Nonmetric traits of permanent posterior teeth in Kerala population: A forensic overview

Baby, Tibin K; Sunil, S; Babu, Sharlene Sara

doi:10.4103/jomfp.jomfp_21_17

Cited by 10 publications

(12 citation statements)

References 16 publications

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“…The characteristics of nonmetric traits are primarily used to predict human identity, gender, and origin [ 14 ], although as confirmed in this study, few nonmetric traits might have sex dimorphism [ 27 ]. It seems that the nonmetric properties of tooth crowns rarely have gender differences.…”

Section: Discussionmentioning

confidence: 95%

“…These characteristics also play a critical role in racial and legal identification. So far, over 135 dental features have been identified in the human dental system, but few have been studied in global research [ 14 ] on dental casts, direct clinical evaluation, radiography, and digital photography [ 14 , 28 ]. The characteristics of nonmetric traits are easily observed and recorded, so they provide us with information about genetic and ethnical variations that occur, to organize populations according to the group-specific evolution process [ 12 ].…”

Section: Discussionmentioning

confidence: 99%

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Associations between 44 nonmetric permanent dental traits or anomalies with skeletal sagittal malocclusions and sex, besides correlations across the variations or abnormalities

2022

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Introduction Nonmetric dental traits and the shape, size, or number of dental anomalies are essential to various dental fields such as orthodontics, dental anatomy, anthropology, pathology, and forensic dentistry. Nonetheless, many are not well assessed worldwide. Moreover, most studies are limited to a few nonmetric traits. Therefore, we aimed to examine several nonmetric dental traits/anomalies. Methods In this cross-sectional epidemiological study, ~ 9000 permanent teeth of 331 non-syndromic orthodontic patients (radiographs and dental casts) with fully erupted permanent dentitions (except the third molars and some cases of a few teeth missing or excluded) were evaluated by two observers, each twice, in search for 62 nonmetric traits/shape-number-size anomalies. The traits/anomalies of interest were supernumerary, microdontia, peg-shaped lateral, shovelings, talon cusps, Carabelli cusps, fifth/sixth/seventh cusps on the molars, hypocone/hypoconulid absence, protostylid, deflecting wrinkle‏s, canine mesial ridge, distal trigonid crest, canine distal accessory ridge, accessory cusps in the mesial/distal marginal ridges, mesial/distal accessory ridges, and accessory cusps in the lingual of the mandibular premolars and second molars). Data, at both patient/quarter levels, were analyzed regarding the associated factors (skeletal Angle classes, crowding, sex, and sides) as well as the correlations among traits, using the chi-square test and Spearman correlation coefficient (α = 0.05). Results Prevalence rates of 44 traits/anomalies were reported (18 out of the 62 searched traits/anomalies were not found [prevalence = 0%]). Microdontia and accessory cusps on the marginal ridge of the second mandibular molars were significantly more common in women (P < 0.05). Canine talon cusp and distal trigonid crest of the second mandibular molars were more prevalent in men (P < 0.05). Shoveling, canine talon cusp, canine distal accessory ridge, and accessory cusp in the first premolar might be more prevalent in skeletal Angle class II; whereas, accessory cusp in the mesial marginal ridge of the second premolar might be rather more prevalent in skeletal Angle class I (P < 0.05). Few dental traits were positively and moderately or strongly correlated with each other (Spearman Rho ≥ 0.4, P < 0.0005). Conclusions Sex dimorphism was uncommon in nonmetric dental traits/anomalies. Skeletal malocclusions may be associated with a few dental abnormalities or variations.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Associations between 44 nonmetric permanent dental traits or anomalies with skeletal sagittal malocclusions and sex, besides correlations across the variations or abnormalities

2022

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“…Information on age, sex, and type of the skeletal Angle classification was recorded from the patients' files and their cephalographs. Data collection was performed from 2018 to 2020 [ 30 , 31 ].…”

Section: Methodsmentioning

confidence: 99%

Buccolingual and Mesiodistal Dimensions of the Permanent Teeth, Their Diagnostic Value for Sex Identification, and Bolton Indices

