Retention Of The Postior Resin-Bonded Partial Denture With A Modified Design And Short Term Follow-up

Part 1 Retention of The Postior Resin-Bonded Partial Denture with A Modified DesignObjective: The aim of this study was to test in vitro the resistance of a modified posterior resin-bonded fixed partial denture (PRBFPDs) to detachment by a universal testing machine.Methods: Extracted teeth were used to prepare specimens each consisting of a premolar and a molar with a space equivalent to a molar in between. Three groups were prepared ( n=10 ). Specimens of groap A were prepared to receive conventional PRBFPDs with proximal grooves, occlusal rests, and lingual wings. Specimens of groap B were prepared similarly to the ones of the groap A but with a rest strut instead of rests. Also the specimens of the groap C, but with slots instead. Castings were made and their fit surfaces micro-etched. Castings were cemented with 3MESPE and then separated from the abutments under tensile loading.Results: Mean separation forces were: Specimens of number 1=307 N, Specimens of number 2 = 45 1N, Specimens of number 3 = 554N.Conclusion: The modified PRBFPDs had better retention than conventional PRBFPDs.Part 2 Short Term Effect of The Postior Resin-Bonded Partial Denture with A Modified DesignObjective: The purpose of the prospective clinical follow-up was to evaluate the acceptability of resin-bonded fixed partial denture with a modified design used in KinnedyClass III patients over a short periodMaterials and methods: 18 missing teeth were restored with resin-bonded fixed partial denture with a modified design. The dentures were luted with Calibera?Resin Cement according to the manufacture's recommendation. The parameters considered as clinical failure retainers were displacement, detachment, Patients were reevaluated after 3,6,12 months.Results: Among all 18 postior resin-bonded fixed patial dentures, no prosthesis decementation was observed, No statistical significance of SBI and PI before and after rehabilitation.Conclusion: Over a period varying from 6 to 12 months, the resin-bonded fixed partial dentures showed good clinical results. Promising results of clinical service indicated that this modified design dentures maybe become a long-lasting restorations after a carefull case selection. Of course it needs further clinical follow-up.