A Comparative Evaluation of Shear Bond Strength Between Different Soft Liners to Heat-Cured Acrylic Resin Versus 3D Printed Denture Bases (An In-Vitro Study)

Document Type : Original Article

Authors

1 Lecturer of Removable Prosthodontics Department, College of Oral and Dental Surgery, Misr University for Science and Technology, Giza, Egypt.

2 Lecturer of Dental Biomaterials, College of Oral and Dental Medicine and Surgery, Misr University for Science and Technology, Giza, Egypt

Abstract

Abstract:
Introduction: It is crucial to study the interaction between chairside softliners and the most recent denture base materials, as it is vital in ensuring optimal results.
Objective: To compare the shear bond strength of two chairside softliners using traditional heat-cured acrylic resin and innovative 3D-printed denture base resin material.
Materials and Methods: 80 specimens with 50 x 10 x 3 mm dimensions were produced. The specimens were classified into two groups (n = 40) based on the type of denture base material used: heat-cured acrylic resin and 3D-printed resin. Each group was divided into two subgroups (n = 20), resulting in ten pairs (n = 10) per subgroup. The subgroups were distinguished based on the type of soft-liner material bonded to the denture base: subgroup A used a silicon-based soft liner, while subgroup B used an acrylic-based soft liner.
Results: According to the study, the group that used heat-cured PMMA (Group I) had a significantly higher shear bond strength of (0.632 MPa) compared to the 3D printed group (Group II) with a shear bond strength of (0.397 MPa). Moreover, the silicon-based soft-liner subgroups had a slightly higher shear bond strength (0.566 MPa) than the acrylic-based soft-liner subgroups (0.463 MPa). However, this difference was not statistically significant.
Conclusion: Heat-cured acrylic resin material showed higher shear bond strength than 3D-printed resin material. The silicone-based soft liners had better shear bond strength than the acrylic-based soft liners.

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Egyptian Dental Journal
Volume 71, Issue 1 - Serial Number 4
January (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
January 2025
Pages 575-586

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