Left Mandibular Teeth Research Articles

Applicability of Cameriere European formula for age estimation of 10-15 years legal threshold in South Indian population.

Aim:The aim of the present study is to assess the relationship between chronological age (CA) and the measurement of the open apices in teeth and also assess the accuracy of Cameriere methods on dental age (DA) estimation in the South Indian population.Subjects and Methods:A sample of 200 orthopantomographs of children aged between 10 and 15 years were collected. The seven left permanent mandibular teeth were evaluated with Cameriere method.Results:Regression analysis was carried out which derived the following linear regression formula: Age = 14.117 − 0.01 g − 1.732W3 + 0.016N0 − 0.289 × 5 − 0.099.s. N0. The equation explained 88.3% (R2 = 0.883) of the total deviance. The accuracy of the European formula and South Indian formula was determined by the difference between the estimated DA and CA. Cameriere formula produced 32% and 18% of absolute residuals falls within the range of ± 1 and ± 0.5 years, whereas the new regression formula produced 72% and 35% within range of ± 1 and ± 0.5 years.Conclusion:This further highlight the importance of population-specific formula keeping in mind about variation in dental maturation across different regions.

Dental Age Estimation in A Sample of Kurdish Subjects (Aged 9-15 Years Old) in Erbil City Adopting Demirjian Method A Radiographic Study

Background and objectives: Dental maturation is widely used to assess maturity and to predict age. Age estimation plays a great role in clinical dentistry, especially in orthodontics, pedodontics and forensic dentistry and aid in diagnosis and treatment planning. Demirjian method is one of a commonly used methods. The aim of this study was to find out the applicability of Demirjian's method for dental age estimation for Kurdish subjects in Erbil City.Methods: The study was conducted on orthopantomograms of 125 Kurdish subjects (65 males, 60 females) in Erbil City, their ages ranged between 9 to 15 years old. Demirjian method was used to assess dental age based on the degree of mineralization of the seven left mandibular teeth, and t-tests were used to assess the difference between dental age and chronological age. Results: A strong linear correlation between dental and chronological ages for both males and females were observed (r = 0.845, 0.893). The mean difference between the chronological and dental ages showed an overestimation of 0.18 and 0.56 years for males and females respectively. Conclusion: Demirjian's method of dental age estimation showed accuracy in most age groups (except in 9 and 12 age groups in females) in Kurdish subjects in Erbil City.

The timing of permanent tooth development in a Black Southern African population using the Demirjian method.

Many aspects of growth have been documented for Black Southern African children, yet their dental development has not been comprehensively investigated. The present study was designed to provide information on age of attainment of dental development stages in Southern African children and to compare the findings with other populations. This was a community-based cross-sectional study of 642 children (270 males and 372 females). Panoramic radiographs of children aged 5 to 20years were assessed using Demirjian's eight stages of permanent tooth formation and age was estimated using Demirjian's method. Resulting dental ages were compared to the chronological ages. Probit regression analysis was employed to calculate the mean age of attainment of the developmental stages for the seven left mandibular teeth. Maturity scores and age of attainment were compared by sex and with published data on other populations. Females show significantly advanced dental maturity and dental ages, as well as earlier attainment of all stages of mineralization, compared to males (p < 0.05). The Demirjian method overestimated dental age in both males (0.8 ± 1.02years) and females (1.0 ± 0.98years). Cross-population comparisons illustrate that Black Southern African children are generally advanced in dental maturity compared to children of European and Asian ancestry. The Demirjian method significantly overestimated the chronological ages of Black Southern African males and females. Southern Africans attain dental maturity earlier than South Korean, Canadian, and Belgian children. These differences in dental maturity clearly illustrate the need for population-specific, rather than global, dental maturity standards.

The role of accelerated dental development on the occurrence of aberrant dental traits that indicate malocclusion.

