Interalar Width Research Articles

Relationship between permanent upper anterior teeth and anthropometric facial measures in different populations

Aim: The main purpose of this study was to conduct a narrative review investigating the possible relationship between permanent maxillary anterior teeth and anthropometric facial parameters in different populations. Methods: Searches were performed in the PubMed, BVS (Biblioteca Virtual em Saúde) and SciELO databases to identify relevant scientific articles using the following search terms: “maxillary anterior teeth”, “facial measurements” and “anthropometry”, in such a way that 218 publications were found. After application of inclusion and exclusion criteria, 13 publications remained for full-text reading. Results: All studies involved male and female samples and it was notorious that male measurements were unanimously higher than those obtained in the opposite sex. The age of the analyzed participants ranged from 17 to 60 years; however, a mean age of 18 to 25 years was the most investigated in literature. In addition, facial measurements including the bizygomatic width, interpupillary distance, intercanthal distance, interalar width and intercommissural width have been proposed to help determine the correct size of anterior teeth. Conclusion: It was concluded that despite the limited number of studies, some factors that influence dental and facial dimensions, such as sex and age, can be identified. However, there is no standardization of the facial or dental parameters used in the studies, a fact that makes it difficult to establish a universal ratio for clinical dental practice.

Correlation between different points on the face and the width of maxillary anterior teeth

Statement of problemThere is currently no consensus on the relationship between maxillary anterior teeth and different facial anthropometric measurements. Additionally, whether these relationships vary by age and sex remains unreported. PurposeThis clinical study aimed to investigate the relationship between the intercanine distance (ICaD) and intercanthal distance (ICD), interpupillary distance (IPD), interalar width (IAW), and intercommissural width (ICW), and to compare whether these relationships differ between different age and sex populations. Material and methodsParticipants (n = 409) were enrolled according to the inclusion criteria, and their standardized digital images were taken to measure facial and oral segments through an image processing program. The differences between ICaD and four facial measurements and the sexual differences for all measurements were compared using the 1-sample t-test. The differences among different age groups for all measurements were compared using the one-way analysis of variance (ANOVA) test, and a least significant difference (LSD) test was used for multiple comparisons. The association between ICaD and the four facial measurements was evaluated using Pearson correlation analysis. The correlation between ICaD and four facial measurements was evaluated using linear regression. Differences in regression equations among the subgroups were evaluated through subgroup regression analysis and the significance test of the difference between the two regression coefficients. Tests of significance were two-sided, with alpha level of 0.05. The reliability of the results was evaluated by calculating intraclass correlation coefficients. ResultsThe ICD, IPD, ICW, and IAW significantly differed from the ICaD in both sexes (P < 0.01). All measurements were significantly greater in men than in women (P < 0.01). The differences among the age groups were statistically significant for all measurements except IPD (P < 0.05). A significant positive correlation was found between all facial measurements (r = 0.258 [ICD], r = 0.334 [IPD], r = 0.389 [ICW], and r = 0.393 [IAW]) and the ICaD in both sexes. The highest correlation was found between ICW(r = 0.345) and ICAD in men and IAW (r = 0.285) and ICAD in women. Except for the 20–29 and 50–59 age groups, the mathematical equations of ICaD and facial anthropometric measurements differed among the other age groups and sexes. ConclusionsICD, IPD, ICW, and IAW cannot be directly used to determine ICaD in both sexes. Nevertheless, when observed from the frontal aspect, by the use of digital images, all facial measurements correlated to the intercanine distance, with a high probability. The mathematical formulae combined with facial anthropological measurements can help ensure the combined width of the six maxillary anterior teeth, but the effects of sex and age differences should be considered.

Relationship between Inter Canine Width and Inter Alar Width, Inter Commissural Width, and Inter Canthal Distance: A Pilot Study

Relationship between Inter Canine Width and Inter Alar Width, Inter Commissural Width, and Inter Canthal Distance: A Pilot Study

P121 Use of custom silicone putty device for nasal tube stabilisation in orthognathic surgery to minimise alterations in nasio-labial angle, inter-alar width, and nasal septa distortion, as an alternative to submental intubation

P121 Use of custom silicone putty device for nasal tube stabilisation in orthognathic surgery to minimise alterations in nasio-labial angle, inter-alar width, and nasal septa distortion, as an alternative to submental intubation

Correlation Between Maxillary Anterior Teeth and Common Facial Measurements.

