THE EFFECT OF SUPERSTRUCTURE MATERIAL ON STRESS DISTRIBUTION IN BONE AROUND IMPLANTS SUPPORTING FIXED PARTIAL DENTURE (IN VITRO STUDY)

Document Type : Original Article

Authors

1 Dental Biomaterials Department, Faculty of Dentistry, Damanhour University, Alexandria, Egypt

2 Professor, Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University.

3 Dental Biomaterials, Department of Dental Biomaterials, Faculty of Dentistry, Ain Shams University, Cairo, Egypt

Abstract

Background: The biomechanical behavior of dental implants differs from that of natural tooth which results in subsequent complications. The mechanism of stress distribution and loaditransferitoitheiimplant-boneiinterfaceiisiaicriticaliissueiaffectingitheisuccessiratesiof implants.
Aim of the study: This study aimed to evaluate the difference in stress/strain distribution initheiboneisurroundingiimplantsiresultingifromitheiuseiofithreeidifferentisuperstructureimaterialsiusingistrainigaugeianalysis.
Material and Methods: Polyurethane test block was used as a bone alternative; 2 bone level implants were inserted through a surgical guide into the blocks. Three-unit FDP frameworks were fabricated using three materials: group I: CAD/CAM BioHPP, group II: CAD-CAM zirconia and group III: metal framework FPDs. Vertical occlusal load was applied gradually at a constant rate of 1N per second up to a maximum of 150 N. The resulting strain around Implants was measured by strain gauge device.
Results: The lowest mean (SD) micro-strain value was recorded for group I: BioHpp, followed by group II: zirconia, and the highest mean micro-strain value was found in group III: metal; a statistically significant difference was found between group I (BioHPP) and group III (metal). However, no statistically significant difference was found between group I (BioHPP) and group II (zirconia).
Conclusion: Using BioHPP as a more resilient superstructure material had little effect on decreasing the stresses generated around dental implant.

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Alexandria Dental Journal
Volume 47, Issue 3
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
December 2022
Pages 116-124

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