In-vitro study on the accuracy of a simple-design CT-guided stent for dental implants
허영준, 최보람, 허경회, 이원진, 허민석, 이삼선, 최순철,
소속 상세정보
허영준 ( Huh Young-June ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
최보람 ( Choi Bo-Ram ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
허경회 ( Huh Kyung-Hoe ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
이원진 ( Yi Won-Jin ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
허민석 ( Heo Min-Suk ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
이삼선 ( Lee Sam-Sun ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
최순철 ( Choi Soon-Chul ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Radiology
KMID : 1024020120420030139
Abstract
Purpose: An individual surgical stent fabricated from computed tomography (CT) data, called a CT-guided stent, would be useful for accurate installation of implants. The purpose of the present study was to introduce a newly developed CT-guided stent with a simple design and evaluate the accuracy of the stent placement.
Materials and Methods: A resin template was fabricated from a hog mandible and a specially designed plastic plate, with 4 metal balls inserted in it for radiographic recognition, was attached to the occlusal surface of the template. With the surgical stent applied, CT images were taken, and virtual implants were placed using software. The spatial positions of the virtually positioned implants were acquired and implant guiding holes were drilled into the surgical stent using a specially designed 5-axis drilling machine. The surgical stent was placed on the mandible and CT images were taken again. The discrepancy between the central axis of the drilled holes on the second CT images and the virtually installed implants on the first CT images was evaluated.
Results: The deviation of the entry point and angulation of the central axis in the reference plane were 0.47±0.27 mm, 0.57±0.23 mm, and 0.64±0.16°, 0.57±0.15°, respectively. However, for the two different angulations in each group, the 20° angulation showed a greater error in the deviation of the entry point than did the 10° angulation.
Conclusion: The CT-guided template proposed in this study was highly accurate. It could replace existing implant guide systems to reduce costs and effort.
키워드
Computer-Assisted Diagnosis; Dental Implant; Tomography; X-Ray Computed; In Vitro
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