The symmetry between maxillary anterior teeth and the face holds significant importance. This study assessed and analyzed the relationship between facial parameters and anterior teeth in the maxillary arch of male and female subjects. Specifically, individual width and combined width (CW) measurements of the maxillary anterior teeth were investigated. This study involved a total of 150 dentate Yemeni subjects (74 men and 76 women), whose ages ranged from 18 years old to 30 years old. A maxillary cast was created, and two digital photographs of the face of each subject were taken and analyzed. Digital calipers and AutoCAD were used to gather measurement data of the dental parameters (intercanthal distance [ICD], interpupillary distance [IPD], interalar width [IAW], intercommissural width [ICW], and bizygomatic width [BZW]) and facial parameters (profile distance). Significant correlations were found for the following: IPD and width of six maxillary anterior teeth of each of the study subjects; ICD and their central incisors; and BZW and their canine width measurements. In contrast, IAW and ICW were not correlated with all tooth measurements. Linear regression findings showed that the CW measurement of the four incisors was significantly correlated with all facial parameter measurements, excluding the ICW and IAW in females and the IAW, ICW, and profile distance in males. The IPD and ICD of males and females may be used to determine their CW measurements. The BZW and IPD of males can be used to take precise anthropological measurements of the width of the central canines and incisors. Meanwhile, the IPD distance of females can be used to assess the central and lateral incisor widths.

Analysis of the Facial Measurements and Dental Arch Dimensions for the Construction of Dental Prostheses among Adult Yemenis.

To investigate the dental arch dimension (width, length, and height) and facial measurements including inner-canthal width (ICW), bizygomatic width (BZW), inter-alar width (IAW), and mouth width (MW), and to assess the correlation between these facial measurements and dental arch width (canine width [CW], inter-first premolar width [I1PW], and inter-first molar width [I1MW]), to establish a preliminary reference for artificial teeth selection in Yemeni adult. The study included 80 individuals (40 males and 40 females) with symmetrical faces and normal class I occlusion ranging in age from 20 to 35. Maxillary and mandibular stone casts were made for each individual. The dimensions of dental casts and facial measurements, including ICW, BZW, IAW, and MW, were assessed using a digital caliper. The collected data were analyzed by using the SPSS software program. The descriptive statistics for each measurement were made. Differences between males and females were tested using an independent-sample t-test with p-values below 0.05 considered significant. Pearson correlation coefficient between facial measurements and dental arch width was also done. Most dental arch dimensions and facial measurements exhibited larger mean values in the male than in the female group, with the greatest significant difference in the maxillary dental arch width and the lowest in mandibular dental arch length. A highly significant correlation is observed between ICW and maxillary canine width (CW) (r = 0.318, p = 0.004). In contrast, no significant correlation between dental arch width and BZW, IAW, and MW is shown. Within this study's limitations, the ICW can determine the ideal dimension of the artificial teeth in the anterior maxillary arch. While the other facial parameters, including BZW, IAW, and MW, cannot be used for artificial teeth selection in Yemeni populations. The findings of this study established a reference database of facial measurements and their correlation to dental arch and teeth width in Yemeni populations. So, it can be implemented in artificial teeth and dental prostheses design and construction.

Use of custom silicone putty for nasal tube stabilisation in orthognathic surgery

Orthognathic surgery typically contraindicates standard oral intubation techniques. Nasal intubation may distort the nasal profile thus complicating orthognathic surgery involving the midface. Using silicone putty to stabilise the tube in a custom position may minimise these changes. A prospective analysis was undertaken of patients undergoing nasal intubation with and without silicone putty stabilisation. Pre- and post-intubation measurements were made of nasolabial angle and interalar width. Silicone putty significantly reduced the changes of nasal intubation on nasolabial angle (p < 0.001) but did not affect interalar distance (p > 0.05). Silicone putty should be considered to stabilise the nasotracheal tube in orthognathic surgery.

