IADR Abstract Archives
A Novel Method for Pretreating Zirconia Resin-Bonded Fixed Dental Protheses
Objectives: Debonding of zirconia cantilevered resin-bonded fixed dental prostheses (RBFDPs) remains the main treatment complication. Nanostructured alumina coating (NAC) provides a promising pretreatment of zirconia bonding surface, which does not damage the zirconia surface. The aim of the study was to “in vitro” and “in vivo” evaluate the effect of NAC on zirconia RBFDPs and compare it to clinically established airborne-particle abrasion (APA).
Methods: For studying the effect of NAC “in vitro”, the bonding performances of RBFDPs bonded on complementary zirconia incisors with both substrates pretreated with NAC or APA were compared after 150 days of water storage and thermomechanical aging (37.500 cycles, 5-55 °C; 50N/1.2×106 cycles) by measuring load-bearing capacity (LBC) (T-test, ANOVA, Tukey’s, P<.05). For studying NAC “in vivo”, the success and survival rates of NAC and APA pretreated RBFDPs were compared in a prospective randomized, controlled, double-blind clinical trial (Kaplan-Meier, log-rank test, P<.05).
Results: Before aging, NAC RBFDPs provided superior mean LBC (724 ±58 N) to APA (564 ±31 N), while after aging, no differences were detected with the LBC approximately 590 N (P>.05). After a mean ±standard deviation observation period of 33.1 ±12.9 months (maximum 52.8 months), 33 participants with 37 restorations were examined. The survival rates for both groups were 100%, while the success rate was 87,4% for the NAC and 80.2% for the APA group, with no significant differences (P>.05).
Conclusions: NAC could be regarded as a viable alternative pretreatment method for zirconia RBFDPs, especially when fabricated from translucent zirconia, which is more susceptible to the damaging effect of APA.
Methods: For studying the effect of NAC “in vitro”, the bonding performances of RBFDPs bonded on complementary zirconia incisors with both substrates pretreated with NAC or APA were compared after 150 days of water storage and thermomechanical aging (37.500 cycles, 5-55 °C; 50N/1.2×106 cycles) by measuring load-bearing capacity (LBC) (T-test, ANOVA, Tukey’s, P<.05). For studying NAC “in vivo”, the success and survival rates of NAC and APA pretreated RBFDPs were compared in a prospective randomized, controlled, double-blind clinical trial (Kaplan-Meier, log-rank test, P<.05).
Results: Before aging, NAC RBFDPs provided superior mean LBC (724 ±58 N) to APA (564 ±31 N), while after aging, no differences were detected with the LBC approximately 590 N (P>.05). After a mean ±standard deviation observation period of 33.1 ±12.9 months (maximum 52.8 months), 33 participants with 37 restorations were examined. The survival rates for both groups were 100%, while the success rate was 87,4% for the NAC and 80.2% for the APA group, with no significant differences (P>.05).
Conclusions: NAC could be regarded as a viable alternative pretreatment method for zirconia RBFDPs, especially when fabricated from translucent zirconia, which is more susceptible to the damaging effect of APA.