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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of denture tooth movement between CAD-CAM and conventional fabrication techniques
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Comparison of denture tooth movement between CAD-CAM and conventional fabrication techniques

机译：CAD-CAM与常规制造技术之间的假牙齿移动的比较

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Abstract Statement of problem Data comparing the denture tooth movement of computer-aided design and computer-aided manufacturing (CAD-CAM) and conventional denture processing techniques are lacking. Purpose The purpose of this in?vitro study was to compare the denture tooth movement of pack-and-press, fluid resin, injection, CAD-CAM-bonded, and CAD-CAM monolithic techniques for fabricating dentures to determine which process produces the most accurate and reproducible prosthesis. Material and methods A total of 50 dentures were evaluated, 10 for each of the 5 groups. A master denture was fabricated and milled from prepolymerized poly(methyl methacrylate). For the conventional processing techniques (pack-and-press, fluid resin, and injection) a polyvinyl siloxane putty mold of the master denture was made in which denture teeth were placed and molten wax injected. The cameo surface of each wax-festooned denture was laser scanned, resulting in a standard tessellation language (STL) format file. The CAD-CAM dentures included 2 subgroups: CAD-CAM-bonded teeth in which the denture teeth were bonded into the milled denture base and CAD-CAM monolithic teeth in which the denture teeth were milled as part of the denture base. After all specimens had been fabricated, they were hydrated for 24 hours, and the cameo surface laser scanned. The preprocessing and postprocessing scan files of each denture were superimposed using surface-matching software. Measurements were made at 64 locations, allowing evaluation of denture tooth movement in a buccal, lingual, mesial-distal, and occlusal direction. The use of median and interquartile range values was used to assess accuracy and reproducibility. Levene and Kruskal-Wallis analyses of variance were used to evaluate differences between processing techniques (α=.05). Results The CAD-CAM monolithic technique was the most accurate, followed by fluid resin, CAD-CAM-bonded, pack-and-press, and injection. CAD-CAM monolithic technique was the most reproducible, followed by pack-and-press, CAD-CAM-bonded, injection, and fluid resin. Techniques involving compression during processing showed increased positive occlusal tooth movement compared with techniques not involving compression. Conclusions CAD-CAM monolithic dentures produced the best combination of accuracy and reproducibility of the tested techniques. The results from this study demonstrate that varying amounts of tooth movement can be expected depending on the processing technique. However, the clinical significance of these differences is unknown.
机译：缺乏计算机辅助设计和计算机辅助制造（CAD-CAM）和传统义齿加工技术的义齿牙齿运动的解决方案数据缺乏。目的在体外研究中的目的是比较包装和压力，流体树脂，注射，CAD凸轮键合和CAD-CAM单片技术的牙齿齿移动，用于制造假牙，以确定哪种过程产生最多准确可重复的假体。材料和方法共评价50个义齿，每种5组的10个义齿。从预聚合的聚（甲基丙烯酸甲酯）制造和研磨主义齿。对于常规的加工技术（包装和压制，流体树脂和注射），制备了母义齿的聚乙烯醇硅氧烷腻子模具，其中诱导牙齿并注入熔融蜡。激光扫描每个蜡花义齿的灵感表面，导致标准曲面图语言（STL）格式文件。 CAD-CAM假牙包括2个子组：CAD-CAM键合齿，其中牙本质齿粘合到研磨的义齿基底和CAD-CAM单片齿中，其中义齿齿作为义齿基部的一部分研磨牙齿。在制造所有标本后，将它们水合24小时，并扫描了灵感表面激光。使用表面匹配的软件叠加每个义齿的预处理和后处理扫描文件。在64个位置进行测量，允许评估颊，舌，间距和咬合方向上的义齿齿移动。使用中位数和狭隘范围值的使用来评估准确性和再现性。 Levene和Kruskal-Wallis方差分析用于评估加工技术（α= .05）之间的差异。结果CAD-CAM单片技术是最准确的，其次是流体树脂，CAD-CAM键合，包装和压制和注射。 CAD-CAM单片技术是最重复的，其次是包装，CAD-CAM键合，注射和流体树脂。与不涉及压缩的技术相比，在处理过程中涉及压缩的技术显示出增加的正咬牙齿移动。结论CAD-CAM单片义齿产生了测试技术的准确性和再现性的最佳组合。本研究的结果表明，根据加工技术，可以预期不同量的牙齿运动。然而，这些差异的临床意义是未知的。

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