants was 39.3 ± 14.5 years. The mean values for the IPD, ICD and OCD in mm were 61.8 ± 6.2, 30.9 ± 2.9 and 85.2 ± 6.6 respectively. A statistically significant difference was observed between IPD, ICD and OCD Indices among male and female study participants (p<0.001, p=0.043, p<0.001). While comparing the IPD, ICD and OCD indices amongst the different ethnic groups, we found no statistically significant difference (p=0.09. p=0.28, p=0.06). Overall, there was no correlation between the age and other variables i.e. IPD, ICD, OCD, (r = 0.07, p = 0.085), (r = 0.005, p = 0.906), (r = -0.08, p = 0.058).Conclusion:This work has recommended normative values of IPD, ICD and OCD in Pakistani population on the basis different variables including gender, age, and ethnicity.

An Anthropometric Comparison of Inner Canthal Distance, Outer Canthal Distance and Canthal Index in the Indian and Nepalese Undergraduate Students of Nepalgunj Medical College

Background: The canthal distances are one of the most important aspects in ascessing the facial aesthetics. Several authors have described changes in the canthal distances attributable to race and gender.Aims and Objectives: To compare the inner canntahl distance, outer canthal distance and canthal index in between Nepalese and Indian undergraduate students of Nepalgunj Medical College.Materials and Methods: The study was conducted to compare canthal distances and canthal index among 320 (160 Indians: 100 male,60 female and 160 Nepalese: 100 male and 60 female) undergraduate students of Nepalgunj Medical College of age group 18-24 years at Department of Anatomy, Chisapani, Banke. Inner canthal distance(ICD) and Outer canthal Distance(OCD) were measured by using round end spreading caliper and Canthal Index were calculated by ICD/OCD *100. The value obtained was compared among Indian and Nepalese students in both sexes by using student t-test.Result: The study showed that there was no any significant difference on the value of inner and outer canthal distances and canthal index observed between Nepalese and Indian population except on the value of canthal index which was significantly different between Indian male and Nepalese male population. However, when the comparison was done between the sexes, inner and outer canthal distances and canthal index of males are larger than females except on the value of canthal index of Indian males and Indian females which was non-significant.Conclusion: There occurred a sexual dimorphism within Indian and Nepalese population except on canthal index of Indian male and Indian female but there wasn't any significant differences between Nepalese and Indian population of same sex except on canthal index of Indian male and Nepalese male. JNGMC, Vol. 14 No. 2 December 2016, Page: 12-14

Ophthalmology national normative database series (3): Normal ranges of interorbital anthropometric values in healthy sudanese adults

Background: The face is the most distinctive part of the human body. Of all areas on the face, the bilateral orbital regions which are located in the upper half of the face act as a strong influence in the perception of facial attractiveness, esthetic criteria, and “ideal” features of any certain nation. This fact increases the needs for interorbital anthropometry or interocular distances (IODs) which refers to the measurements of the human far interpupillary distance (FIPD), near interpupillary distance (NIPD), outer canthal distance (OCD), and inner canthal distance (ICD) among individuals of different age, sex, and ethnicity. Objective: To assess the normal ranges of interorbital anthropometric values among adult healthy Sudanese population and to define the effects of age, gender, and tribal ethnicity on interorbital anthropometry. Materials and Methods: Systematic interorbital anthropometric measurements were done in 920 Sudanese adults aged 20–85 years. Parameters included were FIPD, NIPD, OCD, and ICD across age, sex, and tribal ethnic perspective of the study subjects. Comparisons were made between their gender, age, and tribal ethnicity using the Chi-square test. Results: The study included 565 female (61.4%) and 355 male (38.6%) subjects with mean age of 48 ± 20 (range 20–85) years. Significant age, gender, and ethnical dimorphism were noted in the following parameters. OCD (male: 92.23 mm; female: 90.79 mm), FIPD (male: 63.20 mm; female: 61.57 mm), NIPD (male: 59.34 mm; female: 57.73 mm), and ICD (male: 34.30 mm; female: 33.00 mm). Conclusion: Significant interorbital measurement differences were found between Sudanese males and females in different age and ethnic groups. The present study suggests that age, gender, and ethnicity should be considered in Sudanese esthetic criteria and “ideal” features in any cosmetic or reconstructive orbital surgery. To individualize the treatment planning and diagnosis, it is important for the surgeons to have knowledge of these local Sudanese interorbital norms.

