engleski

The 3-years longitudinal study of mini dental implants for retention of removable pratial denture in Kennedy class 1 patients

OBJECTIVES: To evaluate clinical and radiographic performance of slim mini dental implants (MDI) in strategic positions to retain and support partial removable dentures (RPDs). MATERIALS AND METHODS: A convinience sample of 76 partialy edentulous patients without posterior teeth, Kennedy Class I and slim alveolar ridges (<5 mm) were included. Two MDIs (2.0-2.5 mm wide, 10-14 mm long) inserted adjecent to the last tooth or at one-tooth width posteriorly changed linear into more favorable polygonal denture support. The RPDs had lingual or palatal plate major connectors. The marginal bone loss (MBL) at the mesial and distal side was assessed on periapical and/or panoramic radiographs. The magnification error was corrected: corrected crestal bone level = measured crestal bone level × actual implant length/measured implant length. Implant success and survival rates, plaque index, technical difficulties, and patient centered outcomes were assessed. RESULTS: Four implants were lost before loading, but were substituted, one failed again and that patient was excluded, finally 152 implants were loaded resulting in 97, 4% surgical success. Two patients lost one MDI each after 1 year in the maxilla. Two MDIs were further lost in the maxilla and two in the mandible after 3 years. The survival rate of loaded implants was 96%, total survival rate 93.6% (2.6% early implant loss + 4% late implant loss). There was no severe periimplantitis, median plaque score was 1 ; at the 1-year follow-up MBL ranged from 0.0 - 1.9 mm (x=0.61 ±0.52 mm) ; at the 3-year from 0.0 – 2.4 mm (56 patients) (x=0.70 ±0.71 mm). No denture fractures (CrCo framework) were reported. At the 1st year examination one matrix loosening and 2 o-rings loss were found ; 2 more matrices loosening, 3 o-rings loss and 8 o- rings that needed replacement were found. After the treatment the OHRQoL (OHIP4) and chewing function (CFQ) significantly improved and remained consistent. CONCLUSION: Based on the study results, the MDI retained RPD is a feasible treatment option in partially edentulous patients with slim alveolar ridges.

Edentulous Mandible ; Overdentures ; Mini Dental Implants

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