Primary stability of mini-screw: buccal cortical thickness in maxillary posterior area of malocclusion

doi:10.3969/j.issn.2095-4344.2015.12.007

Abstract

Abstract:

BACKGROUND: Mini-screw stability is primarily related to alveolar bone cortical thickness. It is necessary to learn cortical thickness to choose suitable implanting sites and predict success rate.
OBJECTIVE: To evaluate the buccal cortical thickness in maxillary posterior area of Class II Division I malocclusion adolescents.
METHODS: Fifty-two adolescents (including 26 male and 26 female) of Class II Division I malocclusion scanned by Cone Beam Computer Tomography were involved in this study. The buccal cortical thickness of six posterior interradicular sites (14-15, 15-16, 16-17, 24-25, 25-26, 26-27) at four bone levels (2, 4, 6, 8 mm) from the
alveolar crest in both boys and girls were measured.
RESULTS AND CONCLUSION: (1) There was no statistically significant difference in alveolar cortical thickness between left and right sides in the girls (P > 0.05); cortical thickness of 5-6 and 6-7 at 8 mm was thicker than that at 2 mm (P < 0.05) and cortical thickness of 6-7 at 2 mm was smaller than that at 8 mm (P < 0.05). The cortical thickness increased from crest to base of alveolar crest and reached the peak at 8 mm. Cortical thickness of 6-7 was thicker than 4-5 at 8 mm depth (P < 0.05). The results of males were the same as females. (2) There was no statistically significant difference in alveolar cortical thickness of the same site between males and females (P > 0.05). All sites in this study were suitable for mini-screw implantation; from the first molar to posterior dental arch, buccal cortical thickness is well-distributed; it is dangerous for implantation in the areas around the first molar more than 6 mm, where the frequent presence of the maxillary sinus is observed. There is an increase of buccal cortical thickness from crest to base of alveolar crest, obtaining good initial stability.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: Dental Implants, Alveolar Bone Loss, Denture Retention

CLC Number:

R318

Zou Shuang-shuang, Lei Yong-hua, Zhang Ya-mei, Liu Lu. Primary stability of mini-screw: buccal cortical thickness in maxillary posterior area of malocclusion[J]. Chinese Journal of Tissue Engineering Research, 2015, 19(12): 1837-1841.

Figures/Tables 2

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