Private practice, Athens, Greece.
J Prosthet Dent. 2013 Nov;110(5):389-96. doi: 10.1016/j.prosdent.2013.06.004. Epub 2013 Sep 5.
The predictable nature of the hot pressing ceramic technique has several applications, but no study was identified that evaluated its application to the fabrication of custom implant abutments.
The purpose of this study was to compare the fracture resistance of an experimentally designed pressable metal ceramic custom implant abutment (PR) with that of a duplicate zirconia abutment (ZR).
Two groups of narrow platform (NP) (Nobel Replace) implant abutment specimens were fabricated (n=10). The experimental abutment (PR) had a metal substructure cast with ceramic alloy (Lodestar) and veneered with leucite pressable glass ceramic (InLine PoM). Each PR abutment was individually scanned and 10 duplicate CAD/CAM ZR abutments were fabricated for the control group. Ceramic crowns (n=20) with the average dimensions of a human lateral incisor were pressed with lithium disilicate glass ceramic (IPS e.max Press) and bonded on the abutments with a resin luting agent (Multilink Automix). The specimens were subjected to thermocycling, cyclic loading, and finally static loading to failure with a computer-controlled Universal Testing Machine. An independent t test (1 sided) determined whether the mean values of the fracture load differed significantly (α=.05) between the 2 groups.
No specimen failed during cyclic loading. Upon static loading, the mean (SD) load to failure was significantly higher for the PR group (525.89 [143.547] N) than for the ZR group (413.70 [35.515] N) for internal connection narrow platform bone-level implants (P=.025). Failure was initiated at the screw and internal connection level for both groups.
It is possible to fabricate PR abutments that are stronger than ZR abutments for Nobel Biocare internal connection NP bone-level implants. The screw and the internal connection are the weak links for both groups.
热压陶瓷技术具有多种可预测的应用，但没有发现研究评估其在定制种植体基台制造中的应用。
本研究旨在比较实验设计的可压金属陶瓷定制种植体基台（PR）与复制氧化锆基台（ZR）的抗断裂能力。
制作了两组窄台（NP）（诺贝尔Replace）种植体基台标本（n=10）。实验基台（PR）具有用陶瓷合金（Lodestar）铸造的金属底层结构，并涂覆有透锂长石可压玻璃陶瓷（InLine PoM）。每个 PR 基台均单独扫描，并为对照组制作了 10 个复制 CAD/CAM ZR 基台。用锂硅二硅酸盐玻璃陶瓷（IPS e.max Press）压制具有人类侧切牙平均尺寸的陶瓷冠，并通过树脂粘固剂（Multilink Automix）将其粘接到基台上。将标本进行热循环、循环加载，最后用计算机控制的万能试验机进行静态加载至失效。独立 t 检验（单侧）确定两组之间的断裂负荷平均值是否有显著差异（α=.05）。
没有标本在循环加载过程中失效。在静态加载时，PR 组的平均（SD）失效负荷（525.89 [143.547] N）明显高于 ZR 组（413.70 [35.515] N），用于内部连接窄台骨水平种植体（P=.025）。两组的失效均从螺钉和内部连接水平开始。
对于 Nobel Biocare 内部连接 NP 骨水平种植体，可以制造出比 ZR 基台更强的 PR 基台。螺钉和内部连接是两组的薄弱环节。
