Importance of a distal proximal contact on load transfer by implant-supported single adjacent crowns in posterior region of the mandible: a photoelastic study

Abstract

ObjectiveThis study aimed to evaluate the importance of a distal proximal contact on the load transfer to the posterior region of the mandible by non-splinted adjacent implant-supported crowns using photoelastic stress analysis. Material and MethodsA rectangular model (68x30x15 mm) was made of polymethylmethacrylate resin to simulate half of the mandibular arch. One model was completed with resin replicas representing the first premolar and second molar and with two 3.75 mm dia.x11 mm internal hexagon threaded implants replacing the second premolar and first molar. The other model was manufactured in the same way but without the second molar. Both models were duplicated using photoelastic resin. The roots of the teeth replicas were covered with a layer of polyether impression material to simulate the periodontal ligament. Two different vertical loads were applied to the crowns as follows: 1 - single static point load alternately applied to the crowns replacing the second premolar and first molar (50 N); 2 - simultaneous static point loads applied to both of the crowns replacing the second premolar and first molar (100 N). The resulting isochromatic fringe pattern in the photoelastic model was monitored and photographed.ResultsAll loading conditions studied showed that the presence of the second molar has changed the load transmission and the pattern of stresses.ConclusionResults showed that the presence of a second molar proximal contact can help minimize the stresses around the implants.

The prevalence and associated factors of proximal contact loss between implant restoration and adjacent tooth after function: A retrospective study

“…Although the occlusal force may also act on the distal side. However, according to Aguiar Júnior et al 34 when an implant prosthesis has an adjacent natural tooth at the distal side, the occlusal force acting on the implant tooth and adjacent tooth decreases. In addition, the ACF is five times greater than the PCF 21 .…”

Avaliação das tensões que incidem sobre próteses totais suportadas por implantes múltiplos oriundas de diferentes técnicas de moldagem: análise fotoelástica

“…A proposta do presente estudo foi avaliar as tensões nas estruturas de suporte de próteses totais sobre implantes, oriundas de diferentes técnicas de moldagem com auxílio do método fotoelástico, sendo este, um dos mais apropriados para esta finalidade, como desvelam inúmeras pesquisas (Glickman et al, 1970;Laganá e Zanetti, 1995;Phillips, 2000;Cehreli et al, 2004;Aguiar Júnior et al, 2013;Pesqueira et al, 2014;Pimentel et al, 2015;Galvão et al 2016;De Medeiros et al, 2017Presotto et al, 2017;Tonin et al, 2021;Abarno et al, 2021;Bittencourt et al, 2022).…”