Department of Restorative Dentistry, School of Dentistry, State University of Londrina, Londrina, PR, Brazil.
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
Clin Implant Dent Relat Res. 2017 Oct;19(5):860-866. doi: 10.1111/cid.12525. Epub 2017 Aug 2.
The biomechanical behavior of implant-supported titanium and zirconia full-arch fixed dental prosthesis (FAFDP) frameworks require further investigation.
Strains transferred by implant-supported titanium (Ti) and zirconia (Zr) FAFDP frameworks were analyzed.
Maxillary 14-unit FAFDPs supported by 6 implants and 12-unit FAFDPs supported by 4 implants were tested. One-piece frameworks were fabricated by computer-aided design/computer-aided manufacturing. Four groups were divided (n = 3): G1, Ti-6 implants; G2, Zr-6 implants; G3, Ti-4 implants; G4, Zr-4 implants. A 250 N single-point load was applied on the second premolar. A three-dimensional digital image correlation system recorded framework and maxilla model surface deformation.
The following strains (μS) averaged over the length of the second premolar were calculated: frameworks, G1 (321.82 ± 111.29), G2 (638.87 ± 108.64), G3 (377.77 ± 28.64), G4 (434.18 ± 132.21); model surface, G1 (473.99 ± 48.69), G2 (653.93 ± 45.26), G3 (1082.50 ± 71.14), G4 (1218.26 ± 230.37). Zirconia frameworks supported by 6 implants (G2) presented higher surface strains (P < .05). FAFDPs with titanium frameworks transferred significantly lower strains to the supporting maxilla when 6 implants were used (G1) (P < .05). Both framework materials transferred similar strains when supported by 4 implants (G3 and G4) (P > .05).
Zirconia frameworks supported by 6 implants showed higher strains. FAFDPs supported by 6 implants transferred less strains to the supporting maxilla, irrespective of framework material.
种植体支持的钛和氧化锆全口固定义齿（FAFDP）修复体的生物力学行为需要进一步研究。
分析种植体支持的钛（Ti）和氧化锆（Zr）FAFDP 修复体框架传递的应变。
测试了由 6 个种植体支持的上颌 14 单位 FAFDP 和由 4 个种植体支持的 12 单位 FAFDP。采用计算机辅助设计/计算机辅助制造制作整体式框架。将试件分为 4 组（n=3）：G1，Ti-6 种植体；G2，Zr-6 种植体；G3，Ti-4 种植体；G4，Zr-4 种植体。在第二前磨牙上施加 250 N 的单点载荷。三维数字图像相关系统记录了框架和上颌模型表面的变形。
计算了第二前磨牙长度上的平均应变（μS）：框架，G1（321.82±111.29），G2（638.87±108.64），G3（377.77±28.64），G4（434.18±132.21）；模型表面，G1（473.99±48.69），G2（653.93±45.26），G3（1082.50±71.14），G4（1218.26±230.37）。6 个种植体支持的氧化锆框架（G2）表现出更高的表面应变（P<.05）。当使用 6 个种植体时，钛框架支持的 FAFDP 向支撑上颌传递的应变显著降低（G1）（P<.05）。当使用 4 个种植体支撑时，两种框架材料传递的应变相似（G3 和 G4）（P>.05）。
6 个种植体支持的氧化锆框架显示出更高的应变。6 个种植体支持的 FAFDP 向支撑上颌传递的应变较少，而与框架材料无关。
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