IADR Abstract Archives
A 4-Year Retrospective Study of Survival of Implant-Supported Zirconia-Based Hybrid-Abutment Crowns
Objectives: The aim of this study was to assess the 4-year clinical performance and survival of implant-supported zirconia-based crowns cemented to hybrid abutments.
Methods: In this retrospective study, patients treated with implant-supported zirconia-based crowns cemented to hybrid abutments at CHU Farhat Hached Sousse; Tunisia during 4 years (from 2016 March to 2020 March) were considered.
All the Ti bases were air abraded with 50 µm Al2O3 under standardized conditions (10sec, 2.5 bar) and restored with zirconia crowns .
Monolayer and bilayer zirconia crowns were constructed and cemented to zirconia hybrid abutments.
Ti-bases(n=35) were divided according to the zirconia crown conception (monolayer vs bilayer) and the cement system used (Multilink Hybrid Abutment, vs RelyX Ultimate).
Clinical and standardized radiographic examinations were performed to assess the survival of implants and to register biological and technical complications The data were compared using statistical tests(alpha =5%).
Results: At the 4-year follow-up ,26 (74.28%)prosthesis did not show any complications.
Complications that occurred in restorations were as follows:extraction of abutment ceramic tooth (n=1), loss of retention (n=4) and ceramic fracture (n=4).
The fracture load of monolayer zirconia crowns was significantly greater than that of bilayer crowns. Monolayer zirconia crowns showed bulk fracture within the monolayer, while bilayer crowns exhibited cohesive fracture within the veneering porcelain only.
Differences between the groups were statistically significant (P < 0.05)
Bonding failure varied from 2.7% (Multilink Hybrid) to 3.4% (RelyX Ultimate) with no significant differences between the groups (P> 0.05).
Conclusions: Airborne abrasion with 50 µm Al2O3 particles on the Ti base surface and the use of both Multilink Hybrid and RelyX Ultimate improved bonding stability and retention forces of adhesively cemented crowns.
Monolayer implant-supported hybrid-abutment crowns exhibit significantly higher fracture resistance compared to bilayer crowns,
Methods: In this retrospective study, patients treated with implant-supported zirconia-based crowns cemented to hybrid abutments at CHU Farhat Hached Sousse; Tunisia during 4 years (from 2016 March to 2020 March) were considered.
All the Ti bases were air abraded with 50 µm Al2O3 under standardized conditions (10sec, 2.5 bar) and restored with zirconia crowns .
Monolayer and bilayer zirconia crowns were constructed and cemented to zirconia hybrid abutments.
Ti-bases(n=35) were divided according to the zirconia crown conception (monolayer vs bilayer) and the cement system used (Multilink Hybrid Abutment, vs RelyX Ultimate).
Clinical and standardized radiographic examinations were performed to assess the survival of implants and to register biological and technical complications The data were compared using statistical tests(alpha =5%).
Results: At the 4-year follow-up ,26 (74.28%)prosthesis did not show any complications.
Complications that occurred in restorations were as follows:extraction of abutment ceramic tooth (n=1), loss of retention (n=4) and ceramic fracture (n=4).
The fracture load of monolayer zirconia crowns was significantly greater than that of bilayer crowns. Monolayer zirconia crowns showed bulk fracture within the monolayer, while bilayer crowns exhibited cohesive fracture within the veneering porcelain only.
Differences between the groups were statistically significant (P < 0.05)
Bonding failure varied from 2.7% (Multilink Hybrid) to 3.4% (RelyX Ultimate) with no significant differences between the groups (P> 0.05).
Conclusions: Airborne abrasion with 50 µm Al2O3 particles on the Ti base surface and the use of both Multilink Hybrid and RelyX Ultimate improved bonding stability and retention forces of adhesively cemented crowns.
Monolayer implant-supported hybrid-abutment crowns exhibit significantly higher fracture resistance compared to bilayer crowns,