Student Theses, Dissertations and Capstones

Document Type

Thesis - NSU Access Only

Degree Name

Master of Science (M.S.) in Dentistry

Copyright Statement

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Department

College of Dental Medicine

First Advisor

Jeffrey Thompson

Date of original Performance / Presentation

January 2021

Publication Date / Copyright Date

1-1-2021

Abstract

ABSTRACT Evaluation of the Shear Bond Strength of Reline Materials to Three Types of Denture Resin Materials Degree Date: July 2021 Bahareh Moradi, D.D.S, M.S. COLLEGE OF DENTAL MEDICINE, NOVA SOUTHEASTERN UNIVERSITY Thesis directed by: Dr. Jeffrey Thompson, B.S, Ph.D, Committee Chair Dr. Leila Ahmadian, D.D.S, M.S, Committee Member Dr. Mauricio Guerrero, D.D.S, Committee Member Objectives: CAD-CAM technology is routinely used for the fabrication of fixed and removable prostheses. Reline materials are used to connect the implant temporary cylinder to the acrylic full arch provisional in full mouth implant surgeries. These materials can be acrylic base or composite base. An adequate bond between the liner and denture base is essential. The objective of this in vitro study is to compare shear bond strength of four different denture base resin materials, fabricated by different techniques, to two different reline materials with and without conditioner. Methods: In this study two printable (Next Dent Denture 3D+ and Next Dent C&B MFH), one milled (Original Denture Base-Universal from Avadent), and one heat processed (Lucitone 199) denture base resins were studied. In total 192 samples were made as 20 mm x 20 mm x 3 mm plates. The reline materials of choice Jet Tooth Shade as PMMA base material and Quick Up as composite base material were bonded to the plates in a cylinder shape with or without applying SR Connect (Ivoclar Vivadent) conditioner. After thermocycling the shear bond strength was measured by a universal testing machine. After data collection, the statistical analysis was done using ANOVA followed by Tukey HSD adjustment. Also, the fracture mode was evaluated under stereo microscope. Results: The strongest bond was seen between NextDent Denture Base 3D+ and Quick Up without SR Connect followed by milled denture base (Original Denture Base-Universal) bonded to jet acrylic. The weakest bond was between Lucitone 199 Denture Base and Quick Up without SR Connect. In terms of bonding to Jet acrylic, milled denture base had the strongest bond with or without SR connect. SR connect did not have significant influence on the bond between milled denture base and Jet acrylic. Also, when it comes to bonding to Quick Up, printed materials (either denture base or crown and bridge) had the strongest bond. SR connect significantly decreased the bond between printed denture base and Quick Up. Conclusion: both conventional and milled denture bases had higher shear bond strength with resin base reline material, and printed materials had better performance with composite base reline material.

Disciplines

Dentistry

Keywords

denture base reline; milled denture base; printed denture base; shear bond strength

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