THE RELATIONSHIP BETWEEN INTERCANTHAL WIDTH, INTERALAR WIDTH, COMBINED WIDTH OF FORE FINGER, MIDDLE FINGER, AND RING FINGER OF RIGHT HAND TO THE INTERCANINE WIDTH OF MAXILLARY ANTERIOR TEETH IN SOUTH INDIAN POPULATION- AN IN VIVO STUDY

Purpose-The objective is to evaluate the relationship between Intercanthal width, interalar width, combined width of fore finger, middle finger, and ring finger of right hand to the intercanine width of maxillary anterior teeth in south Indian population Materials and Methods- one hundred thirty six patients were evaluated for innercanthal, interalar, combined width of fore finger, middle finger, and ring finger of right hand to the intercanine width of maxillary anterior teeth, the studys statistical test was done by one-way ANOVA test. Result-the values of Mean ± SD were Intercanine distance 40.510 ± 1.954, inter alar width 40.672± 1.785 eye width 37.969 ± 2.37 and combined finger width 40.397 ± 1.969 and df: 2, F: 11.578, p-value : 0.001(p&lt;0.05) were obtained which implies statistical significance. Conclusion-Within the limitation of the study, it was concluded that there is a significant correlation between intercanine width and inter alar and combined width of three fingers. There is statistically significant difference has been noticed between intercanine and inter canthal distance.

CORRELATION OF INTERALAR WIDTH AND MAXILLARY INTERCANINE WIDTH IN DENTATE SUBJECTS OF GANDHARA UNIVERSITY, PESHAWAR

Objectives: The present study aims to fi nd out the correlation of maxillary anterior teeth and the nose width in a dentate study population of Gandhara University, Peshawar.Methods and materials: The study population was the students of Gandhara University, Peshawar. Out of these a total of 211 students were invited to participate in the study. Both male and female were included in the sample population. Ethical clearance was obtained from the institution of the University. Informed consent was also obtained from the participants of the study. Interalar width was measured with Vernier caliper and the Intercanine distance was measured on a cast obtained from impression of the arch.Results: A correlation was found between the interalar widths and combined mesio-distal dimensions of anterior 6 maxillary teeth; however, when compared in males and females the diff erence was not signifi cant.Conclusion: Although nose can be used as guide for selection of maxillary anterior teeth width, however more than one guide must be used for predictable results.

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.

P104. ASSOCIATIONS OF MASCULINITY-FEMININITY, FACIAL RATIOS, AND ATTRACTIVENESS: INSIGHTS FROM AN ANALYSIS OF 827 INDIVIDUALS

PURPOSE: Males and females have known differences in anatomic facial features coding for sex, which are important for planning gender affirming facial surgery. This study hypothesized certain anatomic facial ratios are associated with perceptions of masculinity-femininity and sex. METHODS: This study used Chicago Face Database, a domain of facial measurements and metrics by 1,087 raters. Sex and ratings of masculinity-femininity were compared to facial anatomic indices, which characterized facial feature relativity (higher ratio scores indicated greater facial feature representation), including “nasal width ratio”= (interalar width)/(face width)*100, nasal length, eye height, eye width, forehead, lip, and chin. RESULTS: In 828 individuals, femininity was associated with eye height/width, lip, and nasal length indices, while masculinity was associated with chin, forehead, and nasal width indices (p<0.01). Among males alone (n=406), femininity was associated with eye height, lip, and nasal length indices; among females alone (n=421), masculinity was associated with nasal width and chin indices (p<0.01). Multivariate logistic regression models revealed nasal width and chin indices interact to predict male sex (OR=1.012, p=0.010), while nasal length and lip indices interact to predict female sex (OR=0.987, p=0.001). CONCLUSION: Our data suggest nasal length and lip indices interact to predict female sex while nasal width and chin indices interact to predict male sex. An understanding of these facial proportions may benefit those who perform facial feminization/masculinization surgery.

Comparative Evaluation of the Relationship between Different Anthropometric Measurements on the Face with the Mesiodistal Width of the Maxillary Central Incisor in Males and Females in Local Population in Pune, India

