In vitro fit of CAD-CAM complete arch screw-retained titanium and zirconia implant prostheses fabricated on 4 implants
In vitro fit of CAD-CAM complete arch screw-retained titanium and zirconia implant prostheses fabricated on 4 implants
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DOI：
10.1016/j.prosdent.2017.04.023
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发表时间：
2018-03-01
影响因子：
4.6
通讯作者：
Johnston, William M.
中科院分区：
文献类型：
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作者：
AL-Meraikhi, Hadi;Yilmaz, Burak;Johnston, William M.
陈述问题。计算机辅助设计和计算机辅助制造（CAD-CAM）的钛和氧化锆种植体支持的固定种植体假体在4个种植体上已经变得流行。其界面配合的精度和准确性还没有得到广泛的研究。本体外研究的目的是比较氧化锆和钛种植体支持的螺钉固位CAD CAM完全固定义齿（CFDP）与模拟全4种植体分布的标准化模型的边缘适合性。材料和方法。代表无牙上颌骨与4个多单元复制品嵌入在相应的位置上颌骨第一磨牙和犬齿的网站被选中。使用扫描体和实验室扫描仪对多单元基台进行数字扫描。利用CAD软件设计螺钉固位种植体固定的全口义齿框架，并将设计文件送至铣床进行CAM。在4个种植体上研磨钛（n=5）和氧化锆（n=5）框架，并在应用单螺钉测试时使用工业计算机断层扫描（CT）扫描仪扫描框架。重建直接CT扫描以从体素数据集生成标准镶嵌语言（STL）文件，并将其传输到体积图形分析软件，从中提取测量值。测量了种植体位置左上颌尖牙（LMC）、种植体位置右上颌尖牙（RMC）和种植体位置右上颌第一磨牙（RMFM）的相应框架界面与标准上其代表性多单元基台复制品的圆形配合表面。此外，使用0.500 mm色标范围生成彩色图以显示配合表面之间的边缘差异。材料类型（氧化锆或钛）对3D差异测量无显著性（P=.904）。但各组内RMC与RMFM的3D差异测量值有显著性差异（P
Statement of problem. Computer-aided designed and computer-aided manufactured (CAD-CAM) titanium and zirconia implant-supported fixed implant prostheses on 4 implants have become popular. The precision and accuracy of their interface fit has not been widely researched.Purpose. The purpose of this in vitro study was to compare the marginal fit of zirconia and titanium implant-supported screw-retained CAD CAM complete fixed dental prostheses (CFDP) fit with a standardized cast simulating the all-on-4 implant distribution.Material and methods. Representation of an edentulous maxilla with 4 multiunit replicas embedded in sites corresponding to the positions of the maxillary first molars and canines was chosen. Multiunit abutments were digitally scanned using scan bodies and a laboratory scanner. CAD software was used to design screw-retained implant-fixed complete prostheses framework, and the file was sent to a milling machine for CAM. Titanium (n=5) and zirconia (n=5) frameworks were milled on 4 implants, and the frameworks were scanned with an industrial computed tomography (CT) scanner while applying the 1-screw test. The direct CT scans were reconstructed to generate a standard tessellation language (STL) file from the voxel data set and transported to volume graphics analysis software from which measurements were extracted. The circular mating surfaces of the corresponding framework interfaces to their representative multiunit abutment replicas on the standard were measured for implant position left maxillary canine (LMC), implant position right maxillary canine (RMC) and implant position right maxillary first molar (RMFM). In addition, color maps were generated to show the marginal discrepancy between the mating surfaces using 0.500 mm color scale ranges.Results. The material type (zirconia or titanium) was not significant for 3D discrepancy measurements (P=.904). However, 3D discrepancy measurement values were significantly different between RMC and RMFM within each group (P