Accuracy of implant according to support type of dental implant surgical guides: A retrospective study

Im, Kyung-Min; Sung, Gi-Won; Cha, Ho-Young; Kim, Chul-Hoon; Kim, Bok-Joo; Kim, Jung-Han; Kang, Sun-Woo

doi:2026.64.10.359

J Korean Dent Assoc > Volume 64(10); 2026 > Article

Original Article

Journal of Korean Dental Association 2026;64(10):359-366.
DOI: https://doi.org/10.22974/jkda.2026.64.10.002 Published online October 30, 2026.

치과용 임플란트 수술용 가이드의 지지방식에 따른 임플란트 식립의 정확도 평가: 후향적 연구

Accuracy of implant according to support type of dental implant surgical guides: A retrospective study

Kyung-Min Im¹

¹Department of Oral and Maxillofacial Surgery, College of Medicine, Dong-A University, Busan, Korea
²Department of Prosthodontics, College of Medicine, Dong-A University, Busan, Korea

Correspondence: Sun-Woo Kang, Tel: +82-51-240-5470,
Email: kalisto002@dau.ac.kr

Received: 31 May 2026 • Revised: 8 October 2026 • Accepted: 15 October 2026

Abstract

Purpose
This study evaluated the influence of surgical guide support type on implant placement accuracy by comparing planned and actual implant positions.
Materials and Methods
Thirty-two patients who underwent guided implant surgery between January 2024 and April 2026 were included. 136 implants were analyzed: 60 in 9 edentulous patients and 76 in 23 partially edentulous patients. CAD/CAM surgical guides were fabricated using preoperative CBCT and intraoral scan data. Postoperative CBCT images were superimposed on planning data to measure coronal, apical, depth, and angular deviations. Guides were classified as tooth-supported or tissue-supported, with tooth-supported guides further categorized as unilateral or bilateral. Implant sites were classified as anterior, premolar, or molar.
Results
Tooth-supported guides showed lower coronal and apical deviations than tissue-supported guides (1.48 ± 0.09 vs. 1.95 ± 0.14 mm, p = 0.006; 1.85 ± 0.12 vs. 2.28 ± 0.15 mm, p = 0.030). Depth and angular deviations did not differ significantly. No significant differences were found between unilateral and bilateral tooth-supported designs. Implant location did not affect coronal, apical, or depth deviations but affected angular deviation. In tooth-supported guides, molar implants showed greater angular deviation than premolar implants (p = 0.031), whereas in tissue-supported guides, anterior implants showed greater angular deviation than premolar and molar implants.
Conclusion
Tooth-supported surgical guides provided greater implant placement accuracy than tissue-supported guides, particularly for coronal and apical deviations. Guide stability and implant site characteristics should be considered to improve the accuracy and predictability of guided implant surgery.

Key Words: Dental Implants; Computer-Aided Surgery; Treatment Outcome