Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI 48109-1078, USA.
J Periodontol. 2010 Feb;81(2):239-43. doi: 10.1902/jop.2009.090417.
The aims of this study are to determine the distance of the external surface of the buccal cortical plate to the inferior alveolar canal in the mandibular molar region and to propose a safe thickness for harvesting a mandibular ramus block graft.
Thirty-four cadavers consisting of 26 dentate jaws and eight jaws in the edentulous molar region were used in this study. All mandibular ramus grafts were harvested by one investigator with the grafts extending from the external oblique ridge (EOR) and 15 mm inferiorly in the apico-coronal direction and extending from the mid-buccal aspect of the first molar to the mid-buccal aspect of the third molar in the mesio-distal direction. Measurements were made of the cortical bone thickness of the harvested ramus graft and from the cemento-enamel junction (CEJ) to the EOR, the CEJ to the mandibular border, and the CEJ to the inferior alveolar nerve (IAN).
The average buccal cortical plate thickness in dentate mandibles was 2.76 +/- 0.13 mm, whereas in edentulous posterior mandibles it was 2.52 +/- 0.32 mm. The IANs were exposed in all jaws but were intact.
The safe thickness to harvest ramus grafts was determined to be 2.5 to 3.0 mm.
本研究旨在确定下颌磨牙区颊侧皮质板外表面到下牙槽神经管的距离，并提出一种安全的下颌支块移植骨采集厚度。
本研究共使用 34 具尸体标本，其中 26 具为有牙颌，8 具为无牙颌磨牙区。所有下颌支移植骨均由一名研究人员采集，移植骨从外斜嵴（EOR）向下延伸 15mm，在根尖-冠向延伸，从第一磨牙的颊侧中部到第三磨牙的颊侧中部，在近-远向延伸。测量采集的下颌支移植骨的皮质骨厚度，以及从牙釉质-牙骨质界（CEJ）到 EOR、CEJ 到下颌缘、CEJ 到下牙槽神经（IAN）的距离。
有牙下颌骨的颊侧皮质板平均厚度为 2.76±0.13mm，而无牙下颌骨后牙区的颊侧皮质板厚度为 2.52±0.32mm。所有颌骨均暴露 IAN，但均保持完整。
确定安全的下颌支移植骨采集厚度为 2.5 至 3.0mm。
