Use of three points to determine the accuracy of guided implantation

Autoři: Ye Liang aff001;  ShanShan Yuan aff002;  JingJing Huan aff001;  HuiXin Wang aff001;  YiYi Zhang aff001;  ChangYun Fang aff001;  Jia-Da Li aff003
Působiště autorů: Department of Stomatology, Xiangya Hospital of Central South University, Changsha, Hunan Province, China aff001;  Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China aff002;  School of Life Sciences, Central South University, Changsha, Hunan Province, China aff003
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article



'This study aims to establish an open-source algorithm using Python to analyze the accuracy of guided implantation, which simplifies interstudy comparisons.


Given ≥3 landmark pairs, this Tri-Point (TriP) method can register images. With ≥4 landmark pairs, TriP can calculate system errors for image registration. We selected 8 indicators from the literature. Considering development errors in new bone on cone beam computed tomography (CBCT), we added the indicators of apical rectified deviation (ARD) and coronal rectified deviation (CRD), providing accurate references but neglecting depth deviations. Our program can calculate and output these indicators. To evaluate the TriP method’s feasibility, an implantation group assisted by a Visual Direction-INdicating Guide (VDING) was analyzed. Accuracy was measured with the traditional and proposed TriP methods. Factors affecting the system error of the method were then analyzed.


Comparisons with paired-sample t-tests showed that our TriP method was similar to the traditional method in evaluating implantation accuracy, with no significant difference (P>0.05). The average system error was 0.30±0.10 mm when the TriP method evaluated the VDING template. The results showed that increasing the provided landmarks from 4 to 5 pairs decreased the between-group differences significantly (P<0.05). With ≥6 pairs of landmarks, the system error tended to be stable, and the groups showed no statistically significant differences (P>0.05). Large distances between landmarks are helpful in reducing system error, as demonstrated with a geometric method.


This study established an open-source algorithm to analyze the accuracy of guided implantation with system errors reported.

Klíčová slova:

Computed axial tomography – Computer software – Imaging techniques – Medical devices and equipment – Medical implants – Open source software – Surgical and invasive medical procedures – Teeth


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2019 Číslo 12
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