FOUR IMPLANT SUPPORTED MANDIBULAR OVERDENTURES WITH RIGID TELESCOPIC ATTACHMENTS. A STUDY OF CIRCUMFERENTIAL BONE RESORPTION USING CONE BEAM COMPUTERIZED TOMOGRAPHY

Abstract

Aim: This study aimed to evaluate circumferential bone resorption around implants supporting mandibular overdentures with rigid telescopic attachments. Materials and methods: Eight totally edentulous participants with adequate remaining bone mesial and distal to the mental foramen received four implants in canine and first molar areas of the mandible. After 3 months of osseointegration, telescopic attachments were connected to the denture. Marginal bone resorption was measured around canine and molar implants using Cone beam computerized tomography (CBCT) at base line, 6 months (6m), and 12 months (12m) after overdenture insertion. Results: The survival rate was 97% after one year. The mean marginal bone resorption at all implant surface combined together is 1.41±.54mm. Posterior implants were associated with significant higher marginal bone resorption than anterior implants for distal, lingual and mesial surfaces. The highest marginal bone resorption was noted at the lingual surface followed by mesial surface, then distal surface and the lowest marginal bone resorption was noted with buccal surface. For lingual, mesial and buccal implant surfaces of anterior implants, bone resorption at 12m was significantly higher than bone loss at 6m. Conclusion: Despite the limitation of this study, implants supporting mandibular overdentures with rigid telescopic attachments is a successful treatment option for edentulous mandible. However, this treatment modality is associated with increased bone loss around molar implants compared to canine implants. Also, the lingual implant surface was associated with significant higher bone resorption than other implant surfaces after one year of loading.