Statement of problem

New materials and precise manufacturing processes allow for new processes in the veneering and production of fixed dental prostheses. However, data on the bond strength of computer-aided design and computer-aided manufacturing (CAD-CAM) and conventional veneering materials to substrates bonded with different composite resins are lacking.

Purpose

The purpose of this in vitro study was to investigate the shear bond strength (SBS) of 2 CAD-CAM, Lava Ultimate (LVU) and VITABLOCS Mark II (VMII), and 3 conventional veneering materials (VM9, VM13, VTI) to 3 different substrates: zirconia (ZIR), cobalt-chromium (CC), and titanium (TIT).

Material and methods

Substrates and veneering cylinders were manufactured and bonded by using 3 different composite resins, RelyX Unicem (RUL), RelyX Ultimate (RXU), and Sinfony (SIN), after various pretreatments (n=18). Half the specimens underwent artificial aging before SBS testing, and failure types were analyzed. Univariate 1-way ANOVA, Kruskal-Wallis, and Mann-Whitney U were computed (α=.05).

Results

CC substrates bonded with RUL showed the highest SBS (P=.007). ZIR substrates bonded with RXU presented higher SBS than TIT substrates (P=.007). ZIR substrates bonded with SIN showed higher SBS than CC substrates (P<.001). SIN veneered groups showed lower SBS than that observed for VM9/13/VTI (P<.001). SIN veneered LVU and VMII substrates presented lower SBS (P<.001). Thermocycling led to a reduction in SBS for most groups (P=.001-.022). SIN veneered substrates and RXU veneered VMII substrates resulted in lower SBS than that seen for VM9/13/VTI and veneered ZIR substrates bonded with SIN or RXU (P<.001). Adhesive failures were most common.

Conclusions

While RUL is capable of forming a stable bond to CC without pretreatment, ZIR substrates achieve higher SBS after conditioning with an MDP-containing primer when using RXU or SIN than that seen for RUL. Pretreated CAD-CAM–veneered ZIR substrates bonded with SIN or RXU led to similar SBS results to those observed for conventional veneers, while veneering with SIN resulted in lower SBS.

中文翻译：

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CAD-CAM和常规饰面材料对不同框架的粘合强度

问题陈述

新材料和精确的制造工艺可为固定牙科假体的镶面和生产提供新的工艺。但是，缺乏有关计算机辅助设计和计算机辅助制造（CAD-CAM）以及传统饰面材料对使用不同复合树脂粘合的基材的粘合强度的数据。

目的

这项体外研究的目的是研究2种CAD-CAM，Lava Ultimate（LVU）和VITABLOCS Mark II（VMII）以及3种常规饰面材料（VM9，VM13，VTI）对3的剪切粘结强度（SBS）不同的底物：氧化锆（ZIR），钴铬（CC）和钛（TIT）。

材料与方法

经过各种预处理（n = 18）后，使用RelyX Unicem（RUL），RelyX Ultimate（RXU）和Sinfony（SIN）3种不同的复合树脂制造并粘合了基材和饰面滚筒。在进行SBS测试之前，有一半的样品经过了人工时效处理，并对失效类型进行了分析。计算了单变量1次方差分析，Kruskal-Wallis和Mann-Whitney U（α= .05）。

结果

与RUL粘合的CC基材显示出最高的SBS（P = .007）。与RXU粘合的ZIR基板的SBS高于TIT基板（P = .007）。与SIN粘合的ZIR基板显示出比CC基板更高的SBS（P <.001）。SIN贴面组的SBS低于VM9 / 13 / VTI观察到的（S <.001）。SIN贴面LVU和VMII基材的SBS较低（P <.001）。热循环导致大多数组的SBS降低（P = .001-.022）。SIN贴面基板和RXU贴面VMII基板产生的SBS低于VM9 / 13 / VTI和贴有SIN或RXU的贴面ZIR基板的SBS（P <.001）。胶粘剂失效是最常见的。

结论

尽管RUL无需预处理即可与CC形成稳定的键合，但在使用RXU或SIN进行含MDP的底漆处理后，ZIR底物比RUL可获得更高的SBS。与SIN或RXU粘合的经过预处理的CAD-CAM贴面ZIR基材导致的SBS结果与常规单板所观察到的相似，而SIN贴面导致较低的SBS。