Aims: To compare the width of the central incisor obtained by the given formulae with the actual width of the central incisor in males and females and assess whether the interpupillary , interalar ,intercommisural and interlateral canthus widths are reliable anthropometric measurements to give an accurate value of the width of the central incisor in local population.&#x0D; Study Design: Original Research.&#x0D; Place and Duration of Study: Department Of Prosthodontics and Crown and Bridge, Dr. D. Y. Patil Dental College and Hospital, Pimpri, Pune. Dr. D. Y. Patil Vidyapeeth, Pune – 411018, between June 2009 and July 2010.&#x0D; Methodology: A total of 160 participants [Males=80; Females=80] were selected in the age group of 18-25 yrs which fulfilled the selection criteria. Informed consent was obtained from each student before participation. The following anthropometric measurements were performed: CW which is the mesiodistal width of the maxillary central incisor, interpupillary width (IPW) and the interalar width (IAW), intercommisural width (ICW) and interlateral canthus width (LCW) which were calculated using a digital vernier calliper. The differences and variables were studied by sex and the differences in the expected mesiodistal width of the central incisor by IPW/CW=6.6 and CW=IAW/4 with the real value was evaluated. The values were evaluated and the differences helped in determining whether these anthropometric measurements can be used as a guide for selection of artificial teeth in males and females in local population.&#x0D; Results: As per this study conducted, in males &amp; females there was statistically significant correlation between the width of the central incisors (CI) and the interalar width IAW (P value =0.043) and the interpupillary width IPW (P value =0.003) when calculated by formula CI=IAW/4 and CI=IPW/6.6. There was no statistically significant correlation between the width of the central incisor and the interlateral canthus width (LCW) and the intercommisural width (ICW).&#x0D; Conclusion: There was significant correlation between the interalar width and interpupillary width and the width of the central incisor. Thus, interalar width, when divided by 4, and the interpupillary width when divided by 6.6 was a reliable predictor of the selection of the maxillary central incisor width in females and males in local population.

An analogy between maxillary anterior teeth dimensions measured using facial proportions and Chu proportion gauge: an in vivostudy

Background:A fine balancing of geometric concepts and artistic abilities is required while designing smiles. One of the key elements that makes up the smile frame is tooth size. The maxillary front teeth are the most noticeable in the smile arch, therefore choosing the right tooth size and positioning it in the maxilla improves both aesthetics and treatment outcomes.Aim:This study aimed to compare the dimensions of maxillary anterior teeth measured with vernier callipers and CHU proportion gauge with facial proportions such as intercanthal distance, interalar width and bizygomatic width.Materials and Methods:On a sample of 100, Facial proportions, mesiodistal width, and height of maxillary anterior teeth were recorded using digital callipers and a Chu proportion gauge. The recorded data were subjected to statistical analysis. Mean comparisons of each width were done using a t-test, ANOVA and Tukey’s Post-hoc test considering a p-value less than 0.05 to be statistically significant. Results:Mean values of the combined width of anteriors calculated using Chu gauge was 45.08, and that calculated using Vernier Callipers was 45.85. Multiplying the factor 1.47 to Inner canthal width and 1.42 to Interalar width results in the combined width of the maxillary anterior teeth. A mean difference of 0.02620 ± 0.91777 and 0.4988 ± 0.91777 exists between Inner canthal and Combined Chu’s width with a 0.04% and 0.34% error in younger and elder age populations, respectively. A mean difference of -11.4775 ± 0.91777 and -11.6039 ± 0.91777 exists between Combined mesiodistal width obtained by using Chu’s width and bizygomatic width witha 0.01% error in younger and elder age populations, respectively.Conclusions:This study reported a negligible 0.7 difference in the means of the combined width of anteriors calculated using Chu gauge and Vernier Callipers. Hence, these two methods can be used as alternatives to calculate the width of anterior teeth

Relationship of Interalar and Intercommissural Distance with the Width of Maxillary Anterior Teeth

Introduction: The anterior teeth are primarily selected to satisfy esthetics. Their selection requires the dentist’s artistic skill and scientific knowledge. This clinical study was conducted to explore the relationship of interalar and intercommissural distance with the combined width of maxillary anterior teeth. Materials and Methods: Measurements of the parameters was made using a Digital caliper. The patient was seated up right position and asked to look straight; the intercommisural and interalar width were measured between commissures and ala without applying pressure. The combined width of maxillary anteriors form the distal surface of left and right canines were measured with a dental floss, which was then sectioned and measured. Each parameter was measured three times and the average value was computed and recorded. Results: Mean Interalar, intercommisural and intercanine distance were 34.72 mm, 48.9 mm and 49.61 mm respectively. Statistical analysis revealed a highly significant difference between the interalar width, intercommisural width and intercanine width of male and female respectively. Spearman’s rho analysis showed a highly significant correlation between Inter canine and both inter alar width (r=0.098, p &lt;0.04) and Intercommisural width (r=0.234, p &lt;0.05). Similarly, Spearman’s rho analysis in both sexes showed a highly significant correlation between intercanine and intercommisural width however such correlation was not seen between intercanine and inter alar width. Conclusions: This study concluded that there is significant correlation between interalar and intercommissural width with the combined width of maxillary anterior teeth. The inter alar and inter commissural width may be a useful guideline for the selection and replacement of maxillary anterior artificial teeth.

