Fiore Adolfo Di, Monaco Carlo, Brunello Giulia, Granata Stefano, Stellini Edoardo, Yilmaz Burak
Department of Neurosciences, School of Dentistry, Section of Prosthodontics and Digital Dentistry, University of Padova, Padova, Italy.
Division of Prosthodontics and Maxillofacial Rehabilitation, Department of Biomedical and Neuromotor Sciences (DIBINEM), Alma Mater Studiorum - University of Bologna, Bologna, Italy.
J Prosthodont. 2021 Feb;30(2):104-110. doi: 10.1111/jopr.13268. Epub 2020 Oct 13.
Reconstructing the occlusal morphology of posterior teeth in definitive dental prosthesis can be challenging. The use of the correlation technique enables replication of the information and occlusal anatomy of interim dental prostheses to the definitive ones. The purpose of this controlled clinical trial was to compare the static and dynamic contacts (SDC) of monolithic zirconia crowns designed with correlation and library techniques.
Twenty-four patients were included in the study for a total of 28 molars. For each abutment tooth, an interim crown was fabricated and two digital scans, with and without the interim crown in place were made. Two single crowns were designed using correlation and library techniques. Fifty-six monolithic zirconia crowns were milled. The interim and definitive crowns were evaluated intraorally for SDC by using a 24-μm-thick blue articulating foil. After removing the interim and definite crowns, extraoral photographs were taken to calculate the SDC area using software (ImageJ) and analyzed by the Kruskal-Wallis test.
The average and ± standard deviation (SD) of area of the occlusal marks on interim crowns was 32.27 ± 3.45 mm . Definitive crowns designed by using the correlation technique had an area of 31.01 ± 3.73 mm ; the area in the library technique was 36.85 ± 5.78 mm . No statistically significant difference was found (p = 0.091) between the occlusal mark areas of the interim and definitive crowns designed by using the correlation technique. Whereas, there were significant differences between the areas of occlusal marks of the interim and definitive crowns designed by using the library technique, and between the areas of occlusal marks of definitive crowns designed by using the correlation and library techniques (p < 0.001).
The average area of the SDC of monolithic zirconia crowns designed by using the correlation technique was similar to that of interim crowns. The library technique was less effective when replicating the SDC compared to the correlation technique.
在确定性牙修复体中重建后牙的咬合形态可能具有挑战性。使用关联技术能够将临时牙修复体的信息和咬合解剖结构复制到确定性修复体上。本对照临床试验的目的是比较采用关联技术和数据库技术设计的整体式氧化锆全冠的静态和动态接触（SDC）情况。
本研究纳入了24例患者，共28颗磨牙。为每颗基牙制作一个临时全冠，并进行两次数字化扫描，一次是在佩戴临时全冠的情况下，另一次是在未佩戴临时全冠的情况下。使用关联技术和数据库技术设计了两个单冠。共制作了56个整体式氧化锆全冠。使用24μm厚的蓝色咬合箔在口内对临时全冠和确定性全冠进行SDC评估。在取下临时全冠和确定性全冠后，拍摄口外照片，使用软件（ImageJ）计算SDC面积，并通过Kruskal-Wallis检验进行分析。
临时全冠上咬合痕迹面积的平均值和±标准差（SD）为32.27±3.45mm²。采用关联技术设计的确定性全冠面积为31.01±3.73mm²；数据库技术设计的面积为36.85±5.78mm²。采用关联技术设计的临时全冠和确定性全冠的咬合痕迹面积之间未发现统计学显著差异（p = 0.091）。然而，采用数据库技术设计的临时全冠和确定性全冠的咬合痕迹面积之间，以及采用关联技术和数据库技术设计的确性全冠的咬合痕迹面积之间存在显著差异（p < 0.001）。
采用关联技术设计的整体式氧化锆全冠的SDC平均面积与临时全冠相似。与关联技术相比，数据库技术在复制SDC方面效果较差。
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