[The labial and palatal bone thickness in 67 young adults with normal occlusion at the maxillary anterior teeth measured by cone-beam computed tomography].
OBJECTIVE
To investigate the labial and palatal bone thickness of the maxillary anterior teeth in normal young adults on different reference lines, in order to provide references for clinical treatment.


METHODS
Sixty-seven eligible Han nationality young volunteers were scanned by cone-beam computed tomography (CBCT). The labial and palatal bone thickness and the labial bone morphology of the anterior teeth were measured after reconstruction. Paired-sample t test, independent- sample t test, one-way ANOVA and Chi-square test were performed using SPSS17.0 software package.


RESULTS
(1)The mean labial bone thicknesses at L1 of canines and L5 of all anterior teeth were more than 1.00 mm, while the thickness of the other labial measurement sites were less than 1.00 mm. The mean palatal bone thickness was more than 1.00 mm. (2) The labial bone was thinner than the palatal bone (P<0.001). (3)The labial bone was the thinnest at L3 and L4 of the anterior teeth (P<0.001). The thickness of palatal bone gradually increased from the L1 to L5(P<0.001). (4)The frequency of the labial bone thinner than 1.00 mm was less than 50% at L2 of canines and L5 of all anterior teeth; The frequency of the labial bone deficiency at L3 and L4 of lateral incisors and L4 of canines was more than 50% in males. (5)The mean buccal bony curvature of canines was larger than that of incisors in males. The distance between root apex and the deepest point of buccal bony curvature was the largest in maxillary central incisors zone in males, while there was no significant difference in females.


CONCLUSIONS
The alveolar bone thickness of the maxillary anterior teeth in normal young adults are quite thin or even deficient, and there is diversity of the thickness and morphology between labial and palatal bone.
Key Laboratory of Oral Medicine, School and Hospital of Stomatology, Guangzhou Medical University. Guangzhou 510140, Guangdong Province; China. E-mail:yijxs88@163.com.
Xiao-shi
XS
Jia
Qiu-xia
QX
Zhang
Meng-jie
MJ
Xu
Meng
M
Wang
Peng
P
Zhang
D054893:Cone-Beam Computed Tomography; D003481:Cuspid; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008437:Maxilla; D055815:Young Adult