【摘要】 本文对103枚人类恒磨牙(第一、二恒磨牙)根分叉部形态进行了测量观察,旨在探讨其对牙周治疗的影响。结果表明,上颌近-选中颊根和下颌近-远中根根分叉角度小于上颌近中颊-腭根或远中颊腭根根分叉角度。又由于国产龈下刮治器的工作面直径较宽,当根分叉角度较小时,器械到达根分叉部受限。因此,按照常规方法常难以对根分叉部进行良好的根面预备。此外,本研究还发现人类多根牙的根面沟凹陷出现率很高,上颌牙近中颊根和下颌牙近、远中根几乎总存在根面沟凹陷,且最大深度可达2mm,因此认为,其可能是根分叉部病变难以彻底消除的重要原因之一。更多还原

【Abstract】 Furcation morphology of 103 permanent molar teeth(only first and second molars)in human has been observed by the measuring methods to evaluate whether furcation morphology mayinfluence the periodontal treatment by using curettage. It was shown that the buccal furcation demension(of angle)of maxillary teeth tended to be smaller than either themesiopalatal or distopalatal,and so did the mesiodistal furcation demension of mandibular, teeth.Furthermore,the blade face diameter of the domestic curettes is usually too wide to enter furca tion, which makes it unlikely that curette used-alone will achieve adequate preparation of this area according to the routine procedures,It was also found that there are almost always concavities on the mesiobuCcal furcal aspect Of maxillary teeth and on mesial and distal furcal aspect of mandibular teeth,The maximal depth ofthese concavities is up to 2mm.The results may be considered to be one of the important reasons wh-y furcation involvement is not easy to eliminate.更多还原