Le Fort I osteotomy and soft tissue response: A retrospective cohort study comparing three different techniques

The aim of this study was to evaluate the nasolabial soft tissues effects in three different Le Fort I osteotomy techniques using cone beam computed tomography (CBCT) evaluation of three-dimensional (3D) volume surfaces.A retrospective study was designed, and three groups were evaluated: group 1, patients who underwent conventional Le Fort I osteotomy; group 2, patients who underwent subspinal Le Fort I osteotomy; and group 3, patients who underwent conventional Le Fort I osteotomy with ANS recontouring or removal. CBCT evaluation was performed at two time points: T0, 1 week before surgery; T1, 6 months after surgery.A total of 90 patients were enrolled in this study (group 1: 30; group 2: 30; group 3: 30). Mean maxillary advancement was 4.26 mm. For group 1, mean change in inter-alar width was 2.29 ± 1.57 mm (minimum -2mm; maximum 6.1 mm; for group 2 it was 1.20 ± 1.56 mm (minimum −1.7 mm; maximum 5.9 mm), and for group 3 was 1.84 ± 1.76 mm (minimum −2.3 mm; maximum 5.9 mm). For group 1, mean change in alar base width was 1.69 ± 2.32 mm (minimum −4.8 mm; maximum 6,1 mm); in group 2 it was 0.85 ± 2.08 mm (minimum -4mm; maximum 6 mm), and group 3 was 1.21 ± 1.83 mm (minimum -2mm; maximum 5 mm). Results showed statistically significant differences in nasolabial area (P < 0.001).Within the limitations of the study it seems that subspinal Le Fort I osteotomy should be preferred when the priority is to avoid changes to the nasolabial region.

Which Lighting Option Is the Best for Photography in Rhinoplasty?

Photography for preoperative analysis and follow-up is indispensable for the facial plastic surgeon. The use of strobe flash units, light-emitting diode (LED) lamps, and their position related to axis of the patient can affect the nasal contours and nasal measurements. The aim of this study was to compare the rhinoplasty pictures taken under three different lighting settings and two different positioning at 30- and 45-degree angles, and with direct measurements taken by caliper from the subjects. Standardized rhinoplasty pictures from 10 patients were taken in frontal view in a studio. These pictures were taken under three different lighting settings: built-in flash of the camera, two strobe flashes, and two LED continuous lights placed at 30 to 45 degree angles to the patient. All the pictures were uploaded to Rhinobase 2.0. In five subjects, direct measurements were done by using a Vernier caliper and compared with the computer measurements. In this study, when comparing the light sources and the angles without taking single flash into account, no relation was found between strobe lights at 30 and 45 degrees and between LED lights at 30 and 45 degrees regarding tip width, base bony width, dorsum width, interalar width, and nasal length. However, a statistically significant difference was found when the angle was changed from 30 to 45 degrees for tip width, interalar width and nasal length. The use of two LED continuous lights or two strobe lights in a studio setting has given similar results. Changing the angles of the light sources from 30 to 45 degrees affected only the tip width and the interalar width; otherwise the rest of the nasal measurements did not show any significant changes. The pictures taken at 45-degree angles to the subject showed the closest values to the direct measurements done on the patient.

Determining of canine position by multiple facial landmarks to achieve natural esthetics in complete denture treatment

Statement of problemAnterior tooth selection is an important step in complete denture treatment as it plays a pivotal role not only in esthetics but also in mastication and pronunciation. However, conventional methods for tooth selection are not well established and rely on facial measurements and proportions, which vary among different ethnicities. PurposeThe purpose of this clinical study was to investigate the relationship between interalar width and intercanine distance and to compare different clinical methods for determining the position of the canine tooth. Material and methodsTwo hundred Thai participants (100 men and 100 women) aged 18 to 25 years with 6 full maxillary anterior teeth were enrolled in this study. The interalar width and intercanine distance were measured with digital vernier calipers and compared by using the paired-samples t test. To determine the canine position, 2 reference lines—the alar line (A line) and the inner canthus of the eye to alar line (IA line)—were drawn through the canine on both sides. The horizontal distances from each reference line to the canine cusp tip and distal contact point were evaluated and then analyzed using the 1-sample t test. ResultsAll measurements were significantly different between men and women (P<.01). Interalar width was greater than intercanine distance in both sexes. In men, the A line coincided with the canine distal contact point (P>.05). In contrast, the IA line was distal to the canine distal contact point by 3.5 ±3.6 mm on the left side and by 3.9 ±3.4 mm on the right side. In women, the A line was situated between the canine cusp tip and distal contact point. It was mesial to the distal contact point by 2.0 ±2.0 mm on the left side and by 1.8 ±2.0 mm on the right side. The IA line was distal to the canine distal contact point by 1.2 ±2.6 mm on the left side and by 1.6 ±2.7 mm on the right side. ConclusionsThe interalar width is greater than the intercanine distance in both sexes. The A line is more clinically relevant than the IA line for predicting canine position. The A line can directly determine the distal contact point of the canine in edentulous male patients. However, in women, a distance of approximately 2 mm should be added distal to the A line to locate the distal contact point of the canine on both sides.

