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The effects of thermal mismatch and fabrication procedures on the deflection of layered all-ceramic discs

机译：热失配和制造工艺对层状全瓷盘偏转的影响

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Objectives. Residual thermal stress caused by thermal incompatibility of ceramic core and veneering porcelain in all-ceramic restorations might induce fracture or distortion of the restoration. The aim of this study was to evaluate the thermal compatibility between a ceramic core and veneering porcelain by measuring the bending of layered discs and to compare the result with the thermal mismatch values. Methods. Thirty-five heat-pressed ceramic core discs were made and divided into seven groups (n = 5). One group of discs was used as control and subjected only to firing cycles, while the other groups of discs were veneered with porcelains. The mismatch of thermal contraction coefficient values of the Empress 2 Core and veneer porcelains used ranged from -3.7 to 3.8 ppm/℃. Results. The Empress 2 Core disc without a veneer (control) was not significantly deflected by the fabrication procedures. The deflection of layered discs was strongly influenced by the degree of thermal mismatch during fabrication procedures. The greatest deflection occurred during the 2nd dentin firing and with the largest mismatch either positive or negative. Sigificance. The deflection test proved to be a reliable test method for the evaluation of thermal compatibility of porcelains in all-ceramic systems.
机译：目标。在全瓷修复体中，由于陶瓷芯和饰面瓷的热不相容性引起的残余热应力可能会导致修复体断裂或变形。这项研究的目的是通过测量分层圆盘的弯曲度来评估陶瓷芯与饰面瓷之间的热相容性，并将结果与​​热失配值进行比较。方法。制作了35个热压陶瓷芯盘，并分为7组（n = 5）。一组圆盘用作对照，仅经受烧制循环，而另一组圆盘则用瓷贴面。 Empress 2 Core和单板瓷器的热收缩系数值不匹配，范围为-3.7至3.8 ppm /℃。结果。没有贴面（控件）的Empress 2 Core光盘没有因制造程序而发生明显偏转。分层光盘的挠曲在制造过程中受到热失配程度的强烈影响。最大的挠度发生在第二次牙本质放电期间，最大的错配为正或负。重要性。挠度测试被证明是评估全陶瓷系统中瓷器热相容性的可靠测试方法。

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