Ophthalmology national normative database series (4): Normal ranges of interorbital anthropometric values in healthy sudanese children

Background: The knowledge of the normal ranges of interorbital anthropometric values among schoolchildren aged 6–15 years is very important because normal values of facial measurements, inner canthal distance (ICD), outer canthal distance (OCD), canthal index, and circumferential interorbital index are useful parameters in the evaluation and treatment of congenital or posttraumatic deformities of the cephalic and facial regions such as telecanthus, ocular hypotelorism, and craniosynostosis. Objective: To assess the normal ranges of interorbital anthropometric values in schoolchildren and to measure the interorbital distances and to define the effects of age and gender in Al-Shifa area, Khartoum State. Materials and Methods: Systematic interorbital anthropometric measurements were done in 980 schoolchildren aged 5–16 years. Measurements of far Interpupillary Distance (FIPD), Near Interpupillary Distance (NIPD), Outer Canthal Distance (OCD) and Inner Canthal Distance (ICD) were taken in all study population. Comparisons were made between their gender and age using the Chi-square test. Results: In total, 980 individuals were studied. Out of these, 675 (68.9%) individuals were boys and 305 (31.1%) were girls. The mean age of the study group was 9.47 ± 2.71 years; there was a statistically significant difference in all measurements (P Conclusion: Significant interorbital measurement differences were found between Sudanese children according to gender and age. The present study suggests that age and gender should be considered in Sudanese children in any orbital surgery. To individualize the treatment planning and diagnosis, it is important for the surgeons to have a knowledge of these local Sudanese interorbital norms.

Correlation between Innercanthal Distance and Mesiodistal Width of Maxillary Anterior Teeth in a Thrissur, Kerala, India, Population.

Selecting and replacing missing teeth to natural proportions and esthetic preference of a patient in the absence of pre-extraction records is a very challenging task. Although facial analysis and proportions are well discussed in many populations, none exists for the Thrissur, Kerala, population. A prosthodontic rehabilitation for Kerala patients relying on other racial norms may result in dissonant facial proportions. Therefore, the purpose of this study was (1) to evaluate the validity of innercanthal distance as a guide in determining the mesiodistal dimension of six maxillary anterior teeth in a selected Malayalee population in the Thrissur Municipal Corporation area; (2) to check whether innercanthal distance undergoes dynamic changes over time as a result of aging; and (3) to evaluate whether there is a gender difference in the analyzed mean facial and dental proportions in this population. The study was conducted on 1,200 subjects in the Thrissur Municipal Corporation area. From five wards, 240 subjects were selected, out of which 120 were from the 18 to 25 years age group and 120 from the 40 to 50 years age group. Sixty males and females were selected from each group. The innercanthal distance was measured using a Digital Vernier Caliper, and alginate impressions were made to evaluate the size of maxillary anteriors. The data was analyzed statistically. The study showed that there is a high statistical significance between the innercanthal distance and the mesiodistal width of six maxillary anterior teeth in females (p < 0.01) and no significance in males. There was also dynamic changes in the innercanthal dimension and the mesiodistal width of maxillary anteriors with increase in age (p < 0.001). The difference in the mean of innercanthal distance between the genders was highly statistically significant, but no significance was found between the genders in the mesiodistal width of maxillary anteriors. Within the population evaluated, there was a high statistical significance in females between the innercanthal distance and the mesiodistal width of six maxillary anterior teeth, but not for males. Innercanthal dimension was found to undergo dynamic changes as age increases in both males and females, and it was much higher in males than in females. There was no statistical significance in the comparative evaluation of mesiodistal width of maxillary anteriors of males and females in the study. Teeth selection is a critical step in determining the outcome of successful prosthodontic treatment. No definite guidelines for the selection of maxillary anterior teeth pertaining to the Thrissur, Kerala, population exist. A prosthodontic rehabilitation of Thrissur, Kerala, patients relying on other racial norms will result in dissonant facial proportions. In selecting maxillary anterior teeth, the knowledge of racial norms will help specify certain esthetic and functional modifications in treatment plans, which might be specific to each group. Therefore, there remains an unquestionable need for a scientific and reliable method for maxillary anterior teeth selection, which can be applied on this group of Indian population.

