The Effect of Shovel Trait on Carabelli's Trait in Taiwan Chinese and Aboriginal Populations

Hsu, John W.; Tsai, Ping-Huei; Hsiao, Tin H.; Chang, Hong Po; Liu, Lin; Liu, Keh M.; Yu, Hsin Su; Ferguson, Donald J.

doi:10.1520/jfs14211j

Cited by 14 publications

(15 citation statements)

References 16 publications

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“…We found that the mesiodistal and buccolingual crown diameters of first molars were larger on average in those individuals who displayed Carabelli trait than in those who did not, a result consistent with many former studies (De Terra, 1905;Broekman, 1938;Keene, 1968;Sasaki, 1968;Lombardi, 1975;Noss et al, 1983;Hsu et al, 1997). Furthermore, cusp areas were larger in cuspal forms than in noncuspal forms, a trend that was particularly evident in the hypocone.…”

Section: Discussionsupporting

confidence: 91%

“…Some studies included both metric and nonmetric data to make comparisons within and between populations, and some looked at the interactions or associations between these variables (Garn et al, 1966;Keene, 1968;Sasaki, 1968;Bang and Hasund, 1972;Lombardi, 1975;Noss et al, 1983;Reid et al, 1991Reid et al, , 1992Hsu et al, 1997). More recently, researchers began analyzing intracoronal components, e.g., cusp areas and intercuspal distances, which are thought to provide a better biological basis for describing tooth size variation (e.g., Biggerstaff, 1969;Corruccini, 1979;Townsend et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Associations between Carabelli trait and cusp areas in human permanent maxillary first molars

Kondo

Townsend

2005

American J Phys Anthropol

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Few dental anthropological studies have investigated the associations between tooth crown size and crown traits in humans using quantitative methods. We tested several hypotheses about overall crown size, individual cusp areas, and expression of Carabelli cusps in human permanent first molars by obtaining data from standardized occlusal photographs of 308 Australians of European descent (171 males and 137 females). Specifically, we aimed to calculate the areas of the four main molar cusps, and also Carabelli cusp, and to compare the relative variability of cusp areas in relation to timing of development. We also aimed to compare cusp areas between males and females and to describe how Carabelli cusp interacted with other molar cusps. Measurements included maximum crown diameters (mesiodistal and buccolingual crown diameters), the areas of the four main cusps, and the area of Carabelli cusp. The pattern of relative variability in absolute areas of molar cusps corresponded with their order of formation, the first-forming paracone displaying the least variation, and the last-forming Carabelli cusp showing the greatest. Overall crown size and areas of individual cusps all showed sexual dimorphism, with values in males exceeding those in females. Sexual dimorphism was smallest for paracone area and greatest for Carabelli cusp area. Overall crown size and cusp areas were larger in individuals displaying a Carabelli cusp, especially the hypocone area. Although the combined area of the protocone and a Carabelli cusp was greater in cuspal forms than noncuspal forms, protocone area alone was significantly smaller in the former. Our findings lead us to propose that, in individuals with the genotype for Carabelli trait expression, larger molar crowns are more likely to display Carabelli cusps, whereas molars with smaller crowns are more likely to display reduced forms of expression of the trait. We suggest that the pattern of folding of the internal enamel epithelium in developing molar crowns, particularly in the protocone region, can be modified by a developing Carabelli cusp.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Associations between Carabelli trait and cusp areas in human permanent maxillary first molars

Kondo

Townsend

2005

American J Phys Anthropol

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“…Sexual dimorphism in the expression of Carabelli's trait has been reported previously,[91923334053] but some authors found no significant difference in representation as observed in the present study. [21455455] Though there was no statistically significant difference, we observed that the expression of positive trait is more among males [28.6%] when compared to females [20.3%], in primary second molars.…”

Section: Discussionsupporting

confidence: 55%

“…[3233] Among the Caucasians, it is assumed that the Asiatic and Asiatic derived population show low trait frequencies, whereas, European population show high trait frequencies. [2735] Racial type of India seems to a complicated mixture of all major types.…”

Section: Discussionmentioning

confidence: 99%

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

Kamatham¹,

Nuvvula²

2014

J Forensic Dent Sci

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Background:The distribution of the Carabelli trait is highly variable in different regions and races of the world.Objective:To determine the prevalence of Carabelli trait in a group of children from Nellore.Materials and Methods:Children who attended the department between October 2011 to March 2012 were selected and examined for the expression of Carabelli trait in the maxillary primary second molar, permanent first and permanent second molars on the basis of the classification developed by Kraus and standards developed by Dahlberg.Statistical Methods:Descriptive statistics was performed and the relative frequency of expression in each category, according to Kraus's and Dahlberg's classification was calculated. Sexual dimorphism was statistically analyzed using Mann-Whitney U-test.Results:A total of 89.8% of primary second molars, 63.7% of permanent first molars, and 8% of permanent second molars showed some form of expression of Carabelli trait in the target population.Conclusion:Though there was a high frequency of intermediate expressions of this trait, occurrence of a definite cusp of Carabelli on the primary maxillary second molar and permanent maxillary first molar was relatively infrequent. A high percentage of the permanent maxillary second molars showed complete absence of Carabelli trait and there was no sexual dimorphism. Bilateralism with varying degrees of asymmetry was noted and there was tendency for concordance between the two sides but not within individual sides.

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“…[17][18][19][20][21][22] The determination of sex and ancestry can be assessed from skull shape and form. Generally, from skull appearance, forensic dentists can determine race within the three major groups: Caucasoid, Mongoloid and Negroid.…”

Section: Other Methods Of Dental Identificationmentioning

confidence: 99%

A look at forensic dentistry – Part 1: The role of teeth in the determination of human identity

Pretty¹,

Sweet²

2001

Br Dent J

108

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The Effect of Shovel Trait on Carabelli's Trait in Taiwan Chinese and Aboriginal Populations

Cited by 14 publications

References 16 publications

Associations between Carabelli trait and cusp areas in human permanent maxillary first molars

Associations between Carabelli trait and cusp areas in human permanent maxillary first molars

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

A look at forensic dentistry – Part 1: The role of teeth in the determination of human identity

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