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首页> 外文期刊>Maxillofacial Plastic and Reconstructive Surgery >Spontaneous bone regeneration after surgical extraction of a horizontally impacted mandibular third molar: a retrospective panoramic radiograph analysis
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Spontaneous bone regeneration after surgical extraction of a horizontally impacted mandibular third molar: a retrospective panoramic radiograph analysis

机译：手术摘除水平撞击的下颌第三磨牙后的自发性骨再生：回顾性全景X射线照片分析

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Abstract BackgroundThe mandibular third molar (M3) is typically the last permanent tooth to erupt because of insufficient space and thick soft tissues covering its surface. Problems such as alveolar bone loss, development of a periodontal pocket, exposure of cementum, gingival recession, and dental caries can be found in the adjacent second molars (M2) following M3 extraction. The specific aims of the study were to assess the amount and rate of bone regeneration on the distal surface of M2 and to evaluate the aspects of bone regeneration in terms of varying degree of impaction.MethodsFour series of panoramic radiographic images were obtained from the selected cases, including images from the first visit, immediately after extraction, 6?weeks, and 6?months after extraction. ImageJ software? (NIH, USA) was used to measure linear distance from the region of interest to the distal root of the adjacent M2. Radiographic infrabony defect (RID) values were calculated from the measured radiographic bone height and cementoenamel junction with distortion compensation. Repeated measures of analysis of variance and one-way analysis of variance were conducted to analyze the statistical significant difference between RID and time, and a Spearman correlation test was conducted to assess the relationship between Pederson’s difficulty index (DI) and RID.ResultsA large RID (?6?mm) can be reduced gradually and consistently over time. More than half of the samples recovered nearly to their normal healthy condition (RID ≤?3?mm) by the 6-month follow-up. DI affected the first 6?weeks of post-extraction period and only showed a significant positive correlation with respect to the difference between baseline and final RID.ConclusionsAdditional treatments on M2 for a minimum of 6?months after an M3 extraction could be recommended. Although DI may affect bone regeneration during the early healing period, further study is required to elucidate any possible factors associated with the healing process. The DI does not cause any long-term adverse effects on bone regeneration after surgical extraction.
机译：摘要背景下颌第三磨牙（M3）通常是由于空间不足和覆盖其表面的厚厚软组织而最终爆发的恒牙。 M3拔牙后，在相邻的第二磨牙（M2）中会发现诸如牙槽骨丢失，牙周袋发展，牙骨质暴露，牙龈退缩和龋齿等问题。该研究的具体目的是评估M2远端表面的骨再生的数量和速率，并评估不同程度的撞击的骨再生方面。方法从所选病例中获得四组全景X射线摄影图像，包括首次访问，提取后，提取后6周和6个月中的图像。 ImageJ软件？ （NIH，美国）用于测量从感兴趣区域到相邻M2的远端根的线性距离。根据测量的放射线骨高和畸变补偿的牙釉质接合处，计算放射线下骨缺损（RID）值。重复测量方差分析和单向方差分析以分析RID与时间之间的统计显着性差异，并进行Spearman相关检验以评估Pederson难度指数（DI）与RID之间的关系。 （>？6？mm）可以随着时间的推移逐渐减小并保持一致。在六个月的随访中，超过一半的样本恢复到了正常健康状态（RID≤？3？mm）。 DI影响提取后的前6周，并且仅显示出基线和最终RID之间的显着正相关。结论M3提取后建议对M2进行至少6个月的额外治疗。尽管DI可能会在早期愈合阶段影响骨骼的再生，但仍需要进一步研究以阐明与愈合过程相关的任何可能因素。 DI不会对手术拔除后的骨再生造成任何长期的不利影响。

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