Timing of dental development might help orthodontists to optimize initiation of treatment and to prevent and intercept dental misalignment. This study examines the association between timing of dental development and aberrant dental traits such as crowding, impaction, and hypodontia. This study was performed using 4446 ten-year-old children from a multiethnic birth cohort, the Generation R Study. Dental development was defined using the Demirjian method. Crowding, impaction, and hypodontia were ascertained from 2D and 3D pictures and radiographs. We built three series of logistic regression models to test the associations of dental age with crowding, impaction, and hypodontia. Similar models were built to investigate the associations of the developmental stages of each left mandibular tooth with crowding, impaction, and hypodontia. Inverse associations were found between every 1-year increase in dental age and the presence of crowding [odds ratio (OR) = 0.84, 95% confidence interval (CI): 0.79, 0.89], impaction of teeth (OR = 0.66, 95% CI: 0.52, 0.84), and hypodontia (OR = 0.52, 95% CI: 0.47, 0.56). Lower developmental stages of the second premolar were associated with the presence of crowding (OR = 0.90, 95% CI: 0.83, 0.98). Lower developmental stages of the second premolar (OR = 0.88, 95% CI: 0.79, 0.98), first molar (OR = 0.76, 95% CI: 0.65, 0.90), and the second molar (OR = 0.83, 95% CI: 0.73, 0.94) were associated with the presence of tooth impaction. Lower developmental stages of all mandibular teeth except the central incisor were associated with hypodontia (P < 0.05). Accelerated dental development is associated with lower occurrence of crowding, impaction, and hypodontia.

Age estimation in 5–16-year-old children by measurement of open apices: North German formula

The aims of this study were to test the accuracy of Cameriere et al.’s European formula on a sample of North German children based on dental age (DA) for chronological age (CA) assessment and to adapt the formula used, in case of regional peculiarities of this group of children.Orthopantomograms of 1000 children (444 males and 556 females) aged 5–16years were used. The roots of seven left mandibular teeth were evaluated. The number of teeth with complete root development (N zero (0)) was counted. Teeth with incomplete root development were examined and the distance between the inner sides of the open apex was measured and normalized by dividing it by the tooth length to avoid error due to magnification. Cameriere et al.’s European formula underestimated the mean CA of boys by 0.56±1.04years and of girls by −0.32±0.96.The results of the regression analysis showed that sex (g), the sum of normalized open apices (s), number of teeth with closed apices (N0) and the first-order interaction between the normalized apex width of the canine (x3) and N0 contributed significantly to the fit. All previously mentioned factors were included in the regression model, yielding to the following formula:DA=9.829+0.632 N0−1.037s+0.686g−1.582N0×x3,where g is a variable: 1 for males and 0 for females.The adapted formula explained 84.1% of the total deviance, with a median age of 0.070 years and 1.185 years interquartile range, (IQR).

Accuracy of estimating age from eruption levels of mandibular teeth

Little is documented on the accu-racy of estimating age from alveolar eruption (AE) or partial eruption (PE). The aim of this study was to compare the accuracy of age estimation from eruption levels. Methods tested were Gleiser and Hunt (1955), Garn et al. (1958), Ando et al. (1965), Haavikko (1970) and clinical eruption from Smith et al. (1998). The sample was 946 panoramic dental radiographs from children aged 3-16 years. Left mandibular teeth (excluding third molar) were assessed for eruption level (AE and PE) and root quarters. Methods, teeth and eruption levels were deemed to be accurate if the average difference between estimated and chronological ages was not significant to zero using a t-test (P&gt;0.05). Results show that early erupting permanent teeth were fairly good at estimating age, although there was considerable age variation in eruption. Haavikko incisors and molars at AE and Haavikko and Smith central incisor and second molar at PE estimated age accurately. Root stage of erupting teeth estimated age more accurately than eruption level using Haavikko. These findings suggest that erupting permanent mandibular teeth can be helpful in estimating age.

Dental age estimation in Somali children using the Willems et al. model.

