Correlations between deciduous and permanent tooth morphology in a European American sample

Abstract

The expression of dental morphological characteristics is partially genetically controlled, and is assumed to be similar in deciduous and permanent dentitions. However, there are few published data comparing normal morphological variation between the two dentitions in the same individual. For the current study, data were collected from European Americans (N = 54) whose teeth were cast both as children and adults. We observed 19 trait expressions in deciduous and permanent dentitions. Deciduous traits were scored based on Hanihara's and Sciulli's descriptions, while permanent teeth were scored using the ASU dental anthropology system. The two dentitions' scores were compared using Goodman-Kruskal's Gamma (gamma) in the original, commonly used systems as well as in a new, shared scale to which the scores were converted. Observations were also dichotomized in both formats and compared using tetrachoric correlation. We expected high correlations between the two dentitions and for both statistics to yield similar results. For the original scores, gamma correlations vary from -1.0 to 0.68; tetrachoric correlations vary from 0.04 to 0.67. For the shared scale scores, gamma correlations range from -1.0 to 1.0 and tetrachoric correlations range between -0.47 and 0.8. Several traits showed no correlation in either test. Overall, categorical data analysis returned more positive moderate to high correlations than tetrachoric correlation analysis, and shared scale tests resulted in more correlations than did tests of data in the original scoring systems. These results reflect differences in commonly used scoring systems, variation in rarely occurring traits, different strengths of trait expression, and complex genetic/environmental interactions.

Expression of Carabelli trait in children from Southern India - A cross sectional study

“…As the investigators did not use the same criteria, it is not possible to compare all the studies, but, we attempted a generalized correlation of the existing literature[1314151617181920212223242526272829303132333435363738394041] [Table 1]. …”

Cusp expression of protostylid in deciduous and permanent molars

“…[323546] However, it is important to have the dichotomous expression of the morphological trait according to the ASUDAS system in mind, as for instance, in the American populations, it has been evidenced that when the protostylid is present (Grade 0 ASUDAS) it can be in furrow expressions (Grade 2 and 3 ASUDAS), in furrow and blunt vertex expressions (Grades 4, 5, and 6 ASUDAS), and in cusps with a free apex expressions (Grade 7 ASUDAS); Thereupon, regardless of the furrow or cusp expression, the correlation is high. Likewise, a very peculiar situation occurs with the fossa or point P expression (Grade 1 ASUDAS), associated with the cervical fossa or foramen cecum of the permanent low molars'.…”

“From the mouth of a child”: dental attributes and health status during childhood in Mesolithic India

“…Deciduous dental asymmetry has been studied in Dominican mulatto and south Australian children (Townsend and GarciaGodoy, 1984;Townsend and Farmer, 1998). Correlation and discrimination of deciduous dental metrics and morphology have focused on European, American, and global samples (Harris and Lease, 2005;Lease and Sciulli, 2005;Edgar and Lease, 2007). Fused and double primary teeth have been reported in archaeological samples and living populations in India and elsewhere (Tasa, 1998;Tasa and Lukacs, 2001;Smith and Wojcinski, 2011).…”