因牙周炎拔而除之臼齒齒頸部牙骨質釉質交接至齒根分叉部距離及牙釉質突起的探討

Evaluation of the Distance from the Cemento-enamel Junction to the Furcation and the Incidence of Enamel Projection of Molars Extracted Due to Periodontitis

陳洲林(Jou-Lin Chen) ； 林崧池(Song-Chyr Lin) ； 彭褔佑(Fu-Yio Peng) ； 張文魁(Wen-Kwei Chan)

《臺灣齒科醫學會雜誌》 11卷1期 (1988/05) Pp. 297-302

摘要

本研究是以省立桃園醫院牙科與台大醫院牙科牙周病部門，因慢性牙周炎被拔下的大臼齒為樣本，不包括第三大臼齒，共485顆。統計齒頸部牙釉質突起(cervical enamel projections)的發生率，並測量其牙骨質釉質交接(cementoenamel junction)到齒根分叉部(furcation area)的平均距離。得到以下的結果:(1)大臼齒牙釉質突起的出現率平均是62.47%。(2)各齒面牙釉質突起的發生率，以上顎第二大臼齒的頰面最高為78.43%；上顎第一大臼齒的遠心面最低只有1.88%。(3)上、下顎大臼齒各齒面牙釉質突起發生率，皆以頰面為最高。(4)上、下顎大臼齒牙釉質突起皆以第一級(Grade 1)出現最多。(5)大臼齒牙骨質釉質交接到齒根根分叉部的平均距離，以上額第二大臼齒的近心面最長，為4.50±1.33毫米１；而以下顎第一大臼齒的頰面2.58±0.85毫米為最短。(6)上、下顎大臼齒牙骨質釉質交接到齒根分叉部的平均距離，皆以頰面的平均距離最短。

並列摘要

Four hundren and eighty five Chinese permanent molar teeth were obtained, cleaned with 5% sodium hypochlorite and studied to determine the incidence and frequency of each classification of enamel projections, and the distance from the cemento-enamel junction to the furcation area on each surface. The incidence of enamel projection is 62.47%: 173 were Grade I; 129 were Grade II; 126 were Grade III. Statistical analyses (Chi-square test) revealed no significant difference between the incidence of enamel projection of upper molars (64. 12%) and lower molars (60.54%). The distance of cemento-enamel junction to the bottom of furcation ranged from 0.25mm to 10.75mm, with the longest in the mesial surface of upper second molar (4.50 ± 1.33mm) and the shortest in the buccal surface of lower first molar (2.58 ±0.85 mm).

並列關鍵字

furcation ； cementoenamel junction ； enamel projection