Clinical studies on the dental and occlusal conditions of molars with vertical cracking of the root
Zeng, Y.; Wang, J.; Zhou, S.
Zhonghua Kou Qiang Yi Xue Za Zhi 33(4): 222-224
1998
ISSN/ISBN: 1002-0098 PMID: 11774638 Document Number: 489956
To study the contributing factors inducing vertical cracking of the root of molars. The dental, periodontal, and occlusal conditions of molars with vertical root cracking were studied in 34 cases (39 teeth). The age range of patients was 40-60 years. The crackings occurred mostly at mesial or mesio-buccal roots, their periodontal conditions were much more worse than those roots without cracking and manifested by deep pocket. The abrasion of the occlusal surfaces was more severe than those molars with no cracking, their contact areas were unstable and deviated buccallly. The direction of force during chewing was therefore horizontal, viz., mesio-distally and bucco-lingually. The vertical root cracking of molars is associated with traumatical occlusal contact due to severe abrasion which increases the loading during chewing.