Advisor(s)
Ramtin Sadid Zadeh
Committee Member(s)
Amjad Javed
Nathaniel Lawson
School
School of Dentistry
Document Type
Thesis
Department (new version)
Dentistry
Date of Award
1-6-2025
Abstract
Background: Three-dimensional (3D) printing has revolutionized dentistry by enabling the fabrication of interim restorations that protect prepared teeth and maintain aesthetics and function during prosthesis creation. These interim shells often require relining with composite resins for precise fitting and enhanced durability, relying on achieving a strong shear bond strength (SBS) between the 3D-printed shell and the composite resin. Surface roughness and texture are critical factors that create micro-mechanical retention sites, enhancing SBS by increasing surface area and improving adhesive properties through techniques like air-abrasion. Research into novel surface textures mimicking natural dentinal tubules aims to further boost bond strength, comparing these innovations with established materials like PMMA and bis-acryl composites known for their reliable bonding characteristics, thus advancing interim restorations for improved patient outcomes. Purpose: The aim of this invitro study was to assess and contrast the shear bond strength between a composite resin and 3D-printed resins with various surface textures. Methods: Cylindrical specimens (Ø20×10 mm) were designed using CAD software (Onshape CAD, Onshape) with various surface textures: A) no texture; B) pores spaced 80 microns apart [20x20 (diameter x depth) microns]; C) pores spaced 200 microns apart (50x50 microns); D) pores spaced 400 microns apart (100x100 microns); E) pores spaced 600 microns apart (150x150 microns); F) pores spaced 800 microns apart (200x200 microns). One hundred and eight specimens then were manufactured from a resin (Dentca C&B, Dentca) using a 3D-printing machine (DLS Carbon3D), 18 each group. Additionally, cylinders with the same dimensions were fabricated from bis-acrylic composite resin (Integrity; Dentsply Sirona) and PMMA (Jet Acrylic; Lang Dental), 18 each. The bonding surface of specimens with no surface texture, and ones fabricated from bis-acrylic composite resin and PMMA were sandblasted with 50 microns Al2O3 at 2 bar pressure from a distance of 10 mm for 60 seconds. All specimens were then cleaned, and evaluated using a 3D surface analyzer (VR 5000; Keyence). A composite resin (Tetric Evoflow, Shade A4; Ivoclar) was used to bond a cylinder of 5x3 (diameter x height) mm to the bonding surface of specimens following the application of an adhesive (Adhese universal; Ivoclar). After storage in distilled water for 24 hours, shear bond strength of composite resin to the specimens was measured using a universal testing machine (Bluehill universal; Instron) with a cross head speed of 1 mm/min, and failure modes (cohesive, adhesive, or mixed) were assessed using the 3D surface analyzer (VR 5000, Keyence). One-way ANOVA, followed by the Tukey HSD test was used to compare the impact of surface texture on the shear bond strength at a significance level of 0.05. Failure modes were reported descriptively. Results: The one-way ANOVA revealed significant differences in shear bond strength among the groups (F = 11.50, p < 0.0001). The highest shear bond strength was observed in the sandblasted bis-acrylic composite resin group, with a mean SBS of 15.34 MPa, outperforming all other materials tested. Conclusion: In conclusion, while introducing surface textures on 3D-printed resins influenced shear bond strength, sandblasting has an effective impact on improving SBS of composite resin to 3D-printed resin.
ProQuest ID
Recommended Citation
Surabathula, Venkata Sruthi, "Shear Bond Strength Of A Composite Resin To 3D-Printed Resins With Various Designed Surface Texture: An In-Vitro Study" (2025). All ETDs from UAB. 7295.
https://digitalcommons.library.uab.edu/etd-collection/7295
