Influence of CAD/CAM materials on damping behavior of implant-supported crown

Abstract

This study was to investigate the damping capacity of implant-supported crowns made from various computer-aided design and computer-aided manufacturing (CAD-CAM) restorative materials.�A titanium implant fixture was embedded in epoxy resin.�Crown specimens were divided into three groups: Zirconia (Z), Lithium disilicate (E), and Polymethyl methacrylate�(P). Each crown was subdivided into Uncement�(Un) and Adhesive resin cement (RC) subgroups�(n=5). Specimens were loaded�(0-200N).�Strain gauges were attached to measure microstrains at crestal and apical levels. Damping capacity was determined based on load-time curves,�microstrain-time curves, and time required to reach the maximum load.�A two-way ANOVA with Tukey post hoc test and independent�t-test were conducted (?=0.05). The results showed that�slopes of curves�and time to reach maximum load were similar in the Z and E groups (p>0.05), but the P group exhibited less steep slopes and more time to reach maximum load (p<0.05). The UN group had significantly steeper microstrain slopes at crestal level and less time to reach maximum load compared to the AR group (p<0.05). In conclusion, the crown material significantly influenced the damping capacity, with lower modulus of elasticity materials showing higher damping capacity. Cementation enhanced�damping capacity in implant-supported crowns.