Sensibilidad y Especificidad Clínica del Indice Mandibular Canino y del Ancho Mesiodistal del Diente Canino Para Estimar el Sexo: Ajuste de un Modelo Predictivo / Clinical Sensitivity and Specificity of Mandibular Canine Index and Mesiodistal Canine Width to Estimate Sex: Adjustment of a Predictive Model

Los dientes son un excelente material de investigación en personas vivas y cadáveres, en el ámbito antropológico, genético, odontológico y forense, por sus características (dureza, resistencia al ataque químico, fuego y descomposición). El diente canino mandibular es el menos afectado por enfermedad periodontal, menos extraído, más resistente a traumas severos y el que presenta mayor dimorfismo sexual. Se puede usar para la estimación de sexo, calculando el Índice Mandibular Canino (IMC). El propósito de este estudio es determinar la certeza del IMC en la estimación de sexo respecto al ancho mesiodistal del canino. El estudio fue realizado en 150 sujetos (H:M= 65:85), entre 18­24 años. El ancho mesiodistal del canino y la distancia canina fueron medidos en los modelos obtenidos y el IMC fue calculado. Se calculó la sensibilidad y especificidad para cada uno de los índices en cuestión. El IMC tuvo una sensibilidad del 33,85 % y una especificidad de 75,29 % en la estimación de sexo. El ancho mesiodistal del canino tuvo una sensibilidad de 66,15 % y una especificidad de 84,71 %. El ancho mesiodistal del canino tiene mayor sensibilidad y especificidad que el IMC en la estimación médicolegal de sexo.

Teeth are an excellent research material in living persons and in corpses, in the anthropological, genetic, dental and forensic fields, because of their characteristics (hardness, resistance to chemical attack, fire and decay). Mandibular canine teeth are the least affected by periodontal disease, the least extracted teeth, are more resistant to severe trauma and have a greater sexual dimorphism. They can be used for sex estimation, through the Mandibular Canine Index (MCI). The purpose of this study is to determine the accuracy of the MCI in sex estimation, compared to the mesiodistal canine width method. The study was conducted on 150 subjects (M:F= 65:85), aged 18­24. The mesiodistal width of canine and the intercanine distance were measured on the obtained models, and the MCI was calculated. The sensitivity and specificity for each of the two indexes were also calculated. MCI had a sensitivity of 33.85% and a specificity of 75.29 % in sex estimation. The mesiodistal width of canine had a sensitivity of 66.15 % and a specificity of 84.71 %. The mesiodistal width of canine has a higher sensitivity and specificity than the MCI in the medicolegal estimation of sex.

Sexual Dimorphism Using Canine Width and Inter-Canine Distance in South Indian Population: A Cross Sectional Study.

Background: Teeth provide excellent materials for forensic investigations intended for sex identification as they are the hardest and chemically most stable tissues in the body. The aim of this study was to evaluate the existence of sexual dimorphism in maxillary and mandibular permanent canines and also to estimate the level of accuracy with which they could be used for sex determination. Methods: The study sample consisted of 300 healthy adult patients aged between 20-30 years. Using sliding vernier calliper and divider, the maxillary and mandibular inter-canine distances and mesio-distal widths (MD) of left and right permanent maxillary and mandibular canines were recorded. The data was then subjected to Student’s t-test. Results: Mandibular canine width (MnCW) in males was significantly higher as compared to females. The mesiodistal widths of all the canines (MxRC, MxLC, MnLC, MnRC) were significantly higher in males than in females. Both maxillary right as well as left canine index (MxRCI, MxLCI) was significantly higher in males than the females. Statistically significant difference between male and females subjects was not observed pertaining to Maxillary canine width (MxCW) and mandibular canine index (MnRCI, MnLCI). Sexual dimorphism was exhibited by two teeth: maxillary right canine (8.34%) and maxillary left canine (13.04%). Conclusion: We evaluated a simple and inexpensive linear method as canine measurement for sexual dimorphism. Maxillary canines (particularly, maxillary left canine) showed a greater percentage of sexual dimorphism. Thus, maxillary canines can be used as an adjunct along with other accepted procedures for sex determination.

Incisal and Dental Archwidths – Norms and Ratios

In the present study, one hundred sets of study casts of normal occlusion were obtained from Hyderabad population (50 males and 50 females) with age ranging from 13 to 18 years. The mesiodistal widths of incisors, the inter canine, inter premolar and inter molar widths of maxillary and mandibular arches were measured. The means and S.D. were calculated. Though the mean values in males were slightly more than in females, the differences were not statistically significant. The width ratios between upper and lower arches were calculated and these ratios were constant and stable statistically. Applying these norms clinically, it was possible to evaluate dental arch width, to locate the discrepancy in posterior crossbites and to plan treatment accordingly.

Study of mandibular canine teeth dimorphism in establishing sex identity in Gujarat region.

Mandibular canines exhibit the greatest sexual dimorphism amongst all teeth. The present study was performed on 368 healthy MBBS students of Medical College, Bhavnagar (216 males, 152 females) of 18 – 24 years with the aim to investigate whether any correlation existed between odontometric measures including mandibular canine index, and sex determination in the year of 2006. Mean value of intercanine distance was higher in males than females and the difference was statistically highly significant (p value<0.01). Comparison of mean values of left and right mandibular canine widths exhibited lesser values in females. The variation in right and left mandibular canine width between males and females was highly significant (p value<0.01). The right and left mandibular canine index (MCI) among genders showed significant difference. Our study conclusively establishes the existence of a definite statistically significant sexual dimorphism in mandibular canines and MCI.

Correlation of odontometric measures in sex determination.

Mandibular canines exhibit the greatest sexual dimorphism amongst all teeth. The present study was performed on 400 healthy volunteers (200 males, 200 females) of 17 - 21 years with the aim to investigate whether any correlation existed between odontometric measures including mandibular canine index, and sex determination. Mean value of intercanine distance was higher in males than females and the difference was statistically highly significant (p value<0.01). Comparison of mean values of left and right mandibular canine widths exhibited lesser values in females. The variation in right and left mandibular canine width between males and females was highly significant (p value<0.01). The right and left mandibular canine index (MCI) among genders showed no significant difference. A mesio-distal canine width greater than 7.3 mm was suggestive of male sex. Our study conclusively establishes the existence of a definite statistically significant sexual dimorphism in mandibular canines and that MCI is of limited value.