Halverson B A, Anderson W H
Oral Surgery Department, 2D Dental Company, 2D Dental Battalion, 2D FSSG FMFLANT, Camp Lejeune, NC 28542.
Mil Med. 1992 Mar;157(3):142-5.
During the 6-month period from mid February 1988 to mid August 1988, 148 patients presented with 154 diagnosed cases of mandibular third molar pericoronitis. All patients were members of the recruit population stationed at the Recruit Training Command, Great Lakes, Illinois. Selected clinical parameters relating to the orientation and eruption status of these third molars were collected and analyzed. The goal was to obtain a predictive clinical profile of the impacted mandibular third molar (MTM) at greatest risk for pericoronitis in the young naval and Marine Corps personnel. The majority of pericoronitis cases, 120 of 148 or 81.0%, involved vertically oriented MTMs; of this total, 79.1% were erupted to the approximate height of the occlusal plane of the arch. The remaining 20.9% were at or below the height of contour of the adjacent tooth. Mesioangular impacted MTMs accounted for only 11.2% of pericoronitis cases. The remaining cases comprised distoangular and horizontally impacted MTMs (3.4% and 3.8%, respectively). Involvement by impinging maxillary dentition was observed in 39.7% of the vertically oriented MTMs, 56.2% of the mesioangular oriented MTMs, 40.0% of the distoangular MTMs, and 14.0% of the horizontally impacted MTMs. The mean value for occlusal coverage by a soft tissue operculum observed for all MTMs in this study was 49%. In the population studied, risk for pericoronitis appears to increase with greater vertical orientation and height of eruption. The absence of impinging maxillary dentition did not eliminate the risk of mandibular third molar pericoronitis. These data have implications for targeting treatment needs of naval and Marine Corps personnel who may be without dental support for extended periods of time.
在1988年2月中旬至1988年8月中旬的6个月期间，148例患者被诊断为154例下颌第三磨牙冠周炎。所有患者均为驻扎在伊利诺伊州大湖新兵训练司令部的新兵。收集并分析了与这些第三磨牙的方向和萌出状态相关的选定临床参数。目的是获得年轻海军和海军陆战队人员中发生冠周炎风险最高的阻生下颌第三磨牙（MTM）的预测临床特征。大多数冠周炎病例（148例中的120例，占81.0%）涉及垂直方向的MTM；其中，79.1%萌出至牙弓咬合平面的大致高度。其余20.9%位于相邻牙齿外形高点或其下方。近中阻生MTM仅占冠周炎病例的11.2%。其余病例包括远中阻生和水平阻生MTM（分别为3.4%和3.8%）。在垂直方向的MTM中，39.7%观察到上颌牙列有干扰，近中方向的MTM中为56.2%，远中方向的MTM中为40.0%，水平阻生MTM中为14.0%。本研究中观察到的所有MTM软组织龈瓣覆盖咬合面的平均值为49%。在所研究的人群中，冠周炎的风险似乎随着垂直方向增加和萌出高度增加而增加。上颌牙列无干扰并不能消除下颌第三磨牙冠周炎的风险。这些数据对于确定可能长时间没有牙科支持的海军和海军陆战队人员的治疗需求具有重要意义。