The aim of the current study was to retrospectively collect dental panoramic radiographs from Somali children living in Finland, to use the radiographic data to develop a new age estimation model based on the model established by Willems et al. (J Forensic Sci 46(4):893-895, 2001), and to compare the age prediction performances of the Willems et al. model (WM) and the newly developed model. Dental panoramic radiographs from 808 healthy Somalis born in Finland were selected. The development of the seven left mandibular permanent teeth, from the central incisor to the second molar, was staged according to Demirjian et al. (Hum Biol 45(2):211-227, 1973). Radiographs with all listed permanent teeth completely developed were excluded. The studied sample consisted of 635 subjects (311 females, 324 males) ranging in age from 4 to 18years. Kappa and weighted Kappa statistics were used to quantify intra- and inter-observer agreement in stage allocation. The collected dataset was used to validate the WM, constructed on a Belgian Caucasian reference sample, and to establish a Somali-specific age estimation model (SM) based on the WM. Both models were validated and their age prediction performances quantified using mean error (ME), mean absolute error (MAE) and root mean squared error (RMSE). The SM resulted in a slight underestimation of age when the sex groups were analysed separately or combined, with ME varying between 0.04 (standard deviation (SD) 1.01) and 0.05 (SD 1.04) years, MAE between 0.77 and 0.80years and RMSE between 1.01 and 1.04years. The WM statistically significantly underestimated the age of females, with an ME of 0.20 (SD 1.01) years (p = 0.0006). For males, and for females and males combined, no statistically significant ME was observed. The WM and SM were similar in their age prediction performances, and the use of the WM in dental age assessment in the Somali population is justified.

Does dental caries affect dental development in children and adolescents?

Although a link between dietary changes, caries, and dental development has been observed, the literature provides little insight about this relationship. The aim of our study was to investigate the association between dental caries and dental development in a clinical sample of Albanian children and adolescents. In total, 118 children and adolescents, born between 1995 and 2004 and aged 6-15 years, were included. Dental caries in the deciduous dentition was assessed using the Decayed, Filled Teeth (dft) index and dental caries in the permanent dentition was assessed using the Decayed, Missing, Filled Teeth (DMFT) index. Dental development during the permanent dentition was determined using the Demirjian method. Linear and ordinal regression models were applied to analyze the associations of dental caries with dental age and developmental stages of each left mandibular tooth. Dental caries in the deciduous dentition, estimated as a median dft of 2.0 (90% range, 0.0-9.1), was significantly associated with lower dental age (β = -0.21; 90% CI: -0.29, -0.12) and with delayed development of the canine, both premolars, and the second molar. Untreated dental caries (dt) was associated with lower dental age (β = -0.19; 90% CI: -0.28, -0.10). Dental caries in the permanent dentition, estimated as a median DMFT of 1.0 (90% range, 0.0-8.0), was not significantly associated with dental age (β = 0.05; 90% CI: -0.04, 0.14). However, the DMFT was associated with the advanced stages of development of both premolars and the second molar. The untreated dental caries in the deciduous dentition delays the development of permanent teeth.

A Novel Idea in the Use of Ultrasound to Guide Nasolabial Hyaluronic Acid (HA) Dermal Filler Injections to Prevent Alar Nasal Necrosis

