Document Detail

Mongoloid features of the permanent mandibular second molar in Singaporean Chinese.
MedLine Citation:
PMID:  1785968     Owner:  NLM     Status:  MEDLINE    
The permanent mandibular second molar is usually described as four-cusped, two placed buccally and two lingually. It has been reported that five-cusp forms were more commonly present in dentitions of mongoloid origin. The prevalence and features of this tooth form were examined in a Singaporean sample of 380 subjects with bilateral presence of the mandibular second molars. One-hundred and sixty four cases (43.1 per cent) were found to have bilateral occurrence of five-cusp forms and thirty-four cases (8.9 per cent) with unilateral occurrence. Six-cusp forms were detected in three cases. There was almost equal prevalence in both sexes and both sides were equally involved in unilateral cases. The extra cusp was smallest, placed disto-buccally and sometimes midway at the distal border. The occlusal outline of five-cusp second molars was rectangular with a somewhat similar groove pattern to the first molar. There was an increase in the mesio-distal width of the crown. The high incidence was comparable with other studies of mongoloid dentitions and it could be considered as an important morphological and racial characteristic of the Singaporean Chinese.
H S Loh
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Australian dental journal     Volume:  36     ISSN:  0045-0421     ISO Abbreviation:  Aust Dent J     Publication Date:  1991 Dec 
Date Detail:
Created Date:  1992-03-13     Completed Date:  1992-03-13     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370612     Medline TA:  Aust Dent J     Country:  AUSTRALIA    
Other Details:
Languages:  eng     Pagination:  442-4     Citation Subset:  D; IM    
Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, National University of Singapore.
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MeSH Terms
Asian Continental Ancestry Group*
China / ethnology
Molar / abnormalities*,  pathology
Tooth Abnormalities / epidemiology,  ethnology

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