Platform‐Switching for Cemented Versus Screwed Fixed Dental Prostheses: Reliability and Failure Modes: An In Vitro Study

Abstract

The probability of survival of cement-retained ISFDP was higher than screw-retained, irrespective of implant-abutment horizontal configuration.

Survival and failure modes: platform‐switching for internal and external hexagon cemented fixed dental prostheses

“…For all groups, failure predominantly involved abutment screw fracture. Two representative fractographic analyses are presented in Figs and for external hexagon implant groups, whereas for internal hexagon implant groups the same patterns have been reported elsewhere . The abutments remained intact in ERC and ESC groups after mechanical testing.…”

“…The performance of ISFDPs (where abutment splinting may have a more prominent effect than the abutment material) or fixation method has been less explored. A recent fatigue study performed by our group showed that the fixation method had a significant impact on the survival of ISFDPs, with a lower percentage of survival for screwed restorations compared with cemented restorations , which is in agreement with a systematic review . On the other hand, it is unknown whether the performance of cemented three‐unit FDPs with mismatched platform is influenced by the implant–abutment connection design.…”

“…The group combination of implant–abutment connection design and horizontal configuration of the implant–abutment platform used for the three‐unit posterior ISFDP ( n = 21 per group) were as follows: implants with external hexagon connection and regular platform (ERC); implants with external hexagon connection and switched platform (ESC); implants with internal hexagon connection and regular platform (IRC); and implants with internal hexagon connection and switched platform (ISC) (Fig. , Table ).…”

“…On the other hand, it is unknown whether the performance of cemented three‐unit FDPs with mismatched platform is influenced by the implant–abutment connection design. Therefore, the present study aimed to evaluate the survival and the failure modes of three‐unit ISFDPs with external hexagon connections either with matched or mismatched implant–abutment platforms, using step‐stress accelerated life‐testing (SSALT), and to compare the results with data generated on internal connection counterparts tested under the same conditions . The hypothesis tested was that no differences in survival and failure modes would be found between prostheses with these configurations considering that the three‐unit ISFDPs with a molar pontic are splinted.…”

Survival/Success of Dental Implants with Acid-Etched Surfaces: A Retrospective Evaluation After 8 to 10 Years

“…On the other hand, the literature demonstrates that cemented prostheses have been associated with a higher risk for peri-implantitis probably due to the occurrence of residual cement in the peri-implant sulcus (26). The greater possibility of misfit or fractures of the screwed prostheses may have increased the gap size and contributed to the presence of peri-implantitis (27). However, the information about the prosthetic complications was not provided by this study.…”