BackgroundNasolabial dermal filler (DF) injections are one of the most popular cosmetic procedures performed worldwide. DF injections at the nasolabial fold have been associated with nasal necrosis due to inadvertent intravascular injection of the adjacent facial artery (FA). Current DF injection protocols are devoid of imaging the anatomical site, and the use of ultrasound (US) for imaging the FA is very limited in literature. The purpose of this study is to determine the feasibility of utilizing US to identify and measure the FA at different bony landmarks near and within the nasolabial region.MethodsPart ICadaveric dissections (n=18; 10 female, 8 male) will be completed to explore the course of the FA from the external carotid artery to the terminal branches supplying facial structures.Part IIA bilateral US of the FA using 13–6 MHz, 38 mm linear array US transducer was performed on consenting adults (n=16; 9 female, 7 male) from the Department of Anatomy and Cell Biology at Western University. The following bony landmarks were identified and used for US measurements, taken in real time: anterior‐inferior angle of the mandible, mandibular teeth, maxillary teeth, maxillary ridge. Measurements of FA diameter, artery distance to skin, and artery distance to bone were obtained at each landmark using digital image distance measurements on the Sonosite M‐Turbo P08189‐88R US machine.ResultsPart IPreliminary results (n=8; 4 female, 4 male) show FA variability between cadaveric specimens, as well as left/right FA variability within cadaveric specimens themselves.Part IIPreliminary results of the average FA distance to the skin measured at 0.438 cm ± 0.126 for the left FA and 0.459 cm ± 0.205 for the right FA. A significant difference (P&lt; 0.05) was noted for FA distance to the skin between the left mandibular teeth (0.481 cm ± 0.107) and left maxillary ridge (0.343 cm ± 0.097).ConclusionsThese findings highlight the importance of understanding the anatomy of the FA within the nasolabial fold, and the need to carefully personalize the placement of DF injections, due to the anatomical variability identified in both the cadaveric and ultrasound portions of the study. Furthermore, since it is feasible to identify and measure the FA using the selected US transducer, the future direction of this study will be to examine the application of US to guide DF injections.This abstract is from the Experimental Biology 2018 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.

TRISMUS

Objectives: To compare trismus in surgical removal of impacted mandibularthird molar using comma incision and standard Wards incision. Study Design: Cross sectionalstudy. Setting: Dental OPD of Isra Dental College, Isra University. Period: 1st January to 30thJune 2016. Materials and Methods: A sample of 50 patients of impacted third molar wasselected by non-probability purposive sampling for tooth extraction either by conventionaltechnique or by coma shaped incision at the Department of Oral surgery, Isra Dental CollegeHospital. Patients were selected according to inclusion and exclusion criteria. Post-operativemeasurement of trismus was measured on 1st, 3rd and 7th day respectively. Results: Mean ±SD age in group A and B was noted as 28.5 ± 4.32 and 27.2 ± 4.39 years respectively. Maleand female in groups A and B were noted as 16 (64%) and 9 (36%), &amp; 14 (56%) and 11 (44%)respectively. Right and left lower mandibular teeth extraction in groups A and B were noted 11and 14, &amp; 10 and 15 respectively. Trismus was measured preoperatively and subsequently atday 1, day 3 and day 7. Conclusion: In conclusion, the Coma incision was preferable over theconventional method- the standard Ward`s incision because of lesser degree of trismus seen.Further research with newer flap designs and the comma design should be preferred by theclinicians for the extraction of impacted third molar surgery.

COMPARISON AFTER REMOVAL OF IMPACTED THIRD MOLAR IN PATIENTS VISITING ORAL SURGERY DEPARTMENT IN HYDERABAD

Objectives: To compare trismus in surgical removal of impacted mandibularthird molar using comma incision and standard Wards incision. Study Design: Cross sectionalstudy. Setting: Dental OPD of Isra Dental College, Isra University. Period: 1st January to 30thJune 2016. Materials and Methods: A sample of 50 patients of impacted third molar wasselected by non-probability purposive sampling for tooth extraction either by conventionaltechnique or by coma shaped incision at the Department of Oral surgery, Isra Dental CollegeHospital. Patients were selected according to inclusion and exclusion criteria. Post-operativemeasurement of trismus was measured on 1st, 3rd and 7th day respectively. Results: Mean ±SD age in group A and B was noted as 28.5 ± 4.32 and 27.2 ± 4.39 years respectively. Maleand female in groups A and B were noted as 16 (64%) and 9 (36%), &amp; 14 (56%) and 11 (44%)respectively. Right and left lower mandibular teeth extraction in groups A and B were noted 11and 14, &amp; 10 and 15 respectively. Trismus was measured preoperatively and subsequently atday 1, day 3 and day 7. Conclusion: In conclusion, the Coma incision was preferable over theconventional method- the standard Ward`s incision because of lesser degree of trismus seen.Further research with newer flap designs and the comma design should be preferred by theclinicians for the extraction of impacted third molar surgery.

