三次元歯列記録のための新しいバーチャル咬合器の精度

Accuracy of a Novel Virtual Articulator for Recording Three-Dimensional Dentition.

抄録

目的:

コンピュータ両眼視、ラスタースキャン、シミュレーション技術を応用した新しいバーチャル咬合器システム（PN-300）を研究開発し、その精度を予備的に評価する。

PURPOSE: To research and develop a novel virtual articulator system (the PN-300) based on computer binocular vision, raster scanning, and simulation technology and to conduct a preliminary evaluation of its accuracy.

材料と方法:

仮想咬合器システムの軌跡追跡部には2台のデジタルカメラを使用し、走査部には投影モジュールと組み合わせたカメラを使用した。PN-300の最大の特徴は、被験者の歯の3Dデータと上顎に対する下顎の移動軌跡を同時に取得できることである。PN-300は、高精度3D電子平行移動ステージの直線、円、四角形の動きを記録した。また、PROTAR evo7咬合器に基づき、PN-300から得られる切歯誘導の傾斜の測定精度を評価しました。

MATERIALS AND METHODS: Two digital cameras were used to build the trajectory-tracking part of the virtual articulator system, and cameras combined with a projection module were used to form the scanning part of the system. The most prominent feature of the PN-300 is its ability to simultaneously obtain the 3D data of the subject's teeth and the movement trajectory of the mandible relative to the maxilla. The PN-300 recorded the linear, circular, and rectangular quadrilateral movements of a high-accuracy 3D electronic translation stage. The accuracy of measurement of the inclination of incisal guidance derived from the PN-300 based on the PROTAR evo7 articulator was also estimated.

結果:

測定誤差は直線運動と円運動で100μm以下、四角形運動では角度誤差は0.2度以内であった。切歯突起誘導の傾斜誤差は1.51±0.68度、切歯誘導の傾斜誤差は0.82±0.55度であった。PN-300で得られた軌跡と切歯の3Dデータを石膏模型とCBCTのデータと組み合わせて下顎運動をシミュレーションし、顆頭の軌跡を算出した。

RESULTS: The measurement error was below 100 μm for the linear and circular movements, and the angle error was within 0.2 degrees for the rectangular quadrilateral movements. The error of inclination of protrusive incisal guidance was 1.51 ± 0.68 degrees, and for incisal guidance was 0.82 ± 0.55 degrees. Trajectories and incisal 3D data obtained by the PN-300 were combined with data from plaster models and CBCT to simulate mandibular movement and to calculate the trajectories of the condyle.

結論:

PN-300は下顎運動の記録精度が高く、顆頭運動の算出が期待できる。

CONCLUSION: The PN-300 achieved a good accuracy for recording mandibular movement and can be expected to calculate the movement of the condyle.