Accuracy and Reproducibility of a Manual 3-Dimensional Superimposition Method to Register Dental Model Images to Cone-Beam Computer Tomography (CBCT) Image-A Preliminary Study

以徒手3D疊合技術將牙模影像對位於錐形線束電腦斷層頭顱影像之精確性與重覆性－初步研究

廖宥舒(Yu-Shu Liao) ； 許勝評(Sam Sheng-Pin Hsu) ； 林佩儒(Pei-Ju Lin) ； 王建琁(Chien-Hsuan Wang) ； 林秀霞(Hsiu-Hsia Lin) ； Dhruv Singhal ； 林政輝(Cheng-Hui Lin) ； 黃炯興(Chiung-Shing Huang) ； 羅綸州(Lun-Jou Lo) ； 柯雯青(Ellen Wen-Ching Ko) ； 陳昱瑞(Yu-Ray Chen)

《中華民國齒顎矯正學雜誌》 24卷4期 (2012/12) Pp. 16-23

https://doi.org/10.30036/TJO.201212.0002

摘要

目的：此實驗的目的是要評估以徒手3D疊合技術將牙模影像對位於錐形線束電腦斷層頭顱影像之精確性與重覆性。材料和方法：此研究包含八個病患中的十二個牙弓。錐形線束電腦斷層頭顱影像與牙科印模依矯正紀錄取得，牙模影像經雷射掃描後以STL檔案模式儲存。在SimPlant OMS軟體中以徒手3D疊合技術將牙模影像對位於錐形線束電腦斷層頭顱影像，之後在3dMDvultus中做驗證，其精確性以RMSD來呈現，之後再以Wilcoxon Two-Sample Test and pair T test來評估不同受試者及相同受試者間的不同。結果：受試者A和B的RMSD分別為0.31和0 .23，兩者間在統計學上有顯著差異。受試者A前後兩次的RMSD都是0 . 31，在統計學上無顯著差異。結論：整體來看，徒手3D疊合技術在對位上可得到良好的精確性，但仍可能有太大的誤差會影響臨床上的結果，因此強烈建議以徒手3D疊合技術時須將對位結果再做驗證。

關鍵字

對位 ； 影像疊合 ； 錐形線束電腦斷層頭顱影像 ； 精確性 ； 重複性 ； 3D ； 牙齒模型

並列摘要

Purpose: The purposes of this study was to evaluate the registration error and its reproducibility for implementation of the laser-scanned dental model images onto the CBCT scan data by using the manual 3D superimposition.Materials and methods: Twelve arches out of 8 consecutive patients were enrolled in this study. Both CBCT and dental impression were taken as orthodontic records and the dental casts were then laser-scanned into dental model images with STL file format. In SimPlant OMS software, we register the dental model images onto CBCT teeth images with manual 3D superimposition technique. Afterwards, validation was performed in 3dMDvultus and the accuracy was presented in terms of root mean square difference (RMSD). Wilcoxon Two-Sample Test and pair T test was used for post-hoc comparisons to evaluated the intra-operator and inter-operator difference.Results: The RMSD of shell/shell deviation was 0.31 mm in operator A and 0.23 mm in operator B. There was significant difference between these two. The RMSD of shell/shell deviation in operator A was both 0.31 mm in 1st and 2nd time operations. There was no significant difference between these two operations.Conclusions: Free-hand 3D superimposition is able to achieve good accuracy of registration. However, outlier still exists and would deteriorate clinical results. So validation of the registration is highly recommended after each registration with the use of this manual 3D superimposition technique.

並列關鍵字

Registration ； Superimposition ； CBCT ； Accuracy ； Reproducibility ； 3D ； dental model