Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, Box 0758, San Francisco, CA 94143-0758, USA.
J Dent. 2010 Jul;38(7):597-601. doi: 10.1016/j.jdent.2010.03.010. Epub 2010 Mar 30.
Recent literature suggests that the scalloped structure of the dentino-enamel junction (DEJ) is critical for DEJ stability. Aim of our study was to see if there are differences in scallop size and shape with tooth type.
Enamel of extracted permanent human teeth was demineralised using EDTA. After fixation and dehydration the scallops of the DEJ were investigated in a scanning electron microscope. Scallop area and shape (circularity) were measured for molars, premolars, canines and incisors.
Scallop area showed main effects for tooth type and specimen, while, due to high variability in third molars, there was also an interaction effect (repeated measures two-way ANOVA, p<0.05). Differences between tooth types were statistically significant, suggesting that posterior teeth showed larger scallops compared to anterior teeth. Differences in shape (circularity) were not statistically significant.
Our results suggest that teeth which are subject to higher masticatory loads (posterior teeth) show larger and more pronounced scallops. These findings might be of interest for improving other interfaces joining dissimilar materials.
最近的文献表明,牙本质-釉质交界(DEJ)的扇贝形结构对于 DEJ 的稳定性至关重要。本研究旨在观察不同类型的牙齿之间是否存在扇贝大小和形状的差异。
使用 EDTA 对提取的人恒牙的牙釉质进行脱矿处理。固定和脱水后,使用扫描电子显微镜观察 DEJ 的扇贝。测量磨牙、前磨牙、尖牙和切牙的扇贝面积和形状(圆度)。
扇贝面积显示出牙齿类型和标本的主要影响,而由于第三磨牙的变异性很高,因此也存在交互效应(重复测量双向方差分析,p<0.05)。牙齿类型之间的差异具有统计学意义,表明后牙的扇贝比前牙更大。形状(圆度)的差异没有统计学意义。
我们的结果表明,承受更高咀嚼负荷的牙齿(后牙)显示出更大和更明显的扇贝。这些发现可能对改善连接不同材料的其他界面感兴趣。