Rakhshan

Ghorbanyjavadpour

Ashoori

2022

BioMed Research International

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Introduction. We aimed (1) to measure the mesiodistal and buccolingual widths of the permanent dentition in Iranian orthodontic patients, (2) to determine cut-off points for sex identification based on the mesiodistal and buccolingual diameters, and (3) to calculate Bolton indices. Methods. The mesiodistal and buccolingual dimensions of 28 maxillary and mandibular permanent teeth in 331 Iranian nonsyndromic orthodontic patients (dental casts and radiographs) aged 12 to 35 years old with fully erupted permanent dentitions (except the third molars and some sporadic cases of a few teeth missing or excluded) were measured. The anterior, posterior, and overall Bolton ratios were calculated in cases with no missing teeth in the 6-to-6 range. Potentially associated factors (the skeletal Angle classes, crowding, sex, jaws, sides, and age), as well as the value of these measurements for sex determination and cut-off points for sex identification based on these measurements were assessed using receiver-operator characteristic (ROC) curves, analysis of variance (ANOVA), Tukey, unpaired t -test, partial and Pearson correlation coefficients, and multiple linear regression ( α = 0.05 ). Results. Sex dimorphism was very frequent ( P ≤ 0.05 in 41 out of 56 measurements). Only the buccolingual widths of the maxillary lateral and the mandibular central and lateral differed across the Angle classes (ANOVA/Tukey, P < 0.05 ). Cut-off points were estimated for 38 dental measurements, which were proper for sex identification ( P < 0.05 ), with 8 (2 maxillary and 6 mandibular) measurements being highly appropriate (having areas under ROC curves ≥ 64 % , P < 0.05 ). Both the mandibular canines were the only teeth with all four measurements highly appropriate for this purpose. Controlling for the role of sex, aging was associated negatively with several crown dimensions (the buccolingual widths of the maxillary first and second premolar and mandibular second premolar and first molar; the mesiodistal diameters of the maxillary central, canine, first premolar, and first molar, mandibular central, lateral, first premolar, and first molar, P ≤ 0.05 , partial correlation coefficient). There were significant correlations among crown sizes. All the 28 (right/left-averaged) measurements were smaller in microdontia cases ( P ≤ 0.002 ). The anterior, posterior, and overall Bolton indices were 78.05, 105.42, and 91.87, respectively. There were correlations between the overall Bolton ratio with the other two Bolton ratios (Pearson R = 0.696 , R = 0.740 , P < 0.0005 ) but not between the anterior and posterior Bolton ratios ( R = 0.045 , P = 0.459 ). The skeletal Angle classes might not be associated with the overall and anterior Bolton ratios (ANOVA, regression, Pearson, P > 0.05 ). However, the posterior Bolton ratio was smaller in class II cases compared to classes I or III (Tukey, P ≤ 0.045 ). In the whole sample, there was no sex dimorphism in Bolton ratios ( t -test, P > 0.05 ). However, in Angle class II patients, the anterior Bolton ratio was greater in men than in women ( P = 0.014 ). Conclusions. Sex dimorphism might be very common in the dentition of Iranians, with aging significantly reducing some measurements. The buccolingual widths of some incisors might differ across the skeletal Angle classes. Mandibular canines are the most appropriate teeth for sex identification. The Angle classes might not be associated with the anterior and overall Bolton ratios; nevertheless, the posterior Bolton ratio might be smaller in class II cases compared to others. In general, sex might not affect Bolton ratios; however, in class II patients, the anterior Bolton ratios might be larger in men.

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“…Як показують дані літературних джерел, врахування антропологічних, анатомічних, одонтологічних ознак, що дозволяють встановити расові, етнічні, вікові, статеві критерії, а також генетичні зв'язки між різними расами, етнічними групами, ареалами, групами людей та ступінь їх родинних зв'язків мають не лише наукову, але й практичну цінність та експертне значення. [3,4,5]. За даними антропологічної науки судово-медичні експертипрактики прирівнюють варіанти індивідуального одонтогліфічного малюнку зубів людини до індивідуального папілярного візерунку шкіри, тобто як критерій дерматогліфічного дослідження ідентифікаційних ознак для проведення дактилоскопії.…”

Section: судова медицинаunclassified

Using the Criteria of Individual Odontoglyphic Status in Carrying Out Forensic Medical Identification of an Unknown Person

Cherniak¹,

Nikiforov²,

Lucachina³

et al. 2020

Ukr. ž. med. bìol. sportu

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Nonmetric traits of permanent posterior teeth in Kerala population: A forensic overview

Cited by 10 publications

References 16 publications

Associations between 44 nonmetric permanent dental traits or anomalies with skeletal sagittal malocclusions and sex, besides correlations across the variations or abnormalities

Associations between 44 nonmetric permanent dental traits or anomalies with skeletal sagittal malocclusions and sex, besides correlations across the variations or abnormalities

Buccolingual and Mesiodistal Dimensions of the Permanent Teeth, Their Diagnostic Value for Sex Identification, and Bolton Indices

Using the Criteria of Individual Odontoglyphic Status in Carrying Out Forensic Medical Identification of an Unknown Person

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