Pilo Raphael, Lewinstein Israel, Ratzon Tal, Cardash Harold S, Brosh Tamar
Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel.
Dent Mater. 2008 Aug;24(8):1058-64. doi: 10.1016/j.dental.2007.12.002. Epub 2008 Feb 7.
To evaluate the effect of dentin and/or metal surface treatments on retention of cast crowns cemented to preparations with compromised retention.
Cast crowns (n=105) were fabricated on extracted molars prepared to 40 degrees convergence and standard height. 60 teeth were randomly divided into: (A) cemented with zinc phosphate cement; (B-D) cemented with resin cement (Compolute, 3M) with either no surface treatment (B), dentin etched and bonded (EBS multi, 3M) (C), or dentin etched and bonded, and metal tribochemically treated (Co-Jet, 3M) (D); 45 teeth were randomly divided and crowns cemented with another resin cement (Rely-X Arc, 3M) with either no surface treatment (E), dentin etched and bonded (Single Bond, 3M) (F), or dentin etched and bonded and metal tribochemically treated (G). Teeth were stored in 100% humidity for 3 months and thermocycled 5000 cycles. Crowns were dislodged from the preparations and retention (MPa) was calculated.
Group D showed significantly higher retention (3.52+/-1.3 MPa) compared to Group C (2.26+/-0.9 MPa), Group B (0.85+/-0.4 MPa), and Group A (1.22+/-0.4 MPa). Group G exhibited significantly higher retention (5.4+/-1.4 MPa) compared to F (2.6+/-1.2 MPa) and E (2.0+/-0.6 MPa). Higher retention corresponded with more cohesive cement type of failure.
Cast crowns with compromised retention cemented by resin cement should undergo combined tribochemical metal treatment and dentin bonding. The crucial link is the interaction of different brands of resin cements with the metal tribochemically treated.
评估牙本质和/或金属表面处理对粘结于固位力受损预备体上的铸造全冠固位力的影响。
在制备成40度聚合度和标准高度的离体磨牙上制作铸造全冠（n = 105）。60颗牙齿随机分为：（A）用磷酸锌水门汀粘结；（B - D）用树脂水门汀（Compolute，3M）粘结，其中（B）未进行表面处理，（C）牙本质酸蚀粘结（EBS multi，3M），（D）牙本质酸蚀粘结且金属进行摩擦化学处理（Co - Jet，3M）；45颗牙齿随机分组，用另一种树脂水门汀（Rely - X Arc，3M）粘结，其中（E）未进行表面处理，（F）牙本质酸蚀粘结（Single Bond，3M），（G）牙本质酸蚀粘结且金属进行摩擦化学处理。牙齿在100%湿度下储存3个月并进行5000次热循环。将全冠从预备体上脱位并计算固位力（MPa）。
与C组（2.26±0.9 MPa）、B组（0.85±0.4 MPa）和A组（1.22±0.4 MPa）相比，D组显示出显著更高的固位力（3.52±1.3 MPa）。与F组（2.6±1.2 MPa）和E组（2.0±0.6 MPa）相比，G组表现出显著更高的固位力（5.4±1.4 MPa）。更高的固位力对应着更多的粘结剂内聚破坏类型。
用树脂水门汀粘结的固位力受损的铸造全冠应进行金属摩擦化学处理和牙本质粘结联合处理。关键环节是不同品牌树脂水门汀与经摩擦化学处理的金属之间的相互作用。
