Patel D K, Burke F J
University Dental Hospital of Manchester.
Prim Dent Care. 1995 Mar;2(1):6-10.
To examine factors which may predispose to tooth fracture, and to assess the compressive strengths of foods and sweets which are associated with tooth fracture in vivo.
Consecutive dental patients presenting with one or more fractured posterior teeth at the surgeries of three general dental practitioners, over a four-month period.
A pro forma was designed to elicit information on the factors associated with tooth fracture and the nature and extent of such fractures. Three general dental practitioners were requested to complete a pro forma for each patient presenting with a fractured posterior tooth over a four-month period. Foods and sweets considered to be associated with tooth fracture were identified and their compressive strengths tested.
A total of 129 cases of fractured posterior teeth were recorded, of which 48% occurred in the mandibular arch and 52% in the maxillary arch. In the mandible, 75% of tooth fractures occurred in molars while in the maxillary arch 50% occurred in molars. In 57% of cases assessed, no identifiable causative item was noted. Forty-five per cent of fractures were in teeth which had been restored on three or more surfaces. Compressive forces of 0.16KN to 2.2KN were obtained for food items implicated in tooth fractures.
As mesio-occlusodistal restorations were identified as a major predisposing factor to tooth fracture in this study, with mandibular first molar teeth particularly affected, placement of cuspal coverage restorations may be considered to be a justifiable preventative measure in teeth identified as being at risk.
研究可能导致牙齿折断的因素，并评估与体内牙齿折断相关的食物和糖果的抗压强度。
在四个月的时间里，连续在三位普通牙科医生诊所就诊的出现一颗或多颗后牙折断的牙科患者。
设计了一份表格，以获取与牙齿折断相关的因素以及此类折断的性质和程度的信息。要求三位普通牙科医生为在四个月期间每一位出现后牙折断的患者填写一份表格。确定被认为与牙齿折断相关的食物和糖果，并测试它们的抗压强度。
共记录了129例后牙折断病例，其中48%发生在下颌牙弓，52%发生在上颌牙弓。在下颌，75%的牙齿折断发生在磨牙，而在上颌牙弓，50%发生在磨牙。在57%的评估病例中，未发现可识别的致病因素。45%的折断发生在三个或更多表面已修复的牙齿上。与牙齿折断相关的食物的抗压力量为0.16千牛至2.2千牛。
由于在本研究中近中-咬合-远中修复体被确定为牙齿折断的主要诱发因素，下颌第一磨牙尤其受影响，对于被确定有风险的牙齿，放置牙尖覆盖修复体可能被认为是一种合理的预防措施。
