下颌第三磨牙拔除后骨形成和密度变化的影像学评估：6个月随访
Radiographic Evaluation of Bone Formation and Density Changes after Mandibular Third Molar Extraction: A 6 Month Follow up.
作者信息
Haghighat Abbas, Hekmatian Ehsan, Abdinian Mehrdad, Sadeghkhani Ezzeddin
机构信息
Assistant Professor, Department of Oral and Maxillofacial Sergury and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
出版信息
Dent Res J (Isfahan). 2011 Winter;8(1):1-5.
BACKGROUND
There is a controversy about exact time of bone healing. The aim of this study was evaluation of bone formation and change of density after mandibular third molar extraction.
METHODS
Radiographs were taken from 16 empty tooth sockets immediately after extraction of mandibular third molars and 2, 4 and 6 months later under similar condition. The radiographs were digitized and the density numbers of pixels were calculated. Then, socket and neighbor regions were compared using Photoshop software. Three expert observers evaluated and compared the radiographs by the longitudinal radiographic assessment (LRA) method. Paired t-test and McNemar test were used to analyze the data and investigate the inter-observer reliability, respectively.
RESULTS
Analysis of the quantitative digital subtraction radiography (QDSR) data indicated that the difference between the digital numbers of interest points and reference points has been decreased during the months 2, 4 and 6 but the difference between the month 4 and 6 was not significant. The alternative method indicated that the mean digital numbers in the socket within 0and 2 months period was less than 128 and within 4 and 6 months was more than 128. In evaluation of LRA method, lamina dura started to change gradually in month 2 and it might disappear completely after 6 months.
CONCLUSION
Both QDSR and LRA methods can be used in evaluation of the rate of bone formation in the tooth socket but the former is more precise.
背景
关于骨愈合的确切时间存在争议。本研究的目的是评估下颌第三磨牙拔除后骨形成及密度变化。
方法
在下颌第三磨牙拔除后即刻以及2、4和6个月后，在相似条件下对16个空牙槽拍摄X线片。将X线片数字化并计算像素的密度值。然后，使用Photoshop软件比较牙槽及邻接区域。三位专家观察者采用纵向X线评估（LRA）方法对X线片进行评估和比较。分别使用配对t检验和McNemar检验分析数据并研究观察者间的可靠性。
结果
定量数字减影X线摄影（QDSR）数据分析表明，在2、4和6个月期间，兴趣点与参考点的数字差异有所减小，但4个月和6个月之间的差异不显著。另一种方法表明，牙槽内0至2个月期间的平均数字小于128，4至6个月期间大于128。在LRA方法评估中，骨硬板在第2个月开始逐渐变化，6个月后可能完全消失。
结论
QDSR和LRA方法均可用于评估牙槽骨形成速率，但前者更精确。
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