Kaenploy Jekita, Li Rui, Makowka Steven, Sadid-Zadeh Ramtin
Department of Restorative Sciences, College of Dentistry, University of Oklahoma, Oklahoma City, Oklahoma, USA.
Department of Restorative Dentistry, School of Dental Medicine, University at Buffalo, Buffalo, New York, USA.
J Prosthodont. 2024 May 28. doi: 10.1111/jopr.13871.
This study compared the fracture strength of single lithium disilicate implant-supported crowns fabricated on two-piece abutments with various materials: ceramic-reinforced PEEK, zirconia, and lithium disilicate.
Thirty-six implants were embedded in acrylic cylinders. A two-piece abutment and a crown were designed following a pre-operation scan for a maxillary left central incisor. The designed crown was used to fabricate 36 lithium disilicate crowns. The designed abutment was used to manufacture 36 abutments from 3 materials, 12 each: (A) zirconia; (B) lithium disilicate; and (C) ceramic-reinforced PEEK. Abutments were surface treated and bonded on the titanium base abutments with resin cement. Then, lithium disilicate crowns were bonded on the assigned abutments. Specimens were then subjected to dynamic loading for 1,200,000 cycles. The fracture strength (N) of the assembly was assessed using a universal testing machine. One-way ANOVA followed by multiple comparison tests was used to evaluate the effect of abutment material on the fracture strength of single implant-supported restorations at a significance of .05.
The average fracture strength for the groups with zirconia, PEEK, and lithium disilicate two-piece abutments were 1362N ± 218N, 1235N ± 115N, and 1472N ± 171N, respectively. There was a significant (p < 0.05) difference in fracture strength among the groups. The lithium disilicate group had significantly higher fracture strength (p = 0.0058) than the group with PEEK; however, there was no significant (p > 0.05) difference between the other groups.
Two-piece abutments restored with lithium disilicate crowns investigated in the study have the potential to withstand the average physiological occlusal forces in the anterior region.
本研究比较了用不同材料（陶瓷增强聚醚醚酮、氧化锆和二硅酸锂）制作的两件式基台上的单颗二硅酸锂种植体支持冠的断裂强度。
将36颗种植体植入丙烯酸圆柱体中。对上颌左中切牙进行术前扫描后设计两件式基台和牙冠。用设计好的牙冠制作36颗二硅酸锂牙冠。用设计好的基台由3种材料制作36个基台，每种材料12个：（A）氧化锆；（B）二硅酸锂；（C）陶瓷增强聚醚醚酮。对基台进行表面处理，并用树脂粘结剂粘结在钛基台上。然后，将二硅酸锂牙冠粘结在指定的基台上。接着对样本进行120万次动态加载。使用万能试验机评估组件的断裂强度（牛顿）。采用单因素方差分析和多重比较检验来评估基台材料对单颗种植体支持修复体断裂强度的影响，显著性水平为0.05。
氧化锆、聚醚醚酮和二硅酸锂两件式基台组的平均断裂强度分别为1362N±218N、1235N±115N和1472N±171N。各组之间的断裂强度存在显著差异（p<0.05）。二硅酸锂组的断裂强度显著高于聚醚醚酮组（p = 0.0058）；然而，其他组之间没有显著差异（p>0.05）。
本研究中用二硅酸锂牙冠修复的两件式基台有潜力承受前部区域的平均生理咬合力。
