Effect of occlusal slope related to uneven attrition on root stress distribution and potential fracture

• DOI: 10.1016/j.jds.2018.06.006
• Publication Date: 2018-08-28T17:00:42Z
• Authors: Hai-Ping Xu; Jing Fu; Jing Deng; Qing-Hua Zheng; Wei Zhou; Ding-Ming Huang
• Keywords: Attrition

Severely uneven occlusal attrition is thought to play an important role in the occurrence of spontaneous vertical root fracture (VRF), a frequent problem among Chinese people. This study evaluated influence slope related on stress condition. A finite element model mandibular first molar was established. Two different patterns were simulated 5 models: (A) sound tooth, (B) 0.5-1.5 mm and (C) 2-3 increased buccally, (D) (E) distally. static load 200 N applied vertically or angled at 45° longitudinal axis. The von Mises evaluated. Under loading, more transferred from cervical middle with attrition, especially mesial root, while declined under oblique loading. Stress mainly distributed buccal surface lingual distal maximum loading significantly higher than Uneven made bear stress, increasing risk load. finding suggests that timely restoration sloped morphology teeth severe should be recommended prevent VRFs. Lateral not factor typical fractures, but high could cause fracture.