Van Waas M A, Jonkman R E, Kalk W, Van 't Hof M A, Plooij J, Van Os J H
Department of Oral Function and Prosthetic Dentistry, University of Nijmegen, The Netherlands.
J Dent Res. 1993 Jun;72(6):1001-4. doi: 10.1177/00220345930720060101.
In a randomized controlled clinical trial, 74 patients who required immediate dentures were randomly treated with immediate overdentures on two lower canines or with immediate complete dentures. Mandibular bone reduction was measured by use of oblique lateral cephalometric radiographs made at baseline and the results compared with those of one year and two years after denture treatment. Analysis of the data showed that the average bone reduction in the lower canine regions in the first year was 0.9 mm in the immediate-overdenture group and 1.8 mm in the immediate complete-denture group. In the posterior parts of the mandible, the bone reductions were, respectively, 0.7 mm and 1.9 mm. The differences were statistically significant in all measured regions. During the second year, no significant differences in bone reduction were found. The sums of differences in the first two years were significant in all regions except the molar region, preserving the initial difference. Retention of roots of canines beneath a mandibular denture in immediate denture patients, even when they were in poor condition, reduced the collapse of the alveolar processes in all regions of the mandible.
在一项随机对照临床试验中，74例需要即刻义齿的患者被随机分为两组，一组在两颗下颌尖牙上佩戴即刻覆盖义齿，另一组佩戴即刻全口义齿。通过在基线时拍摄下颌侧位头颅X线片测量下颌骨吸收情况，并将结果与义齿治疗后一年和两年的结果进行比较。数据分析表明，在第一年，即刻覆盖义齿组下颌尖牙区域的平均骨吸收为0.9mm，即刻全口义齿组为1.8mm。在下颌后部，骨吸收分别为0.7mm和1.9mm。在所有测量区域，差异均具有统计学意义。在第二年，未发现骨吸收有显著差异。除磨牙区外，前两年差异总和在所有区域均具有统计学意义，保持了最初的差异。在下颌即刻义齿患者中，即使尖牙牙根状况不佳，保留其在下颌义齿下方也能减少下颌所有区域牙槽突的塌陷。
