Abstract：
The study represents a preliminary evaluation of the accuracy of the dynamic navigation system (DNS) in coronectomy of the mandibular third molar (M3M).
The study included participants with an impacted M3M near the inferior alveolar canal. The coronectomy planes were designed before the surgery using cone-beam computed tomography (CBCT) imaging data and then loaded into the DNS program. Intraoperatively, the navigation system was used to guide the complete removal of the target crown. Postoperative CBCT imaging was used to assess any three-dimensional deviations of the actual postoperative from the planned preoperative section planes for each patient.
A total of 12 patients (13 teeth) were included. The root mean square (RMS) deviation of the preoperatively designed plane from the actual postoperative surface was 0.69 ± 0.21 mm, with a maximum of 1.45 ± 0.83/-1.87 ± 0.63 mm deviation. The areas with distance deviations < 1 mm, 1-2 mm, and 2-3 mm were 71.97 ± 5.72 %, 22.96 ± 6.57 %, and 4.52 ± 2.28 %, respectively. Most patients showed extremely high convexity of the surface area located in the mesial region adjacent to the base of the extraction socket. There was no observable evidence of scratching of the buccolingual bone plate at the base of the extraction socket by the handpiece drill.
These results provide preliminary support for the use of DNS-based techniques when extracting M3M using a buccal approach. This would improve the accuracy of coronectomy and reduce the potiential damage to the surrounding tissue.
DNS is effective for guiding coronectomy.
The study included participants with an impacted M3M near the inferior alveolar canal. The coronectomy planes were designed before the surgery using cone-beam computed tomography (CBCT) imaging data and then loaded into the DNS program. Intraoperatively, the navigation system was used to guide the complete removal of the target crown. Postoperative CBCT imaging was used to assess any three-dimensional deviations of the actual postoperative from the planned preoperative section planes for each patient.
A total of 12 patients (13 teeth) were included. The root mean square (RMS) deviation of the preoperatively designed plane from the actual postoperative surface was 0.69 ± 0.21 mm, with a maximum of 1.45 ± 0.83/-1.87 ± 0.63 mm deviation. The areas with distance deviations < 1 mm, 1-2 mm, and 2-3 mm were 71.97 ± 5.72 %, 22.96 ± 6.57 %, and 4.52 ± 2.28 %, respectively. Most patients showed extremely high convexity of the surface area located in the mesial region adjacent to the base of the extraction socket. There was no observable evidence of scratching of the buccolingual bone plate at the base of the extraction socket by the handpiece drill.
These results provide preliminary support for the use of DNS-based techniques when extracting M3M using a buccal approach. This would improve the accuracy of coronectomy and reduce the potiential damage to the surrounding tissue.
DNS is effective for guiding coronectomy.
摘要：
目的：该研究代表了对下颌第三磨牙（M3M）冠切除术中动态导航系统（DNS）准确性的初步评估。
方法：该研究包括下牙槽管附近M3M受累的参与者。手术前使用锥形束计算机断层扫描（CBCT）成像数据设计冠状动脉切除术平面，然后将其加载到DNS程序中。术中,导航系统用于指导目标冠的完全去除。术后CBCT成像用于评估每位患者实际术后与计划的术前切面的任何三维偏差。
结果：共纳入12例患者（13颗牙齿）。术前设计平面与术后实际表面的均方根(RMS)偏差为0.69±0.21mm,最大偏差为1.45±0.83/-1.87±0.63mm。距离偏差<1mm的区域,1-2mm,2-3毫米为71.97±5.72%，22.96±6.57%,4.52±2.28%，分别。大多数患者在靠近拔牙槽底部的内侧区域显示出非常高的表面凸度。没有可观察到的证据表明，机头钻刮伤了拔牙窝底部的颊舌骨板，导致凹痕。
结论：这些结果为使用口腔方法提取M3M时使用基于DNS的技术提供了初步支持。这将提高冠状动脉切除术的准确性并减少对周围组织的潜在损害。
结论：DNS对指导冠状动脉切除术有效。
方法：该研究包括下牙槽管附近M3M受累的参与者。手术前使用锥形束计算机断层扫描（CBCT）成像数据设计冠状动脉切除术平面，然后将其加载到DNS程序中。术中,导航系统用于指导目标冠的完全去除。术后CBCT成像用于评估每位患者实际术后与计划的术前切面的任何三维偏差。
结果：共纳入12例患者（13颗牙齿）。术前设计平面与术后实际表面的均方根(RMS)偏差为0.69±0.21mm,最大偏差为1.45±0.83/-1.87±0.63mm。距离偏差<1mm的区域,1-2mm,2-3毫米为71.97±5.72%，22.96±6.57%,4.52±2.28%，分别。大多数患者在靠近拔牙槽底部的内侧区域显示出非常高的表面凸度。没有可观察到的证据表明，机头钻刮伤了拔牙窝底部的颊舌骨板，导致凹痕。
结论：这些结果为使用口腔方法提取M3M时使用基于DNS的技术提供了初步支持。这将提高冠状动脉切除术的准确性并减少对周围组织的潜在损害。
结论：DNS对指导冠状动脉切除术有效。