The effect of subspinal Le Fort I osteotomy and alar cinch suture on nasal widening

The aim of this retrospective study was to evaluate the relationships between upper jaw movements and nasal soft-tissue changes in patients who have undergone subspinal Le Fort I osteotomy combined with alar cinch suture.Single and multivariate linear regression analyses were used to examine the relationships between greatest inter-alar width (GAW) and maxillary advancement, maxillary impaction, and rotational movements. The database of our referral hospital was searched for patients who had undergone upper jaw surgery with a subspinal LFI osteotomy to correct dentoskeletal deformities between April 2012 and June 2016.Thirty-eight of the patients (15 men and 23 women) who were identified were eligible for inclusion. The average change in inter-alar width (ΔGAW) was +1.7 ± 1.2 mm. GAW increased by 0.3 mm (p < 0.0001) for each millimetre of maxillary advancement, and increased by 0.5 mm (p < 0.0001) for each millimetre of maxillary impaction. GAW increased by 0.2 mm for each degree of counterclockwise rotation of the occlusal plane (p < 0.0001).An analysis of our data compared with the current literature confirmed that subspinal Le Fort I combined with alar cinch suture reduced alar base widening.

Predicción del ancho mesiodistal de dientes anterosuperiores a partir del ancho interalar nasal en individuos peruanos con armonía facial

Objective: To determine regression models to predict the mesiodistal widths of the maxillary anterior teeth from interalar width of the nose in subjects with facial harmony. Materials and Methods: A cross-sectional study was carried out in a sample of 75 subjects with facial harmony and ages ranging from 18 to 30 years (21.28±3.75 years). The mesiodistal width of the central (CI), lateral (LI) incisors, and canines (C), as well as the interalar width (IW) of each subject were measured using a digital vernier caliper. Simple linear regression analyses were used to predict the width of the maxillary anterior teeth from the nasal interalar width, from which formulas for predicting the dimensions of each anterior tooth were obtained. Results: A statistically significant relationship was found between the nasal interalar width and the mesiodistal widths of the upper central incisor (p=0.019, R2=5.23%), upper lateral incisor (p=0.019, R2=2.31%), and upper canine (p=0.016, R2=12.04%) that allowed to develop simple linear prediction models for each tooth represented by the following formulas: CI=7.04+0.04(IW); LI=6.01+0.03 (IW); C=6.19+0.05 (IW). Conclusion: The nasal interalar width is a good predictor of the mesiodistal widths of the maxillary anterior teeth.

Implementation of Anthropometric Measurements in Anterior Teeth Selection in Two Ethnic Groups: An In Vivo Study.

ABSTRACTAim:The aim of this study was to evaluate whether there is any consistent relationship between interalar distance and six maxillary anterior teeth in two ethnic groups.Materials and Methods:Two hundred subjects (Assamese 100 and Nyishi 100) of different age and sex ranging from 18 to 33 years were identified for this study. The distance between two widest points marked on the alae of nose was measured by means of sliding digital caliper. Statistical analysis of variance was the testing method to determine whether the nasal width and intercanine distance were different in various racial groups.Results:The mean nasal width dimension in Assamese group was 36.38 mm (range 28.55–50.00 mm). The mean nasal width dimension in Nyishi group was 35.73 mm (range 31.34–41.90 mm). For the nasal width, no significant difference was observed between two races. For the canine cusp tip to cusp tip distance, the mean value of Assamese subjects was 43.63 mm (range 39.02–50.02 mm), whereas the Nyishi presented 41.77 mm (range 36.69–47.05 mm).Conclusion:For the two racial groups studied, the measurements of the interalar width showed a weak correlation with the canine to canine distance, not sufficiently high to be used as a predictive factor. It suggests to select wider artificial teeth. Practitioners can use ethnic norms as guides, not absolute values.