Tooth intrusion in implant-assisted prostheses

Biomechanical outcomes of tooth-implant-supported fixed partial prostheses (FPPs) in periodontally healthy patients using root shape dental implants

“…Tooth intrusion is one of the main problems when connected to implants which can occur in up to 7.3% of the cases 29 . Several studies tried to explain the causes of this phenomenon 31,47 , but till now there is no clear answer. Some authors insist that the cause of intrusion is multifactorial 31,48,49 .…”

“…Several studies tried to explain the causes of this phenomenon 31,47 , but till now there is no clear answer. Some authors insist that the cause of intrusion is multifactorial 31,48,49 . Some of the possible factors are: disuse atrophy, differential energy dissipation, impaired rebound memory, rachet effect, debris impaction, fixed prosthesis flexure, mandibular flexure (only in mandible).…”

“…However, this problem can also occur with any other attachment type 37,48 . Several authors showed a reversibility of tooth intrusion 31,50 by disconnecting solder joints or other methods (occlusal adjustment, changing the contours of coping sidewalls etc. ).…”

“…The natural tooth receives the impact energy and transfers it in to the end of the root in the form of a stress wave 31 . Most of the energy is dissipated by the highly absorptive PDL.…”

Spontaneous Recovery of an Intruded Tooth Bounded by Implants: a Clinical Report

“…더구나 임플란트와 연결된 고정성 보 철의 자연치 지대치 압하(intrusion)현상이 보고되 면서 [3][4][5] 자연치와 임플란트의 연결이 가능한가라 는 근본적 의문에서 연결 방식의 차이, 수명에 대 한 다양한 관심이 집중되고 있다. 6) 1993년에 보고된 설문조사의 결과 자연치의 압하는 disuse atrophy, debris impaction, impaired rebound memory, mechanical binding이 원인으로 지 목되어 왔으나 7) 그 후 stress wave theory, flexure of mandible and/or framework이 다른 원인으로 보고 되어 설득력을 얻고 있다.…”