State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China.
State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Dental Materials, School of Stomatology, Fourth Military Medical University, Xi'an, China.
J Dent. 2024 Oct;149:105322. doi: 10.1016/j.jdent.2024.105322. Epub 2024 Aug 25.
This study aimed to evaluate the accuracy of computer-aided design and computer-aided manufacturing (CAD-CAM)-assisted templates (CCAT), guiding rod templates (GRT), and freehand (FH) preparation of guide planes.
Forty-five identical maxillary resin casts were divided into three groups, in which the guide planes of the two abutment teeth were prepared using a CCAT (n=15), GRT (n=15), and FH (n=15). The CCAT and GRT were digitally designed on a digital cast of virtually prepared guide planes and fabricated using three-dimensional printing (3DP) technology. To assess the 3D trueness, the prepared guide planes were digitally scanned and compared to the virtually designed guide planes. The angle deviation was measured to assess the trueness of the direction of the guide plane preparation. Shapiro-Wilk and Levene's tests were used to check the normality and equivalence of the variance of the data. The data were compared by using the Kruskal‒Wallis H test (α=0.05).
The CCAT group exhibited significantly better 3D trueness (78.5±19.8 μm) than the GRT group (211.3±42.4 μm, p<0.05) and the FH group (198.9±44.3 μm, p<0.05). Additionally, the CCAT group (1.31±0.50°) showed significantly smaller direction trueness compared to the GRT (4.65±0.72°, p<0.05) and FH (5.64±0.70°, p<0.05) groups.
The novel CAD-CAM-assisted template significantly improved the quality of the guide planes compared with the GRT and FH procedures. This enhancement suggests that removable partial dentures can be predictably inserted immediately after guide plane preparation.
CAD-CAM-assisted templates improve the quality of guide plane preparation.
本研究旨在评估计算机辅助设计和计算机辅助制造（CAD-CAM）辅助模板（CCAT）、引导杆模板（GRT）和徒手（FH）制备导平面的准确性。
将 45 个相同的上颌树脂模型分为三组，其中使用 CCAT（n=15）、GRT（n=15）和 FH（n=15）制备两个基牙的导平面。CCAT 和 GRT 是在虚拟制备的导平面的数字模型上进行数字设计的，并使用三维打印（3DP）技术制造。为了评估 3D 准确性，对制备的导平面进行数字扫描，并与虚拟设计的导平面进行比较。测量角度偏差以评估导平面制备方向的准确性。使用 Shapiro-Wilk 和 Levene 检验检查数据的正态性和方差的等效性。使用 Kruskal-Wallis H 检验（α=0.05）比较数据。
CCAT 组的 3D 准确性明显优于 GRT 组（211.3±42.4 μm，p<0.05）和 FH 组（198.9±44.3 μm，p<0.05）。此外，CCAT 组（1.31±0.50°）的方向准确性明显小于 GRT 组（4.65±0.72°，p<0.05）和 FH 组（5.64±0.70°，p<0.05）。
与 GRT 和 FH 程序相比，新型 CAD-CAM 辅助模板显著提高了导平面的质量。这种改进表明，导平面制备后可立即预测性地插入可摘局部义齿。
CAD-CAM 辅助模板可提高导平面制备的质量。
