Impact of mini-implant length on stability at the initial healing period: a controlled clinical study

Head & Face Medicine

Dieter Drescher¹  Alexander Pauls²  Benedict Wilmes¹  Manuel Nienkemper¹ 

[1] Department of Orthodontics, Heinrich-Heine-University, Moorenstr. 5, 40225 Düsseldorf, Germany;Orthodontist, private practice, Gersthofer Str. 2, 65929 Frankfurt am Main, Germany

关键词: Resonance frequency analysis;    Healing;    Length;    Stability;    Mini-implants;    Skeletal anchorage;   

Others  :  813684
DOI  :  10.1186/1746-160X-9-30

 received in 2013-08-20, accepted in 2013-10-09,  发布年份 2013

【 摘 要 】

Introduction

Aim of the study was to assess the impact of the length of mini-implants inserted in the midpalatal region on the stability at the initial healing period.

Methods

A sample of 20 consecutively treated patients (15.6 ± 7.2 years) was examined. A long mini-implant with a length of 11 mm and a diameter of 2 mm was inserted into the anterior palate of each patient. Resonance frequency analysis (RFA) was performed after insertion (T0), two weeks (T1), four weeks (T2), and six weeks (T3). Insertion depth (ID) and the maximum insertion torque (IT) were measured. RFA, ID and IT data were tested for correlations. RFA values were tested for statistical differences between the different times. Data was compared to a matched control group of patients who received short mini-implants with a length of 9 mm and a diameter of 2 mm.

Results

Mean ID was 9.5 ± 0.6 mm and mean IT was 17.9 ± 3.8 Ncm. A correlation was found between RFA and ID (r = 0.59, P < .01). From T0 to T1 the stability (33.4 ± 3.5 ISQ) decreased highly significantly by 5.3 ± 3.5 ISQ values (P < .001) and significantly from T1 and T2 (P < .05) by 3.5 ± 3.7 ISQ values. From T2 on RFA nearly remained unchanged (−1.7 ± 3.9 ISQ; P > .05). At T1 stability was significantly lower than the control group. From T2 on there were no significant differences between the groups.

Conclusions

Long mini-implants provide high stability when inserted in the midpalatal region. After initial decrease RFA values remained stable from four weeks on and did not differ from the control group.

Trial registration

ID: 2013081293 (Clinical study register, University of Düsseldorf, Germany).

【 授权许可】

   
2013 Nienkemper et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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