Selecting maxillary anterior tooth width by measuring certain facial dimensions in the Kurdish population

Statement of problemOne of the most difficult aspects of complete denture fabrication is selecting appropriately sized maxillary anterior teeth that will harmonize with the face. There are no generally accepted or naturally observed principles to guide dentists in this selection. PurposeThe purpose of this study was to determine whether a relationship exists between various facial measurements and the different single or combined mesiodistal widths of maxillary anterior teeth in a Kurdish population. Material and methodsA total of 65 Kurdish dental students participated in this study. Two standardized digital photographs of the face (relaxed and smiling capture) were recorded. The interpupillary distance (IPD), inner canthal distance (ICD), interalar distance (IAD), and width of the 2 central incisors were determined by Image J software. The mesiodistal width and the combined straight-line width of the centrals, laterals, and canines were measured directly from the casts of the participants with digital calipers. A simple linear regression and the Pearson correlation coefficient were used to investigate the relationship between the particular facial measurement and the widths of the anterior teeth (α=.05). ResultsSignificant correlations existed between the IPD and different tooth measurements; the highest was with the mean width of the canines (r=0.55). The proposed proportion between the IPD and the central incisor width was 6.93. The golden proportion of the ICD to the width of the central incisors and of the IAD to the straight-line width of the 6 anterior teeth could be used as a dependent parameter in Kurdish men. ConclusionsThe IPD can be used to predict the width of anterior teeth in both sexes. In men, the width of the central incisors may be estimated from the ICD and the straight-line width of the 6 anterior teeth from the IAD.

The relationship between innercanthal dimension and interalar width to the intercanine width of maxillary anterior teeth in central Indian population.

Statement of Problem:Selection of proper sized maxillary anterior teeth is one of the difficult clinical steps in complete denture esthetics. Several studies have been reported to establish methods of estimating the combined width of maxillary anterior teeth.Purpose:The aim of this study was to determine whether a relationship exists between the innercanthal distance (ICD) and interalar width (IAW) with the combined width of maxillary anterior teeth.Material and Methods:The maxillary anterior teeth of 600 adult subjects were examined. ICD was measured between the median angles of the palpebral fissure. IAW was measured between the ala of the nose at their widest point. The mean combined width of the maxillary anterior teeth was determined intraorally at their widest dimension. Pearson's correlation coefficients were calculated to determine the relationship between ICD, IAW and the combined width of maxillary anterior teeth (α =0.05).Results:Although the Pearson correlation coefficients were relatively small, a significant relationship existed between innercanthal dimension and IAW (P < 0001).Conclusion:Within the limitations of this study, the results suggest that ICD and IAW cannot be used as a preliminary method for determining the width of the maxillary anterior teeth for edentulous patients.

Determination of mesiodistal width of maxillary anterior teeth using inner canthal distance

BackgroundSelection of appropriately sized maxillary anterior teeth is one of the important aspects of complete denture prosthodontics. In the past several methods have been proposed, but little consensus on an effective method for anterior teeth selection has been reached. Inner canthal distance is one of the reliable anatomic dimension that may provide a valid approach to anterior teeth selection. This study was aimed to ascertain the co-relation between inner canthal distance (ICD) and combined mesiodistal width of maxillary anterior teeth. MethodThis study was conducted in Army Dental Centre (R & R) Delhi Cantonment between Aug 2006 to Mar 2008. Eight hundred dentate Indian subjects of four different ethnic group; Such as Rajputs, Marathas, Sikh and Tamilian. 100 males and 100 females from each race under the age group of 18–30 years formed the subjects of study. The ICD and mesio-distal width of maxillary anteriors were measured using Digital Vernier Caliper. The Data obtained was statistically analyzed. ResultsA consistent ratio of 1.61 was found between ICD and combined mesiodistal width of maxillary anteriors in all four ethnic group. The mean value showed no statistically significant difference between sex. The variation in the ratio between the ethnic groups was negligible. ConclusionThe findings of the study indicated that, to select the combined mesiodistal width of maxillary anterior teeth, ICD of the required patient should be multiplied by 1.61. This ratio was consistent with all the four ethnic groups irrespective of sex.