摘要
牙根面凹陷(root concavity)的存在,一方面使牙周病 的患齒容易積存牙菌斑(dental plaque) ,另一方面病人不易保持清潔的口腔衛生增加治療上的困難,使牙周疾病的治療容易失敗。牙根凹陷發生在各牙齒的情形,文獻雖曾被提及,但卻缺乏詳細的統計資料,而且以牙冠形態區別牙齒位置常有誤差。又 國內有關牙根凹陷之文獻尚村闕如。本研究乃選取有明確位置記錄之牙齒,對其牙根面凹陷出現之情形,加以統計與分析。結果簡單摘要如下: 1.上、下顎牙齒均以第一大臼齒發生牙根面凹陷之比例最高,中切齒最低。2.上顎牙齒中除了前齒外,其餘牙曲 的牙根面凹陷的發生率均較下顎相對位置的牙齒為高。3.除了下顎小臼齒外;牙齒的位置愈接近後牙,凹陷的發生率愈高,至第 一大臼齒達最高峰而後略降。4.根面凹陷位置的分怖,除了上顎臼齒(月咢)根外,均集中於都接面,且遠心面及面向根面叉部的根面有較高的發生率。5.大部份的牙齒其牙根面凹陷的範團均涵蓋了齒頸部及中央三分之一的牙根。由本研究之結果及根面凹陷存在 之意義,有助於國人牙周病治療計劃之擬定與治療上之參考。
關鍵字
無資料並列摘要
Dental plaque is more easily accumulated on concavity of tooth root involved in periodontal disease. Root concavity enhences the difficulty of the treatment and cleaning leading to the failure of periodontal therapy. Although the clinical significance of root discussed, it lacks of the comprehensive discussed, it lacks of the comprehensive and detailed analytical information. In addition, there are still lack of related literatures in Chinese. According to the known position of each tooth, the root concavities of 1026 teeth were recorded and analyzed in this study. The conclusions are as follow: I . The highest prevalence of root concavity is first molars and the lowest is central incisors for both upper and lower Jaws. 2. The prevalence of root concavity in maxilla, excepted in anterior region, is higher than that of corresponding positional tooth in mandible. 3. With the exception of mandibular premolars, the more proximal towards the posterior tooth, the higher the prevalence of root concavity is, until it reaches the first molar and then progressively declined. 4. The distribution of root concavity were frequently found on the distal and furcation surfaces. 5. The areas of root concavity in most of teeth will cover the cervical third and middle third of the root. The results of this study, and the significance of foot concavity might help the treatment planing of periodontal therapy.