Graduate Periodontics, School of Dentistry, University of Michigan, Ann Arbor, MI 48109–1078, USA.
J Periodontol. 2011 Jan;82(1):129-35. doi: 10.1902/jop.2010.100313. Epub 2010 Jul 27.
Lingual plate perforation at the time of implant placement in posterior mandible is a potential surgical complication, and presence of a lingual concavity is considered a risk factor. Little is known about the spatial relationship between implant and lingual plate. The role of lingual concavity in the risk of lingual perforation has not yet been fully studied. This computer-simulated study investigates the incidence of lingual plate perforation in edentulous mandibular first molar region and the risk of perforation in the area of lingual concavity.
One hundred and three qualified cone-beam computed tomography scans were selected from the database. Implants of various dimensions were virtually placed into the area using computer software. The distance between implant tip and lingual plate was measured using a digital caliper. Incidence of lingual plate perforation and proximity of the implant tip to lingual plate were measured for three types of cross-sectional mandibular morphology.
One hundred and three cone-beam computed tomography scans with 118 sites were available for analysis. The intraexaminer and interexaminer agreements were 0.93 and 0.89, respectively. The predicted incidence of lingual plate perforation was 1.1% to 1.2%. Most implants, which were within 1 mm from lingual plate, occurred in sites with lingual concavity (type-U ridge).
This study demonstrates a novel experimental design by which the spatial relation between implant and lingual plate in mandibular first molar region is investigated. Incidence of lingual plate perforation during implant placement is predicted to be 1.1% to 1.2% and it will most likely happen in type-U ridge.
在下颌后牙区植入种植体时发生舌板穿孔是一种潜在的手术并发症，而存在舌侧凹陷被认为是一个危险因素。人们对种植体与舌板之间的空间关系知之甚少。舌侧凹陷在舌侧穿孔风险中的作用尚未得到充分研究。本计算机模拟研究调查了无牙下颌第一磨牙区舌板穿孔的发生率和舌侧凹陷区域穿孔的风险。
从数据库中选择了 103 份合格的锥形束 CT 扫描。使用计算机软件将各种尺寸的种植体虚拟植入该区域。使用数字卡尺测量种植体尖端和舌板之间的距离。测量了三种类型的下颌横截面形态的舌板穿孔发生率和种植体尖端与舌板的接近程度。
有 103 份锥形束 CT 扫描，共 118 个部位可用于分析。内检者和间检者的一致性分别为 0.93 和 0.89。预测舌板穿孔的发生率为 1.1%至 1.2%。大多数离舌板 1 毫米以内的种植体发生在有舌侧凹陷（U 型嵴）的部位。
本研究通过一种新的实验设计，研究了下颌第一磨牙区种植体与舌板之间的空间关系。预测种植体植入时舌板穿孔的发生率为 1.1%至 1.2%，最有可能发生在 U 型嵴。
