Browsing by Author "Salama, AA"

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    The Effect of Platform-Switching Implants and Different Abutment Materials on the Stress Distribution of Implant-Supported Restorations
    (QUINTESSENCE PUBLISHING CO INC,, 2020-04) Halim, CH; El Mahallawi, O; Katamesh, HA.; Salama, AA
    The purpose of this study was to evaluate the effect of implant platform-switching design and abutment materials on the stress distribution around implants. Implants were fixed in epoxy-resin models restoring posterior missing first molars, representing two main groups according to the implant-abutment connection. Each group was subdivided according to the type of abutment material used (titanium or zirconia). Twenty monolithic fully anatomical zirconia crowns were fabricated. Stress analysis was measured around the implants using strain gauges during the static loading of each implant-supported crown. Data were collected, tabulated, and statistically analyzed. Standard implant-abutment connection groups recorded the highest (statistically significant; P < .05) mean strain values compared to platform-switching connection groups. Abutment materials in both groups recorded statistically nonsignificant (P > .05) mean strain values. The platform-switching concept showed better crestal-bone stress distribution around implant-supported restorations. Abutment materials expressed no statistically significant effect on the stress distribution around implant-supported restorations. Zirconia and titanium abutments could withstand the functional loads developed during physiologic chewing in the molar area.
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    The mechanical complications of platform switching connection of implant-supported restorations: A systematic review and meta-analysis
    (ARIESDUE SRL, 2019-09) Farid, KA; Halim, CH; Katamish, HA; Salama, AA
    Aim Platform implant abutment connection proved success in preserving crestal bone around implants, but the increased stress concentration on the prosthetic components is still a question. The primary aim of this systematic review was to evaluate the available evidence on the mechanical effect of implant platform switching concept on implant prosthetic components. Methods A protocol of electronic and hand research was performed for English based researches comparing one or more PS groups with one or more PM groups to develop an answer for the following question: "Will the platform switching technique affect the amount of stresses generated within implant prosthetic components causing mechanical complications? A meta-analysis was performed to evaluate the impact of implant-abutment platform mismatch on implant prosthetic components. Results Eleven publications from twenty research studies were included. Results from the meta-analysis demonstrated the odds of survival in the Platform matching connection arm are 2.13 times more compared to the Platform switching arm. (P-value=0.0316) For the random effects model, the odds of survival in the PS arm is not statistically significantly different compared to the PM arm (p-value=0.2224) due to substantial heterogeneity of the included studies results in regards to implant prosthetic components mechanical complications. Conclusion This systematic review showed higher stress concentration in the implant prosthetic components regarding using platform switched implants, more randomized controlled clinical trials with bigger samples are needed to confirm our findings, but the current evidence demonstrates that nonsignificant differences between platform switching concept and platform matching. It is recommended to further investigate the mechanical complications that might arise when platform switching concept is used.