Accuracy of the Demirjian and Willems methods of age estimation in a Black Southern African population

The accuracies of the original Demirjian, modified Demirjian and Willems dental age estimation methods were compared for a Black Southern African population to determine their usefulness for forensic and anthropological purposes. Data were collected using a community-based prospective study design. Panoramic radiographs of seven left mandibular teeth from 540 children aged 5-15.99 years were scored using the three methods. Obtained estimates were compared to the chronological ages and mean absolute errors were calculated. The original Demirjian method significantly overestimated ages (males 0.85 years, female 1.0 years; mean absolute errors of 1.1 years for both sexes), as did the modified Demirjian method (males 0.90 years, females 1.21 years; mean absolute errors of males 1.1 years, females 1.4 years). The Willems method was the most accurate for Black Southern Africans, with the lowest significant mean difference (males 0.2 years, females 0.3 years) between dental and chronological age, with the least mean absolute errors (males 0.70 years, females 0.68 years).

Clinical evaluation of two bleaching regimens

Objectives Evaluate the color regression, postoperative sensitivity, and patient's satisfaction after bleaching with different regimens over a period of 1 year clinical service. Participants and methods Twenty highly educated adolescents (age range: 18–25 years) seeking for better esthetics were enrolled into the study. Their teeth shade was A3 or darker. Participants were enrolled in a split mouth study design divided into four groups according to bleaching materials and/or desensitizer used. Groupgroup I: right mandibular anterior teeth will receive over-the-counter (OTC) bleaching material followed by desensitizer application. Group II: left mandibular anterior teeth will receive OTC bleaching material. Group III: right maxillary anterior teeth will receive in-office bleaching material followed by desensitizer usage. Group IV: left maxillary anterior teeth will receive in-office bleaching material. The color change, teeth sensitivity and patient's satisfaction were recorded along the evaluation periods at baseline, before any treatment, directly after bleaching, and in 3 months intervals for a year postoperatively. Results One-way repeated measure analysis of variance test was performed to investigate the effect of time on the color change for each tested group. A highly significant difference was recorded regarding the color change for all tested groups with P value equals 0.000. Considerable postoperative sensitivity was recorded in 13.3, 36.7, 1.7, and 30% for group I, II, III, IV, respectively. Treatments were generally well-tolerated, a percentage of zero (n = 0) patient terminated the treatment prematurely. There was no postoperative hypersensitivity at any tooth after 3, 6, 9, and 12 months evaluation periods. Additionally, after 1 year evaluation periods, five (25%) patients recorded moderately satisfaction, nine (45%) patients were satisfied, and six (30%) patients were extremely satisfied with their teeth color. Conclusion and recommendations The degree of whitening is superior in the power bleaching compared with the OTC bleaching technique. The higher incidence of tooth sensitivity was found in teeth bleached using OTC technique. It is recommended that over-the-counter products should be used under strict manufacturer's directions.

Multidisciplinary prognostic transition of a molar tooth for long-term survival

Patients with periodontitis may have one or few teeth with hopeless prognosis, which would have to be extracted before initiation of orthodontic therapy. Periodontal therapy aims to prolong the lifespan of dentition, as preserving natural dentition is always the best treatment option. The decision to retain a tooth is always based on the probability of long-term success of one or more treatment modality. A 17-year-old female patient seeking fixed orthodontic treatment presented with the left mandibular first molar tooth (36) having hopeless periodontal prognosis with advanced primary periodontal and secondary endodontic lesion, grade III mobility, and grade II furcation involvement. Root canal treatment followed by periodontal surgery using a combination of bone graft (allograft) and platelet-rich fibrin membrane resulted in a clinical and radiographic indication of periodontal healing. The tooth (36) was even used for orthodontic anchorage 3-month postsurgically and was maintained for 2 years. Appropriate diagnosis and meticulous multidisciplinary treatment approach can lead to the restoration of health and function of the teeth with severe loss of attachment and bone loss and can even be used for orthodontic anchorage.

