Lammertyn Paola A, Rodrigo Susana B, Brunotto Mabel, Crosa Marta
Department of Endodontics, Fundacion CREO, Cordoba, Argentina.
J Endod. 2009 Jun;35(6):814-7. doi: 10.1016/j.joen.2009.03.012.
Few studies mention the presence of furcation grooves in the palatal aspect of buccal roots in upper first premolars. Anatomic characteristics like external grooves or root curvatures predispose teeth to weakening during post placement. Roots with a large number of external sulci show more canal variations. Previous research found that the palatal wall is on average less than 1mm. There is a direct relation between the volume of dental structures and the capacity to resist occlusal loads. The purpose of this study was to evaluate the changes in dentin thickness and structures adjacent to the furcal groove.
The percentage that represented furcation groove in the buccal root was specified. The sample size selected was n=20. Three horizontal slices were made to the buccal root, coronal, middle, and apical. The angles of the grooves and dentin thickness were measured with a profile projector.
In the coronal third, the depth of the groove was correlative with dentin thickness negatively, ie, while the depth increased, palatal dentin thickness decreased or vice versa. In the coronal and middle thirds, the palatal wall showed average dentin width smaller than the buccal. In some cases, the thickness was less than 1mm. In the apical third, palatal dentin thicknesses showed higher averages than the buccal. Structural changes were observed in dentin adjacent to the furcation groove. These results are discussed in the context of other research. Methodologic differences do not enable comparative studies.
Dentin thickness corresponding to the furcal groove is variable; it presents structural changes and must be taken into account in endodontic and prosthetic procedures.
很少有研究提及上颌第一前磨牙颊根腭侧存在根分叉沟。诸如外部沟或牙根弯曲等解剖特征会使牙齿在桩置入过程中易于变弱。具有大量外部沟的牙根显示出更多的根管变异。先前的研究发现腭侧壁平均厚度小于1毫米。牙齿结构的体积与抵抗咬合负荷的能力之间存在直接关系。本研究的目的是评估与根分叉沟相邻的牙本质厚度和结构的变化。
确定颊根中根分叉沟所占的百分比。选择的样本量为n = 20。对颊根进行三个水平切片，分别为冠部、中部和根尖部。用轮廓投影仪测量沟的角度和牙本质厚度。
在冠部三分之一处，沟的深度与腭侧牙本质厚度呈负相关，即深度增加时，腭侧牙本质厚度减小，反之亦然。在冠部和中部三分之一处，腭侧壁的平均牙本质宽度小于颊侧。在某些情况下，厚度小于1毫米。在根尖三分之一处，腭侧牙本质厚度的平均值高于颊侧。在与根分叉沟相邻的牙本质中观察到结构变化。这些结果在其他研究的背景下进行了讨论。方法学上的差异无法进行比较研究。
与根分叉沟相对应的牙本质厚度是可变的；它呈现出结构变化，在牙髓治疗和修复程序中必须予以考虑。
