Sun Stella Yue, Yeo Woon Chee, Tay Andrew Ban Guan, Tan Donald Tiang Hwee, Tan Danny Ben Poon
Department of Restorative Dentistry, National Dental Centre Singapore, Singapore.
Department of Orthodontics, National Dental Centre Singapore, Singapore.
Asia Pac J Ophthalmol (Phila). 2018 Mar-Apr;7(2):76-83. doi: 10.22608/APO.2017515. Epub 2018 Mar 6.
Osteoodontokeratoprosthesis (OOKP) surgery is used to restore vision in end-stage corneal disorders, where an autogenous tooth supporting an optical cylinder is implanted through the cornea under a buccal mucosal graft. The ideal tooth for OOKP is a healthy single-rooted permanent tooth with sufficient buccolingual/palatal root diameter to accommodate an optical cylinder. The aim of this study was to determine the buccolingual/palatal diameters of canine and premolar roots in Chinese, for selection of teeth for OOKP surgery.
This was an anatomical study on root dimensions of extracted intact teeth.
Extracted canine and premolar teeth (excluding maxillary first premolars) were collected and the buccolingual/palatal and mesiodistal diameters of the root at the cervical line and at 2-mm intervals below the cervical line were measured with Vernier calipers. Other measurements included total tooth length, crown buccolingual/palatal diameter, and root length. Mean and minimum buccolingual/palatal root diameters were compiled for each 2-mm interval.
A total of 415 extracted teeth (198 male, 217 female) were collected and measured. Recorded dimensions of keratoprostheses in 55 previous OOKP surgeries were used to establish acceptable lamina dimensions to ascertain root size adequacy. Premolars in Chinese female patients were undersized in a small minority. Minimal dimensions of teeth were insufficient if at 6 mm root level, the buccolingual/palatal width was less than 5 mm, or the mesiodistal width was less than 3 mm. This was noted in female mandibular first premolars (5.6%), maxillary second premolars (4.5%), and mandibular second premolars (1.5%).
Canines have adequate dimensions for OOKP surgery. However, premolars in Chinese females may be undersized in a small minority.
骨牙角膜移植术（OOKP）用于恢复终末期角膜疾病患者的视力，手术是将一颗支撑光学柱镜的自体牙经角膜植入，并覆盖颊黏膜移植物。OOKP理想的牙齿是健康的单根恒牙，其颊舌/腭根直径足以容纳光学柱镜。本研究旨在测定中国人犬齿和前磨牙牙根的颊舌/腭直径，为OOKP手术选择合适的牙齿。
这是一项对拔除的完整牙齿牙根尺寸的解剖学研究。
收集拔除的犬齿和前磨牙（不包括上颌第一前磨牙），用游标卡尺测量牙根在颈缘处以及颈缘以下2毫米间隔处的颊舌/腭直径和近远中直径。其他测量包括牙齿总长度、牙冠颊舌/腭直径和牙根长度。每2毫米间隔记录平均和最小颊舌/腭牙根直径。
共收集并测量了415颗拔除的牙齿（男性198颗；女性217颗）。利用之前55例OOKP手术中记录的角膜移植片尺寸，确定可接受的板层尺寸，以确定牙根大小是否合适。中国女性患者中的少数前磨牙尺寸过小。如果牙根在6毫米水平处，颊舌/腭宽度小于5毫米，或近远中宽度小于3毫米，则牙齿最小尺寸不足。女性下颌第一前磨牙（5.6%）、上颌第二前磨牙（4.5%）和下颌第二前磨牙（1.5%）出现这种情况。
犬齿尺寸适合OOKP手术。然而，少数中国女性的前磨牙可能尺寸过小。