THE ANALYSIS OF MANDIBULAR TRABECULAE ALVEOLAR PROCESS ON POST-MENOPAUSAL WOMEN THROUGH PANORAMIC RADIOGRAPH

The alveolar process is the most supporting tooth containing trabeculae and has the highest metabolic rate in the mandibular body of post-menopausal women. The decreasing in estrogens level on post-menopausal women results a faster reaction than men for 2-3 times. This research aims to determine the bone quality based on trabeculae alveolar process analysis using panoramic radiographs. The research methodology was to conduct 67 samples of panoramic radiographs from RSGM Unpad. This research applied observational analytic methodology by taking cross-sectional data using secondary data on three groups of bone quality based on measurement using DEXA t-score (normal, osteopenia and osteoporosis). The panoramic radiograph data processing was conducted with Image J software by separating the background and foreground (trabeculae). A focus of 30x30 mm ROI in the alveolar distal portion of the left and right mandibular second premolar teeth, and calculation of trabecular area. Result: average of normal trabecular area: 82.35%, osteopenia: 73.9% and osteoporosis: 68.7% respectively. The difference between normal and osteoporosis was discovered, but no difference was found between normal and osteopenia with p &lt;0.05. This research concludes that the region of interest trabecular of alveolar process with panoramic radiograph can be used to detect osteoporosis on post-menopausal women.

Age estimation by the Cameriere's normalized measurements (CNM) of the single permanent mandibular tooth on a panoramic radiograph.

In this study Cameriere's normalized measurements (CNM) of a single mandibular tooth were evaluated for age estimation on a sample of ortopantomographies (OPTs) of 2223 Italian children aged between 4 and 15years. Dental maturity was radiographically evaluated by CNM of the seven left permanent mandibular teeth (CNMi=Ai/Li, i=1,…,7); in monoradicular teeth, the distance (Ai, i=1,…,5) between the inner sides of the open apex was measured while in biradicular teeth (Ai, i=6, 7), the sum of the distances between the inner sides of the two open apices was calculated. Ai was normalized by the tooth length (Li, i=1,…,7). The intra- and inter-observer agreement of CNM measurements was almost perfect. Overall, analyzed mandibular teeth finished their development up to the age of 13, but the distribution of CNM varied among different locations. The final models included a tooth-specific CNM as the independent variable and explained from 76% (second molars) to 39% (first incisors) of the variance in chronological age. The bias and accuracy of these models, when applied to real-life data with no age limitation, were within acceptable range of differences in the forensic anthropology of children. Specifically, in all models mean of absolute differences between estimated and real age was within one year (0.67 for first incisors to 1.00 for canines). In conclusion this study showed that all mandibular teeth do not have equal applicability for age estimation suggesting that further evaluation on different samples is necessary to evaluate the usefulness of a single mandibular tooth for age estimation.

Radiological changes with magnetic resonance imaging and computed tomography after irradiating minipig mandibles: The role of T2-SPIR mixed signal intensities in the detection of osteoradionecrosis

PurposeRadiotherapy in the head and neck can induce several radiologically detectable changes in bone, osteoradionecrosis (ORN) among them. The purpose is to investigate radiological changes in mandibular bone after irradiation with various doses with and without surgery and to determine imaging characteristics of radiotherapy and ORN in an animal model. Materials and methodsSixteen Göttingen minipigs were divided into groups and were irradiated with two fractions with equivalent doses of 0, 25, 50 and 70 Gray. Thirteen weeks after irradiation, left mandibular teeth were removed and dental implants were placed. CT-scans and MR-imaging were made before irradiation and twenty-six weeks after. Alterations in the bony structures were recorded on CT-scan and MR-imaging and scored by two head-neck radiologists. ResultsIncreased signal changes on MR-imaging were associated with higher radiation doses. Two animals developed ORN clinically. Radiologically mixed signal intensities on T2-SPIR were seen. On CT-scans cortical destruction was found in three animals. Based on imaging, three animals were diagnosed with ORN. ConclusionIrradiation of minipig mandibles with various doses induced damages of the mandibular bone. Imaging with CT-scan and MR-imaging showed signal and structural changes that can be interpreted as prolonged and insufficient repair of radiation induced bone damages.

