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.

To evaluate the accuracy of various dental parameters used for the gender determination in Nagpur District population.

Context: Gender determination is considered an important step in reconstructing the biological profile of unknown individuals from the forensic context. Assessment of sex differences from human remains will be of immense help as it would narrow down fields of search to 50 %. Aims: To evaluate the accuracy of various dental parameters used for the gender determination. Settings and Design: The aim of the present study was to investigate the accuracy of various methods employed in gender determination or personal identification such as mesiodistal width of molars, mesiodistal width of canine, mandibular and maxillary canine index in age group of 15 to 65 years. Methods and Material: A total of 200 patients were selected comprising of both the genders in the age group of 15-65 years belonging to various parts of Nagpur. The mesiodistal crown width of mandibular and maxillary permanent molar and canine teeth and the intercanine distance was measured and the values were noted. Statistical analysis used: the data was analysed using SPSS 18 software. Results: The mean of mesio distal width of maxillary and mandibular molar in males and females is suggestive of gender dimorphism in maxillary molars which was statistically significant. The maxillary inter-canine distance was greater in males and was statistically significant. Conclusions: The dental parameters can be used as a tool for accurate gender determination in forensic investigations.

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.

Sex determination in north Indians using mandibular canine index.

Teeth are an excellent material in living and non-living populations for anthropological, genetic, odontologic and forensic investigations. Amongst all teeth, the mandibular canines are found to exhibit greatest sexual dimorphism. Rao et al (1989) used the mandibular canine index for sex determination and found it to give satisfactory results. Muller et al (2001) concluded that Rao et al’s method can only be used in case of correct lower anterior dental alignment and by using the standard mandibular canine index of the local population. The present study endeavors to establish the effectiveness of mandibular canine index in predicting sex in North Indian population taking correct dental alignment into consideration. It was seen that with the standard mandibular canine index, it was possible to detect sex in North Indian population to an extent as high as 75%. This study establishes the existence of a statistically significant sexual dimorphism in the morphometry of mandibular canines in North Indian population.