Abstract
IntroductionAim 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.MethodsA 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.ResultsMean 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.ConclusionsLong 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 registrationID: 2013081293 (Clinical study register, University of Düsseldorf, Germany).
Highlights
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
Soft tissue thicknesses at the insertion site were found to be nearly identical in both groups (STT: 1.55 ± 0.60 mm vs. 1.50 ± 0.55 mm)
Long 11 mm mini-implants provide a high level of stability when inserted at the midpalatal region
Summary
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. Different lengths and diameters as well as conical or cylindric shapes were tested for their influence on primary stability [9,10]. Most of these investigations are in-vitro studies. In the clinical studies insertion torque is mostly used as a measure for primary stability The validity of this parameter to assess implant stability and to predict success, is still controversial [11]. In addition it only allows assessing initial stability but not secondary stability which is even of more relevance for clinical success
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