种植体位置和角度对下颌双种植体覆盖义齿固位强度的影响：采用新型3D打印模拟方法的体外研究
Effect of Implant Positions and Angulations on Retentive Strength of 2-Implant Mandibular Overdentures: An In Vitro Study with the New 3D-Printed Simulation Method.
作者信息
Patil Pravinkumar G, Seow Liang Lin, Uddanwadikar Rashmi, Pau Allan, Ukey Piyush D
机构信息
Division of Restorative Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia.
Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India.
出版信息
Int J Dent. 2022 Sep 14;2022:7052955. doi: 10.1155/2022/7052955. eCollection 2022.
OBJECTIVES
To evaluate the retentive strength of overdenture attachments in 2-implant mandibular overdenture (2IMO) with implants placed at different positions and angulations.
MATERIALS AND METHODS
Edentulous mandibular models were 3D-printed using CBCT images and Materialise Mimics software and the denture models using the intraoral scanner. Two standard implants were placed parallel at different positions from midline (5, 10, 15, and 20 mm) with 0-0 degree angulations and with different distal angulations (0-5, 0-10, 0-15, 5-5, 10-10, and 15-15 degrees) at 10±mm from midline representing 10 study groups. Low-profile male attachments were attached to the implants and the female pink attachments were picked up in the denture. A total of 4 simulated overdenture model sets for each of the 10 study groups were subjected to the universal testing machine thrice to measure a peak load (N) to disengage the attachments vertically. Data were analyzed using one-way ANOVA and Tukey's post hoc test at 0.05 significance level.
RESULTS
Varying implant positions had a statistically significant effect on the retentive strengths of the attachments ( = 5.61, = 0.002). Peak load-to-dislodgement values (in increasing order) were 49.64 ± 8.27 N for 5 mm, 53.26 ± 11.48 N for 10 mm, 60.24 ± 12.31 N for 15 mm, and 64.80 ± 6.78 N for 20 mm groups. The retentive strength of the 20 mm group was significantly higher than 5 mm ( = 0.003) and 10 mm ( = 0.03) groups. Varying implant angulations had a significant effect on the retentive strengths of the attachments ( = 7.412, = 0.000). The peak load-to-dislodgement values (in increasing order) were 48.20 ± 15.59 N for 5-5 degrees, 53.26 ± 11.48 N for 0-0 degrees, 54.96 ± 8.25 N for 0-5 degrees, 57.71 ± 7.62 N for 10-10 degrees, 66.00 ± 17.54 N for 15-15 degrees, 66.18 ± 14.09 N for 0-10 degrees, and 77.38 ± 10.33 N for 0-15 degrees. Retentive strength of 0-15 degrees was significantly ( < 0.05) higher than those of 0-0, 0-5, 5-5, and 10-10 degrees and that of 5-5 degrees was significantly ( < 0.05) lower than those of 0-10, 0-15, and 15-15 groups.
CONCLUSIONS
Retentive strength of the 2IMO increased with increase in distance of implants from midline and increased with increase in distal angulations.
目的
评估在下颌双种植覆盖义齿（2IMO）中，种植体置于不同位置和角度时覆盖义齿附着体的固位强度。
材料与方法
使用CBCT图像和Materialise Mimics软件3D打印无牙下颌模型，并用口内扫描仪制作义齿模型。将两颗标准种植体平行放置在距中线不同位置（5、10、15和20 mm），角度为0 - 0度，以及在距中线10±mm处设置不同的远中角度（0 - 5、0 - 10、0 - 15、5 - 5、10 - 10和15 - 15度），共代表10个研究组。将低矮型阳性附着体连接到种植体上，阴性粉色附着体安装在义齿中。对10个研究组中的每一组共4个模拟覆盖义齿模型进行三次万能试验机测试，以测量垂直分离附着体的峰值载荷（N）。使用单因素方差分析和Tukey事后检验在0.05显著性水平下分析数据。
结果
种植体位置不同对附着体的固位强度有统计学显著影响（F = 5.61，P = 0.002）。垂直脱位的峰值载荷值（升序排列），5 mm组为49.64±8.27 N，10 mm组为53.26±11.48 N，15 mm组为60.24±12.31 N，20 mm组为64.80±6.78 N。20 mm组的固位强度显著高于5 mm组（P = 0.003）和10 mm组（P = 0.03）。种植体角度不同对附着体的固位强度有显著影响（F = 7.412，P = 0.000）。垂直脱位的峰值载荷值（升序排列），5 - 5度组为48.20±15.59 N，0 - 0度组为53.26±11.48 N，0 - 5度组为54.96±8.25 N，10 - 10度组为57.71±7.62 N，15 - 15度组为66.00±17.54 N，0 - 10度组为66.18±14.09 N，0 - 15度组为77.38±10.33 N。0 - 15度的固位强度显著高于（P < 0.05）0 - 0、0 - 5、5 - 5和10 - 10度组，5 - 5度的固位强度显著低于（P < 0.05）0 - 10、0 - 15和15 - 15度组。
结论
2IMO的固位强度随着种植体距中线距离的增加而增加，并且随着远中角度的增加而增加。
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