Ali Abd Elsalam Awad, Habib Ahmed, Shady Mohamed
Prosthodontics Department, Faculty of Dentistry, Mansoura University, El Gomhoria street, Mansoura, 35516, Egypt.
BMC Oral Health. 2025 May 5;25(1):686. doi: 10.1186/s12903-025-05918-2.
This study aimed to evaluate two different construction techniques (conventional and 3D-printed techniques) for two implant-retained complete mandibular overdentures regarding mechanical wear of the occlusal surface using 3D digital analysis and occlusion force distribution using the digital occlusal analysis system (Occlusense).
Twenty patients were selected for this study from the prosthetic department, Faculty of Dentistry, Mansoura University. Each patient received two implants in the mandibular canine areas with locator attachments to retain the overdentures. According to the overdenture construction technique, all patients were randomly divided into two equal groups: the conventional heat polymerized overdenture group and the 3D-printed overdenture group. The mandibular overdentures were compared and evaluated immediately and after 12 months of insertion regarding mechanical wear of the occlusal surface using 3D digital analysis and occlusal force distribution using a digital occlusal analysis system (Occlusense).
3d printed group showed significantly higher occlusal surface wear than conventional group after twelve months (T12) with a p value ≤ 0.05. 3d printed group showed significantly more occlusal force distribution than conventional group with a p value ≤ 0.05. Also, there was a significant difference in occlusal force distribution with advance of time for each group, with a p value ≤ 0.05 level of significance.
Within the limitations of this study, it was shown that implant overdentures constructed by 3D-printing techniques offer a promising results in distribution of occlusal forces for achieving occlusal equilibration. However, in term of wear resistance more developments need to be done to improve material properties.
The study was approved by the local ethical committee of the Faculty of Dentistry, Mansoura University (No. A02060922) (6/9/2022) and retrospectively registered at ClinicalTrials.gov (ClinicalTrials.gov Identifier NCT06139003) (16/11/2023).
本研究旨在使用3D数字分析评估两种不同的种植体支持的全下颌覆盖义齿的制作技术（传统技术和3D打印技术）在咬合面机械磨损方面的情况，并使用数字咬合分析系统（Occlusense）评估咬合力量分布。
从曼苏拉大学牙科学院修复科选取20名患者进行本研究。每位患者在下颌尖牙区植入两颗种植体，并使用定位器附件来固定覆盖义齿。根据覆盖义齿制作技术，所有患者被随机分为两组，每组人数相等：传统热固化覆盖义齿组和3D打印覆盖义齿组。使用3D数字分析评估下颌覆盖义齿在插入后即刻以及12个月后的咬合面机械磨损情况，并使用数字咬合分析系统（Occlusense）评估咬合力量分布情况。
12个月后（T12），3D打印组的咬合面磨损明显高于传统组，p值≤0.05。3D打印组的咬合力量分布明显多于传统组，p值≤0.05。此外，每组的咬合力量分布随时间推移存在显著差异，p值≤0.05，具有统计学意义。
在本研究的局限性范围内，结果表明，采用3D打印技术制作的种植覆盖义齿在实现咬合平衡的咬合力量分布方面具有良好前景。然而，在耐磨性方面，还需要进一步改进材料性能。
本研究经曼苏拉大学牙科学院当地伦理委员会批准（编号A02060922）（2022年9月6日），并在ClinicalTrials.gov上进行了回顾性注册（ClinicalTrials.gov标识符NCT06139003）（2023年11月16日）。
