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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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.