Introduction: Aim of the study was to assess the impact of the length of mini-implants inserted in the midpalatal\r\nregion on the stability at the initial healing period.\r\nMethods: A sample of 20 consecutively treated patients (15.6 �± 7.2 years) was examined. A long mini-implant with a\r\nlength of 11 mm and a diameter of 2 mm was inserted into the anterior palate of each patient. Resonance frequency\r\nanalysis (RFA) was performed after insertion (T0), two weeks (T1), four weeks (T2), and six weeks (T3). Insertion depth\r\n(ID) and the maximum insertion torque (IT) were measured. RFA, ID and IT data were tested for correlations. RFA\r\nvalues were tested for statistical differences between the different times. Data was compared to a matched control\r\ngroup of patients who received short mini-implants with a length of 9 mm and a diameter of 2 mm.\r\nResults: 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\n(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\r\n(P < .001) and significantly from T1 and T2 (P < .05) by 3.5 �± 3.7 ISQ values. From T2 on RFA nearly remained\r\nunchanged (-1.7 �± 3.9 ISQ; P > .05). At T1 stability was significantly lower than the control group. From T2 on there\r\nwere no significant differences between the groups.\r\nConclusions: Long mini-implants provide high stability when inserted in the midpalatal region. After initial decrease\r\nRFA values remained stable from four weeks on and did not differ from the control group.
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