engleski

Mini dental implant failures in removable dentures: a retrospective study

OBJECTIVES: To identify reasons for mini dental implant (MDI) failure used for retention of removable overdentures. METHODS: A total of 324 patients with complete or partial MDI retained removable overdentures (4, 3 or 2 MDIs) participated. Respective patients wore dentures 2 to 10 years. Patients were advised to come for a control exam once a year or anytime when having problems. Modified plaque index, bone resorption at MDI site, matrix loosening, o-ring wear, denture stability and mucosa thickness of the denture-bearing area were observed. RESULTS: A total of 978 MDIs were loaded and 68 (6.9%) MDIs failed during denture wearing. Two MDIs (2.9%) were broken after traumatic head injury (patient fainted). Flabby ridge or oral mucosa thicker than 3.5 mm posteriorly, with denture subsidence under masticatory loads caused 51 MDIs failures (fracture or loosening: 75%), one patient was a severe bruxer (2 MDIs, 2.9%). Due to unstable denture (patient did not come for a recall and denture was not relined when needed) 7 MDIs (10.2%) failed and because of a lack of oral hygiene only 6 MDIs (8.8%) were lost (periimplantits). Modified plaque index had median value 1 ; 16 matrices loosened ; 98 O- rings were changed, 30 dentures were relined. Most of MDIs showed no periimplant bone resorption. CONCLUSION: The most common reasons for MDI failure after loading were flabby ridge and/or unstable dentures. Flabby ridge removal and/or vestibuloplasty should be performed prior or during MDI insertion.

mini dental implants ; failures ; removable dentures

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