Universidade Federal dos Vales do Jequitinhonha e Mucuri, Rua da Glória, 187, Centro, Diamantina, Minas Gerais, 39100-000, Brazil.
Arch Oral Biol. 2019 Nov;107:104486. doi: 10.1016/j.archoralbio.2019.104486. Epub 2019 Jul 25.
The aim of this study was to investigate the association between mandibular third molar position and occurrence of pericoronitis.
The systematic review was performed based on PRISMA criteria (Prospero: CRD42018102835). The electronic search was performed in Medline, Virtual Health Library and Web of Science (until August 2018), without language restriction. Two researchers independently selected studies, extracted data, and assessed methodologic quality. Twenty-one articles were included in the review, comprising 6895 patients, with 1913 third mandibular molars being affected by pericoronitis. Ten studies were incuded in meta-analysis.
The third molar in vertical position of Winter is the one with the greatest chance of presenting pericoronitis, compared to the other positions, while the horizontal position decreases this chance. There was no significant difference in the chance of pericoronitis between positions I and II of Pell & Gregory (OR: 0.29; IC: 0.07-1.23, I = 88%). Third molars classified in position A had greater chance of pericoronitis when compared to those in position B (OR: 7.13; IC: 1.31-38.74, I = 93%). The vertical position of the lower third molar is more associated with the occurrence of pericoronitis when compared to the other positions.
Vertical position of the lower third molar is more associated with the occurrence of pericoronitis when compared to the other Winter' positions. Considering Pell and Gregory positions, position A had a greater chance of pericoronitis compared to position B. The prophylactic removal of lower third semi-erupted vertical molar or in position A is indicated to prevent pericoronitis.
本研究旨在探讨下颌第三磨牙位置与冠周炎发生的关系。
系统评价按照 PRISMA 标准（Prospero：CRD42018102835）进行。电子检索包括 Medline、Virtual Health Library 和 Web of Science（截至 2018 年 8 月），无语言限制。两名研究人员独立选择研究、提取数据并评估方法学质量。共纳入 21 篇文献，包含 6895 例患者，其中 1913 颗下颌第三磨牙发生冠周炎。10 项研究纳入荟萃分析。
Winter 分类法中垂直位的第三磨牙比其他位置更容易发生冠周炎，而水平位则降低了这种可能性。Pell 和 Gregory 分类法中 I 位和 II 位的第三磨牙发生冠周炎的几率无显著差异（OR：0.29；95%CI：0.07-1.23，I²=88%）。与 B 位相比，A 位的第三磨牙发生冠周炎的几率更高（OR：7.13；95%CI：1.31-38.74，I²=93%）。与其他位置相比，下颌第三磨牙的垂直位置与冠周炎的发生更为相关。
与其他 Winter 位置相比，下颌第三磨牙的垂直位置与冠周炎的发生更为相关。与 Pell 和 Gregory 位置相比，A 位的第三磨牙发生冠周炎的几率更高。建议预防性拔除下颌未完全萌出的垂直位或 A 位第三磨牙，以预防冠周炎。
