The cusp of Carabelli: Frequency, distribution and type in the Bengaluru population

Abstract

Aims: Detailed description and study of teeth traits could provide valuable information regarding phylogeny of man and distinctions between races and subraces. But morphological variations of the human dentition have not been utilized to their full potential by anthropologists concerned with patterns of human biological variation in Indian population. The aim of the present study is to detect the frequency and degree of expression of Carabelli's trait in Bengaluru population, this helps to develop a probabilistic model to distinguish individuals from specific human populations, particularly for forensic purposes. Materials and Methods: A total number 400of age and sex matched individuals from four different ethnic groups – Hindu, Islam, Christian and Iranians were examined clinically and study casts were made. Permanent maxillary first molars were examined for the expression of Carabelli's trait, Dahlberg classification system was used to score the trait on the teeth. The scores were recorded on Osteoware Dental Morphology software. The cast were examined by 2 observers independently to eliminate intra observer variation in interpretation and mean of 2 was taken for analysis. The data so obtained was statistically analysed especially emphasizing on differences between above mentioned 4 ethnic groups. Results: Cusp of Carabelli was present in 87% of the study population in maxillary first permanent molar. Type 3 was the most frequently expressed and Type 6 was the least frequently expressed and both type being expressed in Islamic groups. The expression of trait was bilateral in 90% of the surveyed groups. Conclusions: It was concluded that the prevalence of cusp of Carabelli in the small population from Bengaluru considered in the present study was found to possess a high degree of Carabelli trait expression.

Carabelli Trait in Primary Tooth - A Case Report

“…As per the study conducted by Smita et al ,[ 10 ] Type 3 (Dahlberg classification) was the one that was most frequently expressed, while Type 6 was least frequently expressed and both the types were expressed in Islamic groups. In 90% of the groups surveyed, bilateral trait expression was noted.…”

“…[ 9 ] This is because size and shape of the tooth, number of tooth, frequency of occurrence, and their morphology have a strong genetic basis and can be used as variables to have a deeper insight into microevolutionary trends and to assess biological relationships. [ 10 ]…”

Đặc Điểm Carabelli Trên Răng Cối Lớn Thứ Nhất Và Thứ Hai Hàm Trên Ở Sinh Viên Răng Hàm Mặt Trường Đại Học Y Dược, Đại Học Huế

“…Các mức độ biểu hiện của đặc điểm Carabelli trên răng cối lớn vĩnh viễn hàm trên được đánh giá theo phân loại của Dahlberg [7], gồm có các mức độ sau:…”

“…Trong nghiên cứu này, RCL1 hàm trên có biểu hiện đặc điểm Carabelli chiếm tỷ lệ 74%. Tỷ lệ cao này tương đồng với kết quả của Phan Anh Chi (64,5%) [1], Joshi (64,6%) [4], Kamatham (63,7%) [5], Smitha (87%) [7]. Tuy nhiên, một số nghiên cứu khác lại cho thấy tỷ lệ RCL1 có biểu hiện đặc điểm Carabelli khá thấp, như nghiên cứu của Hsu (36,8%) [3], Kirthiga (40,5%) [6].…”

Evaluation of the Occlusal Contact between the Opposing Teeth and the Cusp of Carabelli in Maxillary Permanent First Molars in Patients Visiting Peshawar Dental College

“…10 The clinical significance of cusp of Carabelli and other accessory cusps is that they may cause some clinical disturbances such as occlusal interferences, esthetic problems, accidental cusp fracture, carious lesion in cusp of Carabelli groove and irritation of tongue during speech and mastication etc. 11,12 The occlusal contacts between the accessory cusps and opposing teeth cause attritional wear which are characterized by smooth and polished delineated areas known as wear facets. 13 Moreover, these occlusal contacts occur when the maxillary molars occlude with the lingual slopes of mandibular molars.…”