Dimensional changes of buccal bone in the edentulous maxilla with telescopic-retained implant-supported fixed dental prostheses.
Dimensional changes of buccal bone in the edentulous maxilla with telescopic-retained implant-supported fixed dental prostheses.
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使用伸缩式固位种植体支持的固定假牙时无牙颌上颌颊骨的尺寸变化。
DOI：
10.1016/j.prosdent.2021.08.006
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发表时间：
2021
期刊：
影响因子：
4.6
通讯作者：
Yajima Y.
中科院分区：
文献类型：
--
作者：
Oda Y;Mori G;Sasaki H;Furuya Y;Ito T;Iijima T;Sekine H;Yajima Y.
由于生理变化，无牙上颌骨的颊骨会随着时间的推移而变薄。然而，在这方面，无牙上颌骨在种植体支持的固定义齿修复后颊骨的尺寸变化尚不清楚。目的本回顾性临床研究的目的是评估无牙上颌骨在全弓套筒冠固位种植体支持的固定义齿修复后颊骨尺寸变化的锥形束计算机断层扫描（CBCT）图像（CTI-FDP）6年后，通过使用一个专业的检索system.Material和methodsThis研究包括17名参与者与无牙上颌骨谁已提供了CTI-FDP与121锥形联合种植体。在种植体插入时（0年）和6年后使用CBCT进行三维影像学分析。评价垂直和水平骨测量值。在水平骨厚度测量期间，将4个不同水平（距种植体肩顶0、2、4和6 mm）分别评价为骨值（BV）0 mm、BV 2 mm、BV 4 mm和BV 6 mm。采用Wilcoxon符号秩检验和Kruskal-Wallis检验（α= 0.05）比较BV。此外，使用斯皮尔曼等级相关系数确定影响6 yBV的0 yBV因素。结果0 ~ 6岁儿童垂直和水平方向的BV值均显著降低（P <0. 05），6岁儿童垂直和水平方向的BV值均显著降低（P<0. 05）。然而，在任何垂直和水平测量点，6年时的骨丢失均无显著差异（P≥.05）。当分析与6 yBV 0 mm相关的0 yBV时，0 yBV 0 mm和0 yBV 2 mm显示出与6 yBV 0 mm的强相关性（|R| ≥.7）。在回归分析中，0 yBV 0 mm为0.58 mm和0 yBV 2 mm为0.78 mm可能是与6 yBV 0 mm为0 mm相关的关键因素，0 yBV 0 mm大于0.58 mm的6 yBV 0 mm显著高于0 yBV 0 mm小于0.58 mm的6 yBV 0 mm（P<0.001）。此外，0 yBV 2 mm的6 yBV 0 mm大于0.78 mm明显高于0 yBV 2 mm的6 yBV 0 mm小于0.78 mm（P<.001）。结论6年后，安装固定种植体支持修复体的无牙上颌骨的颊骨垂直和水平骨厚度明显减少。在种植体插入时，平台上的0.58 mm颊骨和种植体肩顶2 mm处的0.78 mm颊骨对于长期维持专门支持CTI-FDP的种植体平台上的骨是必要的。
Statement of problemThe buccal bone in an edentulous maxilla loses thickness over time because of physiological changes. However, the dimensional changes of the buccal bone in an edentulous maxilla with an implant-supported fixed dental prosthesis are unknown.PurposeThe purpose of this retrospective clinical study was to evaluate cone beam computed tomography (CBCT) images of the dimensional changes of the buccal bone in edentulous maxillae with complete arch telescopic-retained implant-supported fixed dental prostheses (CTI-FDPs) after 6 years by using a professional retrieval system.Material and methodsThis study included 17 participants with edentulous maxillae who had been provided with CTI-FDP with 121 taper joint implants. A three-dimensional radiographic analysis by using CBCT was performed at implant insertion (0 years) and after 6 years. Vertical and horizontal bone measurement values were evaluated. During horizontal bone thickness measurement, 4 different levels, 0, 2, 4, and 6 mm apical to the implant shoulder, were evaluated as bone value (BV)0mm, BV2mm, BV4mm, and BV6mm, respectively. The BVs were compared with the Wilcoxon signed-rank test and Kruskal-Wallis test (α=.05). In addition, the Spearman rank correlation coefficient was used to identify 0yBV factors that influence the 6yBVs. A nonlinear regression analysis was used to clarify the slopes of 0yBVs and 6yBV0mm.ResultsSignificant decreases in vertical and horizontal BVs were found between 0 years and 6 years (P<.05). However, no significant difference was observed in bone loss at 6 years at any of the vertical and horizontal measurement points (P≥.05). When 0yBVs related to 6yBV0mmwere analyzed, 0yBV0mmand 0yBV2mmshowed strong correlations with 6yBV0mm(|r|≥.7). In the regression analysis, a 0yBV0mmof 0.58 mm and 0yBV2mmof 0.78 mm could be critical factors associated with a 6yBV0mmof 0 mm. A 6yBV0mmof 0yBV0mmmore than 0.58 mm was significantly higher than a 6yBV0mmof 0yBV0mmless than 0.58 mm (P<.001). Moreover, a 6yBV0mmof 0yBV2mmmore than 0.78 mm was significantly higher than a 6yBV0mmof 0yBV2mmless than 0.78 mm (P<.001).ConclusionsThe buccal bone in an edentulous maxilla with fixed implant-supported prostheses lost significant vertical and horizontal bone thicknesses after 6 years. At implant insertion, both a 0.58-mm buccal bone on the platform and a 0.78-mm buccal bone at 2 mm apical to the implant shoulder are necessary for longer term maintenance of bone on the platform of implants specifically supporting CTI-FDPs.
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