Biomechanical considerations on tooth-implant supported fixed partial dentures

Abstract

This article discusses the connection of teeth to implants, in order to restore partial edentulism. The main problem arising from this connection is tooth intrusion, which can occur in up to 7.3% of the cases. The justification of this complication is being attempted through the perspective of biomechanics of the involved anatomical structures, that is, the periodontal ligament and the bone, as well as that of the teeth- and implant-supported fixed partial dentures.

Full Contoured Tooth-Implant Supported 3-Pointic All-Ceramic Denture During Occlusal Load Transfer in Lateral Region

“…Special caution is advised when treatment based on a tooth-implant splint is planed [1][2][3]. In the result of the dissimilar mobility between the implant and the tooth the higher bending moment is induced in stiffer implantologic support which may fail or lose osseointegration [4][5][6][7][8][9][10][11].…”

Evaluación del Comportamiento de Dos Sistemas de Ajustes Uniendo Diente e Implante Asociados con una Prótesis Parcial Removible con Extensión Distal: Análisis de Elementos Finitos

“…En ambos modelos se dio una mayor concentración de esfuerzos en el implante debido a su mayor modulo elástico comparado con el diente pilar, estos se ubicaron en la cresta ósea, independiente del tipo de conexión en el diente(rígido o resiliente), coincidiendo con lo encontrado en otros estudios, donde las diferencias biomecánicas por la ausencia del ligamento periodontal en el implante hace que el centro de rotación se ubique mas crestal, a diferencia del diente donde la concentración es más uniforme a lo largo de la superficie radicular. Esto hace que la ferulización se comporte como un cantiliver sobrecargando el implante (Menicucci et al, 2002;Pellizzer et al, 2010;Michalakis et al, 2012). Se observó un mayor von Mises para el implante en el modelo 1 (rígido vs resiliente),lo que indica que la utilización de dos componentes resilientes( modelo 2), favorece una mejor distribución de esfuerzos al diente pilar y al implante, debido a la trasmisión de esfuerzos al reborde residual que permite el movimiento vertical de la PPR.…”

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

“…This phase corresponds with a first phase of readiness orientation and stretching of the PDL fibers without strain. The collagen fibers of PDL have a wavy configuration in the relaxed state 29 which enables the tooth enable to move easily without any resistance at the beginning of force application. This initial displacement of a natural abutment would cause stress concentration around a rigidly connected implant abutment before the two become comparable in their resiliencies.…”

“…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.…”

“…When forces were directed on the implant segment, the stress connector type (rigid, non-rigid), connector position( near the tooth, near the implant), length of span, the features of materials of which the prosthesis is made etc. ), d) characteristics of the implant system (implant shape, length, diameter, surface macrostructure, implant-toabutment connection), e) characteristic of the bone around the teeth and the implants ( the quality and the quantity of the bone), f) number of connected teeth and implants 2,14,27,29 . All these factors determine the stress which affects the bone around splinted implants and teeth.…”