The influence of various occlusal materials on stresses transferred to implant‐supported prostheses and supporting bone: A three‐dimensional finite‐element study

Abstract

The aim of this numerical analysis was to evaluate the amount and localization of stress that occurs with various materials used in implant-crown design under functional forces. Computer-aided design techniques and a finite-element stress analysis method were used for evaluation. A 4.1 x 10-mm implant placed in the mandibular second premolar area was simulated and analyzed. Simulation and analysis were performed with the use of COSMOS/M software and Pro/Engineer 2000i on a Dual Pentium III 1-GHz computer. Crown designs were as follows: porcelain fused to noble metal crown, porcelain fused to base metal crown, In-Ceram porcelain crown, and IPS Empress 2 porcelain crown. A 300-N vertical force was applied to the centric relation stop points of the crowns. The results of this study indicated that different types of restorative materials play an important role in the amount and distribution of the stresses in the superstructure and the implant. The highest stress values were observed in the IPS Empress 2 porcelain crown design (600 MPa). Porcelain fused to base metal and In-Ceram framework designs transferred less stress to abutment. Type of restorative materials used in implant crown designs are significant factors in the amount and distribution of the stresses on superstructure and implant under functional forces. Porcelain fused to base metal (149 MPa) and In-Ceram (173 MPa) crown designs induced higher von Mises stress values within the framework than porcelain fused to noble metal (108 MPa) and IPS Empress 2 (119 MPa) porcelain crown designs.

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

“…Although all the structures were assumed to be isotropic, homogeneous, and linear elastic, it is known that these conditions do not occur in live tissues, such as the cortical bone, which is transversely isotropic and inhomogeneous (19). The level of osseointegration was considered to be 100%, which has also been demonstrated to be incompatible with real conditions; however, studies have found that the analysis of non-linear frictional contacts and complete osseointegration of the bone-implant interface led to similar results (26,27).…”

“…The level of osseointegration was considered to be 100%, which has also been demonstrated to be incompatible with real conditions; however, studies have found that the analysis of non-linear frictional contacts and complete osseointegration of the bone-implant interface led to similar results (26,27). The screw and implant thread were removed, as they were found to be irrelevant to the analysis after convergence tests and provided a significant reduction in elements (19).…”

“…However, controversial results were observed as the misfit amplification caused a considerable increase in stresses in peri-implant bone tissue in implant-supported fixed prostheses and did not influence the stress values in peri-implant bone in overdenture retaining systems. Different framework materials for single crowns (19) fixed-partial prostheses (14) and full arch prostheses (20) were evaluated with respect to the stresses transferred to peri-implant tissue and prosthetic structures; however, the presence of vertical misfit, a clinical possibility, was not considered. The aim of this study was to evaluate the influence of the framework material and different levels of vertical misfit on the stresses created in a partial implant-supported prosthesis (framework and porcelain veneer), retention screw, and peri-implant bone during usage of the prosthesis.…”

Wear and Corrosion Interactions on Titanium in Oral Environment: Literature Review

“…The highest mastication forces are generated at the end of the chewing cycle when sliding motion stops as the teeth reach the centric occlusion that produces localized abrasion wear of contacting dental surfaces [27,28]. In literature, the maximum biting forces were measured by different methods (e.g., electromyography, occlusal transducers) and are in the range of 89-150 N at the incisors (anterior region), 133-334 N at the canines, 220-445 N at the premolars (intermediary region), and 400-600 N at the molars (posterior region) [32][33][34].…”

Effect of Crown Material, Implant Platform and Abutment Design on the Stress Distribution Around Implant-Supported Dental Restorations: A Systematic Review.

“…In addition, proper selection of restorative materials especially those with stress absorbing behavior is also considered an important factor that may influence peri-implant stress distribution under functional forces 12,13 .…”