摘要
目的:了解上下颌第一磨牙牙釉质及牙本质的厚度。方法:用电子测量尺测量23颗上颌第一磨牙和18颗下颌第一磨牙牙合面不同部位牙釉质、牙本质的厚度。结果:牙合面突起结构组织厚度(牙釉质:上颌(1.36±0.27)mm,下颌(1.61±0.27)mm;牙本质:上颌(4.13±0.40)mm,下颌(4.2±0.47)mm大于各自牙合面凹形结构上颌(0.92±0.42)mm,下颌(1.12±0.38)mm;牙本质:上颌(3.15±0.42)mm,下颌(3.32±0.30)mm,P<0.05),下颌牙釉质厚度多大于上颌(P<0.01),但牙本质厚度无此差异(P>0.05)。结论:上下颌第一磨牙硬组织厚度在合面不同结构之间以及上下牙同名部位之间存在不同程度的差异。
Objective： To measure the thickness of enamel and dentin of the first molars. Methods： The thickness of enamel and dentin at different positions of 23 upper first and 18 lower first molars were measured by electronic ruler. Results： The thicknesses of the enamel and dentin at the convex structures, such as cusps and marginal ridges, （ 1.36 ± 0.27） mm for upper molar enamel, （1.61 ±0.27） mm for lower molars enamel, （4.13±0.40） mm for upper molar dentin and （4. 2±0.47 ） nun for lower molar dentin, were bigger than those at central parts of occlusal surface, （ 0.92±0.42 ） nun for upper molars enamel, （ 1.12±0.38 ） mm for lower molars enamel, （ 3.15±0.42） mm for upper molar dentin and （ 3.32±0.30） nun for lower molar dentin （P 〈0.05）. The upper molar had thinner enamel than lower molar （P 〈0.01 ）, hut the dentin thickness did not show this difference （P 〉 0.05 ）. Conclusion： The enamel and dentin thickness differs between upper and lower first molar, and between the different structures on the occlusal surface of molars. There were significant differences among the thickness of the enamel at different positions of occlusal surface, so do the thickness of the enamel at counterparts between upper and lower jaws.
出处
《口腔医学研究》
CAS
CSCD
2006年第2期137-139,共3页
Journal of Oral Science Research
