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Morphological changes in the crown of mandibular molars with an additional distolingual root

 Ki Rim Kim  ;  Je Seon Song  ;  Seong-Oh Kim  ;  Seung Hye Kim  ;  Wonse Park  ;  Heung-Kyu Son 
 ARCHIVES OF ORAL BIOLOGY, Vol.58(3) : 248-253, 2013 
Journal Title
Issue Date
Adolescent ; Adult ; Child ; Child, Preschool ; Female ; Humans ; Male ; Mandible/diagnostic imaging ; Molar/abnormalities* ; Molar/diagnostic imaging ; Molar/pathology ; Odontometry/methods ; Radiography, Bitewing ; Radiography, Panoramic ; Republic of Korea ; Tomography, X-Ray Computed ; Tooth Crown/abnormalities ; Tooth Crown/pathology* ; Tooth Root/abnormalities* ; Tooth Root/diagnostic imaging ; Tooth, Deciduous/abnormalities ; Tooth, Deciduous/diagnostic imaging ; Tooth, Deciduous/pathology ; Young Adult
Mandibular molars ; Distolingual root ; Morphological characteristics ; Crown ; Sixth cusp
OBJECTIVE: The mandibular molars typically have two roots placed mesiodistally, but they occasionally have an additional distolingual (DL) root. This study was to determine the morphological characteristics of the crown of such mandibular molars. DESIGN: Radiographic records and study models were collected from a Korean population (n=86 patients). Each molar was assigned to either the experimental group (i.e. with a DL root) or the control group (i.e. without a DL root; n=41 patients) based on the radiographic findings. The intercuspal distances of the first permanent molars (total, n=100; control/experimental, n=50/50) and primary second molars (46, 23/23), and the largest buccolingual/mesiodistal widths of those molars and primary first molars (42, 21/21) were measured for molars with and without a DL root. In addition, the correlation between the existence of a sixth cusp and a DL root was examined. RESULTS: The crowns of first permanent and primary second molars with DL roots had significantly larger intercuspal distances between the distobuccal-distolingual cusp tips and a larger distal-area buccolingual width than those without the DL root (t-test; p<0.05). There was no significant correlation between the existence of a sixth cusp and the presence of a DL root. CONCLUSIONS: The existence of a DL root was associated with larger buccolingual dimensions, especially in the distal area.
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2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Pediatric Dentistry (소아치과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Seong Oh(김성오) ORCID logo https://orcid.org/0000-0002-8620-1377
Kim, Seung Hye(김승혜)
Park, Wonse(박원서) ORCID logo https://orcid.org/0000-0002-2081-1156
Son, Heung Kyu(손흥규)
Song, Je Seon(송제선) ORCID logo https://orcid.org/0000-0001-8620-5629
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