Measuring zygomaticomaxillary complex symmetry three-dimensionally with the use of mirroring and surface based matching techniques

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• 作者：Jean-Pierre T.F. Ho^a ; ^{j.p.ho@amc.uva.nl" class="auth_mail" title="E-mail the corresponding author} ; Ruud Schreurs^b ; ^{r.schreurs@amc.uva.nl" class="auth_mail" title="E-mail the corresponding author} ; Dan M.J. Milstein^a ; ^{d.m.milstein@amc.uva.nl" class="auth_mail" title="E-mail the corresponding author} ; Leander Dubois^a ; ^{l.dubois@amc.uva.nl" class="auth_mail" title="E-mail the corresponding author} ; Thomas J.J. Maal^b ; ^{Thomas.Maal@radboudumc.nl" class="auth_mail" title="E-mail the corresponding author} ; Jan de Lange^a ; ^{j.delange@amc.uva.nl" class="auth_mail" title="E-mail the corresponding author} ; Alfred G. Becking^a ; ^{ag.becking@amc.uva.nl" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Symmetry ; Zygomaticomaxillary complex ; Computer-assisted surgery ; Surface-based matching ; Iterative closest point
• 刊名：Journal of Cranio-Maxillofacial Surgery
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：44
• 期：10
• 页码：1706-1712
• 全文大小：1196 K

文摘

The study aim was to validate a new method for measuring zygomaticomaxillary complex (ZMC) symmetry, which can be helpful in analyzing ZMC fractures.

d="absSec_2">Methods

d="abspara0015">Three-dimensional virtual hard-tissue models were reconstructed from computed tomography (CT) datasets of 26 healthy individuals. Models were mirrored and superimposed. Absolute average distance (AD) and 90th percentile distance (NPD) were used to measure overall and maximal symmetry. The Intraclass Correlation Coefficient (ICC) was calculated to measure interobserver consistency. In order to determine whether this technique is applicable in ZMC fracture cases, 10 CT datasets of individuals with a unilateral ZMC fracture were analyzed.

d="absSec_3">Results

d="abspara0020">For the unaffected group the mean AD was 0.84 ± 0.29 mm (95% CI 0.72–0.96) and the mean NPD was 1.58 ± 0.43 mm (95% CI 1.41–1.76). The ICC was 0.97 (0.94–0.98 as 95% CI), indicating almost perfect interobserver agreement. In the affected group the mean AD was 2.97 ± 1.76 mm (95% CI 1.71–4.23) and the mean NPD was 6.12 ± 3.42 mm (95% CI 3.67–8.57). The affected group showed near-perfect interobserver agreement with an ICC of 0.996 (0.983–0.999 as 95% CI).

d="absSec_4">Conclusions

d="abspara0025">The method presented is an accurate instrument for evaluation of ZMC symmetry, which can be helpful for advanced diagnostics and treatment evaluation.