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J Korean Acad Prosthodont. 2019 Jul;57(3):219-224. English. Original Article.
Mai HY , Lee DH .
Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Institute for Translational Research in Dentistry, Kyungpook National University, Daegu, Republic of Korea.


The image registration of radiographic image and digital surface data is essential in the computer-guided implant guide system. The purpose of this study was to examine the effects of using micro-screw on the working time and convenience of operators in the process of image matching for guided implant surgery.

Materials and methods

A mandibular dental model was prepared in partial edentulism for Kennedy class I classification. Two micro-screws were placed on the each side of retromolar area. Radiographic and scan images were taken using computed-tomography and digital scanning. The images were superimposed by 12 operators in software in two different conditions: using remaining teeth image alone and using teeth and micro-screws images. Working time, operator convenience and satisfaction were obtained, and analyzed using the Mann-Whitney U test (α=.05).


The working time was not statistically different between image registration conditions (P>.05); however, operator convenience and satisfaction were higher in the teeth and micro-screw assisted condition than in the teeth-alone assisted condition (P<.001).


The use of microscrew for the image registration has no effect in working time reduction, but improves operator convenience and satisfaction.

Copyright © 2019. Korean Association of Medical Journal Editors.