Stress Distribution after Installation of Fixed Frameworks with Marginal Gaps over Angled and Parallel Implants: A Photoelastic Analysis

Abstract

Stresses were generated after screw tightening of the frameworks, increasing when a load was applied and when a vertical gap was present. Angled implants resulted in oblique stress patterns, which were not transferred with homogeneity to the polymeric model.

Photoelastic analysis of all-on-four concept using different implants angulations for maxilla

“…16,17 This method has been widely applied in dentistry by allowing direct observation of the stress distribution in structures due to the ability of some colorless materials to generate color patterns known as isochromatic fringes during loading and observed in polarized light. 18,19,20,21 One limitation of this technique is the reproducibility of the physical characteristics of the peri-implant tissues, since the photoelastic model has Table 1. Shear stress mean to the two groups in three loads simulation.…”

“…18,19,20 The models were analyzed from two sides (left and right). Qualitative analysis of the stress distribution was made using images obtained from circular polariscope.…”

New Trends in Dental Biomechanics with Photonics Technologies

“…Other studies reported in literature have also evaluated the influence of dental implant design (Figure 2) [39] as also normal dentition, in the load mechanism transfer between teeth or dental prostheses to the surrounding bone [40,41] and also related to the method of retention of dental prostheses to abutments [42][43][44]. The influence of gap values between a fixed framework and implants, placed parallel or angled, in the stress distribution was also investigated [45]. Figure 2.…”

Análise fotoelástica da distribuição das tensões ocorridas no tecido ósseo, ao redor de cinco diferentes desenhos de implante, quando submetidos ao carregamento axial

“…Alguns fatores foram observados na literatura focando a participação do tipo de prótese, do material utilizado (Suedam et al, 2009), da adaptação das mesmas (Binon et al, 1994;Millington;Leung, 1995;Markarian et al, 2007), tipo de conexão (Cehreli et al, 2004;Bernardes et al, 2007;Canay;Nishioka et al, 2009), da altura e diâmetro dos componentes (Suedam et al, 2009). …”

“…As variações e seus efeitos são amplamente discutidas (Schenk;Buser, 1998;Romanos;Nentwig, 2000). (Suedam et al, 2009), da adaptação das mesmas (Binon et al, 1994;Millington;Leung 1995;Markarian et al, 2007), tipo de conexão (Cehrieli et al, 2004;Bernardes et al, 2007;Canay;Nishioka et al, 2009), da altura e diâmetro dos componentes (Suedam et al, 2009 Outros estudos comprovam que a distribuição das tensões não é alterada segundo tipo de conexão protética, principalmente quando o torque correto é aplicado (Bernardes et al, 2007).…”