Impact of Cantilever Length on the Accuracy of Static CAIS in Posterior Distal Free-End Regions

IF 3.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Clinical Implant Dentistry and Related Research Pub Date : 2025-03-25 DOI:10.1111/cid.70020

Marina Miyashita, Narit Leepong, Polathep Vichitkunakorn, Srisurang Suttapreyasri

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Abstract

Background

Implant placement accuracy in the distal free-end posterior region is often compromised, increasing the risk of damage to adjacent anatomical structures and negatively affecting restoration function, occlusal loading, and aesthetics.

Objectives

This study aimed to assess the accuracy of implant placement using static computer-assisted implant surgery (CAIS) in the posterior distal free-end partially edentulous area with varying cantilever lengths and to evaluate the correlation between cantilever length and implant deviations.

Materials and Methods

A prospective observational study involved 40 patients with 72 posterior implant sites, divided into three groups: 1-unit cantilever (1-UC; distal free-end with a mesial neighboring tooth), 2-unit cantilever (2-UC; one-tooth space from the mesial neighboring tooth), and control (single-tooth space with both mesial and distal neighboring teeth). Implants were placed using fully guided static CAIS, and accuracy was assessed by comparing angular and linear deviations at the implant platform and apex using post-operative CBCT scans. The correlation between cantilever length and implant deviations was analyzed.

Results

The 2-UC group exhibited significantly higher angular deviations (5.01° ± 2.41°) compared to the 1-UC (3.60° ± 1.92°, p = 0.033) and control groups (2.62° ± 1.13°, p < 0.001). The 3D deviations at both the platform and apex were also significantly greater in the 2-UC group (1.15 ± 0.38 mm, 1.74 ± 0.53 mm, respectively) than in the 1-UC (0.86 ± 0.35 mm, p = 0.001; 1.30 ± 0.47 mm, p = 0.002) and control groups (0.72 ± 0.30 mm, p < 0.001; 1.04 ± 0.38 mm, p < 0.001). Deviations in the cantilever groups predominantly trended towards the buccal and apical directions. Additionally, positive correlations were found between cantilever length and implant deviations at both the platform (R = 0.306, p = 0.034) and apex levels (R = 0.294, p = 0.042).

Conclusion

Cantilever length in posterior implant positions significantly affects the accuracy of implant placement using static CAIS. Implants positioned at a 2-unit cantilever or with lengths exceeding 10 mm are more prone to deviating from the planned positions.

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悬臂长度对后端游离端静态CAIS精度的影响

在远端游离端后牙区植入的准确性经常受到损害，增加了相邻解剖结构损伤的风险，并对修复功能、咬合负荷和美观产生负面影响。目的本研究旨在评估在不同悬臂长度的后远端游离部分无牙区使用静态计算机辅助种植手术（CAIS）放置种植体的准确性，并评估悬臂长度与种植体偏差的相关性。材料和方法一项前瞻性观察性研究纳入了40例72个后路种植体位置的患者，分为三组：1单元悬臂（1-UC）；远端自由端具一中端邻近牙齿)，2单元悬臂(2-UC；与近中邻牙的单齿间距)和对照（与近中邻牙和远中邻牙的单齿间距）。使用完全引导的静态CAIS放置植入物，并通过术后CBCT扫描比较植入物平台和尖端的角度和线性偏差来评估准确性。分析了悬臂梁长度与种植体偏差的相关性。结果2-UC组的角度偏差（5.01°±2.41°）明显高于1-UC组（3.60°±1.92°，p = 0.033）和对照组（2.62°±1.13°，p < 0.001）。2-UC组的平台和尖端的三维偏差（分别为1.15±0.38 mm, 1.74±0.53 mm）也显著大于1-UC组（0.86±0.35 mm, p = 0.001）；1.30±0.47毫米,p = 0.002)和对照组(0.72±0.30毫米,p & lt; 0.001;1.04±0.38 mm, p < 0.001)。在悬臂组的偏差主要倾向于口腔和根尖方向。此外，在平台（R = 0.306, p = 0.034）和顶点水平（R = 0.294, p = 0.042），悬臂长度与种植体偏差呈正相关。结论种植体后位悬臂长度对静态CAIS种植体定位精度有显著影响。放置在2单元悬臂或长度超过10mm的植入物更容易偏离计划位置。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Clinical Implant Dentistry and Related Research 医学-牙科与口腔外科

CiteScore

6.00

自引率

13.90%

发文量

103

审稿时长

4-8 weeks

期刊介绍： The goal of Clinical Implant Dentistry and Related Research is to advance the scientific and technical aspects relating to dental implants and related scientific subjects. Dissemination of new and evolving information related to dental implants and the related science is the primary goal of our journal. The range of topics covered by the journals will include but be not limited to: New scientific developments relating to bone Implant surfaces and their relationship to the surrounding tissues Computer aided implant designs Computer aided prosthetic designs Immediate implant loading Immediate implant placement Materials relating to bone induction and conduction New surgical methods relating to implant placement New materials and methods relating to implant restorations Methods for determining implant stability A primary focus of the journal is publication of evidenced based articles evaluating to new dental implants, techniques and multicenter studies evaluating these treatments. In addition basic science research relating to wound healing and osseointegration will be an important focus for the journal.