Radiographic evaluation of dental age maturity in 3-17-years-old saudi children as an indicator of chronological age.

OBJECTIVE:This study was aimed to evaluate the dental age in Saudi children from panoramic radiographs using the Demirjian method to estimate their chronological age.MATERIALS AND METHODS:This retrospective cross-sectional study consisted of 1902 panoramic radiographs of 955 boys and 947 girls between the ages of 3–17 years. All children were placed in the age group closest to their chronological age. The dental age was scored on all seven left mandibular teeth by calibrated examiners. Bivariate analyses using the t-test and Pearson correlation were performed.RESULTS:There was significant difference in both boys and girls in all the age groups between their chronological age and dental age. Even though there was a slight overestimation in boys in some age groups and slight underestimation in girls in some groups, correlation analysis showed that there was a highly significant correlation between the chronological age and dental age for both boys (r2 = 0.96, P < 0.001) and girls (r2 = 0.98, P < 0.001). Moreover, correlation analyses for each age group showed a significant correlation between the chronological age and the dental age, using the Demirjian method, in most age groups (P < 0.01). When comparing the maturation score between boys and girls, the Student's t-test showed that there were no statistical differences between boys and girls in most age groups.CONCLUSION:Saudi boys and girls living in the western region of Saudi Arabia exhibited similar pattern of dental development when compared to the Demirjian method. Hence, the Demirjian method could be used as reference in children from the western region of Saudi Arabia.

Assessment of Demirjian's 8-teeth technique of age estimation and Indian-specific formulas in an East Indian population: A cross-sectional study.

Background:The age of an individual can be assessed by a plethora of widely available tooth-based techniques, among which radiological methods prevail. The Demirjian's technique of age assessment based on tooth development stages has been extensively investigated in different populations of the world.Aim:The present study is to assess the applicability of Demirjian's modified 8-teeth technique in age estimation of population of East India (Odisha), utilizing Acharya's Indian-specific cubic functions.Materials and Methods:One hundred and six pretreatment orthodontic radiographs of patients in an age group of 7–23 years with representation from both genders were assessed for eight left mandibular teeth and scored as per the Demirjian's 9-stage criteria for teeth development stages. Age was calculated on the basis of Acharya's Indian formula. Statistical analysis was performed to compare the estimated and actual age. All data were analyzed using SPSS 20.0 (SPSS Inc., Chicago, Illinois, USA) and MS Excel Package.Results:The results revealed that the mean absolute error (MAE) in age estimation of the entire sample was 1.3 years with 50% of the cases having an error rate within ± 1 year. The MAE in males and females (7–16 years) was 1.8 and 1.5, respectively. Likewise, the MAE in males and females (16.1–23 years) was 1.1 and 1.3, respectively.Conclusion:The low error rate in estimating age justifies the application of this modified technique and Acharya's Indian formulas in the present East Indian population.

Linear regression formula to predict chronological age through digital orthopantomographs and canine pulp/tooth area ratio in Vidarbha population

Context: Age is one of the essential factors of forensic odontology and is essential in establishing the identity of an individual. Estimation of the human age is a procedure adopted by anthropologists, archaeologists, and forensic scientists. Aim: The aim of this study was to develop a method for estimating the chronological age in Vidarbha population based on the relationship between age and various morphological variables of left mandibular canine tooth as obtained using digital orthopantomographs (OPGs). Subjects and Methods: Digital OPG of 200 patients was selected, and radiographic images of the left mandibular canine in each case were processed using a computer-aided designing program AutoCAD-2008. Regression equations were developed to estimate age from morphological variables. Results: Kappa statistics showed that the intraexaminer agreement score (κ = 0.91) was without a significant error in terms of reproducibility. Pearson's correlation coefficients between observed age and predictive morphological variables in males, females, and in the total sample population were highly significant and inversely correlated for AR (pulp/tooth area ratio) and c (pulp/root width ratio at midroot level) (P