Prosthdontic Department, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia.
J Esthet Restor Dent. 2022 Jun;34(4):707-714. doi: 10.1111/jerd.12902. Epub 2022 Mar 16.
To compare the marginal and internal adaptation of endocrowns produced using conventional technique, digital technique, and combination (cast digitization) techniques using microcomputed tomography (micro-CT).
Ten freshly extracted human mandibular molar teeth were prepared for all-ceramic endocrowns. A total of 40 Lithium Disilicate (IPS e.max) endocrowns were fabricated and grouped according to the impression and production technique to four groups: Group (CO): Conventional impression/heat pressed endocrowns (n = 10), Group (CAD): Direct scanning of teeth/CAD-CAM endocrowns (n = 10), Group (COMIO): Combination; Cast digitization using Intraoral scanner/CAD-CAM endocrowns (n = 10), Group (COML): Combination; Cast digitization using laboratory scanner/CAD-CAM endocrowns (n = 10). Micro-computed tomography was used to measure the marginal and internal gaps in 11 predetermined sites. Mean marginal and internal gaps were compared using analysis of variance and Scheffe's post hoc test.
CO, CAD, COMIO, and COML groups showed significant differences in the mean marginal gap (150 ± 35 μm, 120 ± 27 μm, 110 ± 24 μm, 120 ± 29 μm, respectively p = 0.013), gap at line angle (280 ± 70 μm, 130 ± 37 μm, 140 ± 54 μm, 130 ± 33 μm, respectively, p < 0.001), gap at cavity wall (210 ± 76 μm, 140 ± 43 μm, 140 ± 52 μm, 150 ± 44 μm, respectively, p = 0.010) and gap at pulpal floor (500 ± 150 μm, 240 ± 58 μm, 260 ± 59 μm, 240 ± 64 μm, respectively, p < 0.001).
Digitally fabricated endocrowns showed superior marginal and internal fit compared to the conventionally fabricated endocrowns.
Marginal and internal adaptation are detrimental factors for the success and survival of dental restorations including endocrowns. When compared with the conventional impressions and conventional production techniques, Digital workflow is more predictable and reliable as it reduces errors and improves the accuracy of fit.
通过微计算机断层扫描（micro-CT）比较使用传统技术、数字技术和组合（铸造数字化）技术制作的嵌体冠的边缘和内部适应性。
为全瓷嵌体冠制备了 10 颗新鲜提取的下颌磨牙。总共制作了 40 个锂硅玻璃陶瓷（IPS e.max）嵌体冠，并根据印模和生产技术分为四组：组（CO）：传统印模/热压嵌体冠（n=10），组（CAD）：直接扫描牙齿/CAD-CAM 嵌体冠（n=10），组（COMIO）：组合；使用口内扫描仪/CAD-CAM 嵌体冠的铸造数字化（n=10），组（COML）：组合；使用实验室扫描仪/CAD-CAM 嵌体冠的铸造数字化（n=10）。使用微计算机断层扫描测量 11 个预定部位的边缘和内部间隙。使用方差分析和 Scheffe 事后检验比较平均边缘和内部间隙。
CO、CAD、COMIO 和 COML 组的平均边缘间隙（150±35μm、120±27μm、110±24μm、120±29μm，分别 p=0.013）、线角间隙（280±70μm、130±37μm、140±54μm、130±33μm，分别，p<0.001）、腔壁间隙（210±76μm、140±43μm、140±52μm、150±44μm，分别，p=0.010）和牙髓底间隙（500±150μm、240±58μm、260±59μm、240±64μm，分别，p<0.001）有显著差异。
与传统制作的嵌体冠相比，数字化制作的嵌体冠具有更好的边缘和内部适配性。
边缘和内部适应性是包括嵌体冠在内的牙科修复体成功和存活的不利因素。与传统印模和传统生产技术相比，数字化工作流程更具可预测性和可靠性，因为它可以减少误差并提高适配精度。
