The effect of varying healing times on orthodontic mini-implant stability: a microscopic computerized tomographic and biomechanical analysis

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• 作者：Qiang  ; Zhang PhD^a ;   ; ^b ;   ; ^c ; Lixing  ; Zhao PhD^a ;   ; ^b ;   ; ; Yeke  ; Wu PhD^a ;   ; ^b ; Hui  ; Wang MS^a ; Zhihe  ; Zhao DDS ; PhD^a ;   ; ^b ;   ; ^{hx_zhaozhihe@tom.com} ; Zhenrui  ; Xu PhD^a ;   ; ^b ; Xing  ; Wei PhD^a ;   ; ^b ; Tian  ; Tang PhD^a ;   ; ^b
• 刊名：Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：112
• 期：4
• 页码：423-429
• 全文大小：1648 K

文摘

Objective

The aim of this study was to evaluate the effect of different healing times on the stability of titanium mini-implants used for orthodontic anchorage.

Study design

Eight male beagles were used and randomized into 4 groups according to different healing times (1, 3, 5, and 7 weeks); each group had 2 beagles. Sixty-four mini-implants were inserted bilaterally in the maxilla and mandible of the beagles. Microscopic computerized tomography (¦ÌCT) and pull-out test were used for morphometric and biomechanical analysis, respectively.

Results

All ¦ÌCT parameters and F_max (maximum pull-out force) increased with the prolongation of healing time. One week after insertion, all 4 measurements, namely osseointegration, trabecular bone volume density, intersection surface, and F_max, were lower in the maxilla group than in the mandible group (P < .05). Between the span of 1 and 3 weeks after insertion, a more obvious rising tendency of the 4 values was observed in the maxilla group than in the mandible group. Five and 7 weeks after insertion, the maxilla group expressed higher values of the 4 measurements than the mandible group (P < .05).

Conclusions

Although insertion in the mandible could provide higher primary stability for mini-implants, with the prolongation of healing time, insertion in the maxilla achieves higher osseointegration. The results indicated that insertion in maxilla has a more positive effect on the stability of mini-implants than insertion in the mandible.