Gillot Luc, Cannas Bernard, Friberg Bertil, Vrielinck Luc, Rohner Dennis, Pettersson Andreas
Part-time Lecturer, Faculty of Odontology, University Paris-Descartes, France.
Part-time Lecturer, Faculty of Odontology, University Paris-Descartes, France.
J Prosthet Dent. 2014 Oct;112(4):798-804. doi: 10.1016/j.prosdent.2014.05.008. Epub 2014 Jun 30.
The accuracy of mental navigation is thought to depend on the clinician's spatial ability. Mental navigation, therefore, is associated with deviations between the mental plan and the definitive implant position. To learn more about the deviation that might occur, it is important to evaluate the accuracy of mental navigation during placement of implants.
The purpose of the study was to compare accuracy outcomes between virtually planned and conventionally placed implants, and among surgeons with varying experience.
Five completely edentulous sets of maxillae and mandibles from human cadaver heads were scanned by computed tomography. Five surgeons planned and placed 60 implants into these jaws, and accuracy was analyzed for 4 parameters: coronal and apical positions, angulation, and depth. The preoperative and postoperative computed tomographies were aligned in voxel-based registration software, which allowed comparison between virtually planned implant positions and actual implant positions. Data were analyzed with the t test (α=.05), ANOVA, and the Scheffé test.
Mean (standard deviation) values were as follows: apex, 2.33 ±1.20 mm (range, 0.51-6.31 mm); coronal, 1.88 ±1.02 mm (range, 0.2-5.0 mm); angle, 7.34 ±3.62 degrees (range, 0.19-16.57 degrees); and depth, 0.03 ±1.15 mm (range, -3.47 to 2.10 mm). The apex and coronal position and the angle differed significantly between the virtually planned and actually placed implants. Significant between-surgeon differences were found in implant depth and coronal position. The apex and coronal positions differed significantly between the upper and lower jaw, with better performance achieved in the upper jaw.
The results found statistically significant differences between the virtually planned and conventionally placed implants and among the 5 surgeons.
心理导航的准确性被认为取决于临床医生的空间能力。因此，心理导航与心理计划和最终种植体位置之间的偏差相关。为了更多地了解可能出现的偏差，评估种植体植入过程中心理导航的准确性很重要。
本研究的目的是比较虚拟计划植入和传统植入的种植体之间的准确性结果，以及不同经验的外科医生之间的准确性结果。
对来自人类尸体头部的五组完全无牙的上颌骨和下颌骨进行计算机断层扫描。五位外科医生在这些颌骨中计划并植入了60颗种植体，并对四个参数的准确性进行了分析：冠部和根尖位置、角度和深度。术前和术后的计算机断层扫描在基于体素的配准软件中进行对齐，这允许比较虚拟计划的种植体位置和实际种植体位置。数据采用t检验（α = 0.05）、方差分析和谢费检验进行分析。
平均值（标准差）如下：根尖，2.33±1.20毫米（范围，0.51 - 6.31毫米）；冠部，1.88±1.02毫米（范围，0.2 - 5.0毫米）；角度，7.34±3.62度（范围，0.19 - 16.57度）；深度，0.03±1.15毫米（范围，-3.47至2.10毫米）。虚拟计划植入和实际植入的种植体之间，根尖和冠部位置以及角度存在显著差异。在种植体深度和冠部位置方面发现了外科医生之间的显著差异。上颌和下颌之间的根尖和冠部位置存在显著差异，上颌的表现更好。
结果发现虚拟计划植入和传统植入的种植体之间以及五位外科医生之间存在统计学上的显著差异。
