Department of Prosthodontics and Periodontology, University of Sao Paulo - Bauru School of Dentistry, Bauru, Brazil.
Department of Biological Sciences, University of Sao Paulo - Bauru School of Dentistry, Bauru, Brazil.
J Prosthodont. 2019 Feb;28(2):e552-e556. doi: 10.1111/jopr.12927. Epub 2018 Jul 2.
To evaluate the pullout resistance of CAD/CAM implant-supported crowns cemented with provisional and definitive cements on Ti-base implant abutments.
Sixty crowns were milled for use in Ti-base implant abutments and divided (n = 15/group) according to material, as follows: (a) [Pr] Temporary acrylic resin; (b) [Co-Cr] Cobalt-Chromium alloy; (c) [Zr] polycrystalline zirconia; and (d) [Ti] titanium. The cementation was performed with RelyX Temp NE (RxT) cement or RelyX U200 self-etching resin cement, under a 50 N (5 kg) load for 10 minutes. Twenty-four hours after cementation, the crowns were subjected to the pullout test in a universal test machine, at a 1.0 mm/min crosshead speed. The tests were performed first without cement to evaluate frictional resistance (Baseline), then with provisional cement (RelyX Temp NE without cement again (Baseline After RxT), and finally with resin cement (U200). The results were analyzed by ANOVA and Tukey test (p < 0.05).
Data evaluation as a function of cement type demonstrated the superiority of resin-based cements relative to provisional and baseline groups (p < 0.01). While Co-Cr crowns presented the highest pullout strength values, Pr showed the lowest values (data collapsed over cement) (p < 0.001). Retentiveness data as a function of both factors demonstrated similar pullout resistance between groups without cement (p < 0.001), except Zr baseline. Also, Co-Cr presented higher pullout strength compared to other materials.
Self-adhesive resin cement exhibited superior retention compared to temporary cement, regardless of crown material. Co-Cr and titanium presented higher levels of retention to Ti-base abutment after being cemented.
评估 CAD/CAM 种植体支持的冠用临时和最终粘固剂在钛基底种植体基台上的固位力。
将 60 个冠磨制成用于钛基底种植体基台的试件，并根据材料分为（n=15/组）：（a）[Pr]临时丙烯酸树脂；（b）[Co-Cr]钴铬合金；（c）[Zr]多晶氧化锆；和（d）[Ti]钛。用 RelyX Temp NE（RxT）粘固剂或 RelyX U200 自酸蚀树脂粘固剂在 50 N（5 kg）负荷下粘固 10 分钟。粘固后 24 小时，在万能试验机上以 1.0 mm/min 的十字头速度进行冠的拔出试验。试验首先在不粘固剂的情况下进行，以评估摩擦阻力（基线），然后用临时粘固剂（再次用 RelyX Temp NE 无粘固剂（RxT 后基线），最后用树脂粘固剂（U200）。采用方差分析和 Tukey 检验（p<0.05）对结果进行分析。
根据粘固剂类型进行数据评估表明，与临时和基线组相比，树脂基粘固剂具有优越性（p<0.01）。虽然 Co-Cr 冠具有最高的拔出强度值，但 Pr 显示出最低的值（数据在粘固剂上叠加）（p<0.001）。作为两个因素的函数，保留数据表明无粘固剂组之间具有相似的拔出阻力（p<0.001），Zr 基线除外。此外，Co-Cr 与其他材料相比具有更高的拔出强度。
自粘接树脂粘固剂的保留力优于临时粘固剂，与冠材料无关。Co-Cr 和钛在粘固于钛基底基台后具有更高的保留水平。
