Evaluation of microstrain around distally inclined implant-supported fixed partial denture using low profile attachment (An in-vitro comparative study)

Document Type : Original Article

Authors

1 Department of Prosthodontics,Faculty of dentistry,Alexandria university,Alexandria,Egypt.

2 Department of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

3 Department of Prosthodontics,Faculty of Dentistry,Alexandria University,Alexandria,Egypt.

Abstract

INRTODUCTION: The microstrain (µε) around inclined implants will influence the selection of the type of attachment system. Studies that evaluated the microstrain around zirconium monolithic implant-supported posterior restorations with angled abutments and Low profile abutments with elastic Seeger System are lacking.
OBJECTIVES: The study aimed to assess the microstrain developed around angulated implants under vertical and oblique loading using two connection systems (OT BRIDGE and multiunit abutments (MUA) attachment systems) retained implant-supported zirconium monolithic three-unit fixed partial dentures (FPDs) using strain gauges.
MATERIALS AND METHODS: Two dummy implants were inserted in one epoxy resin class II Kennedy’s classification mandibular model. The anterior implant was positioned in a vertical 0º at the right second premolar, while the posterior implant was positioned at 30º distal angulation at the right second molar. Eight zirconium monolithic three-unit FPDs were digitally designed to be assigned to 2 main groups (n=4) according to the type of attachment system (OT BRIDGE attachment group, MUA attachment group). Each group received two loads (vertical 0º and oblique 30º) in a buccolingual direction from 0 to 100 N using a universal testing machine at the center of the FPDs.
RESULTS: The microstrain around the distally angulated implant with OT BRIDGES was significantly lower than MUA vertically but vice versa in 30º obliquely.
CONCLUSION: The microstrain was significantly affected by the type of attachment system. OT BRIDGE attachment can be utilised in place of MUA attachment over angulated implants in FPDs, as a favourable stress distribution was found by vertical loading.

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Alexandria Dental Journal
Volume 50, Issue 2
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
August 2025
Pages 143-151

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