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Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins

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Bonding between implant attachment pickup materials and CAD-CAM denture base material.

Meenarin Panittaveekul¹, Kamolphob Phasuk², John Levon³

¹Resident, Department of Prosthodontic Dentistry, Indiana University School of Dentistry, Indianapolis, Ind.

The Journal of Prosthetic Dentistry

|May 24, 2021

Summary

Acrylic resins like Jet and Duralay demonstrated superior bonding to prepolymerized polymethyl methacrylate (PMMA) denture bases compared to composite resins. This finding is crucial for improving the longevity of CAD-CAM dentures.

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Prosthodontics

Background:

Ensuring robust bonding between pickup materials and prepolymerized polymethyl methacrylate (PMMA) is critical for the success of computer-aided-design and computer-aided manufacturing (CAD-CAM) dentures.
Limited research exists on the bond strength between newer generations of prepolymerized PMMA and various chairside pickup materials.

Purpose of the Study:

To evaluate the bond strength of three distinct chairside implant LOCATOR attachment pickup material groups bonded to prepolymerized PMMA.
To compare the pushout force, an indicator of bond strength, among different pickup materials.

Main Methods:

Prepolymerized PMMA (Lucitone 199) disks were prepared with central holes.
Six pickup materials (composite resins with/without bonding agents, acrylic resins) were tested.
Axial pushout testing was performed on specimens, with half subjected to thermocycling.

Main Results:

Acrylic resins (Duralay, Jet denture repair acrylic) exhibited significantly higher pushout forces than composite resins, both with and without bonding agents.
Thermocycling generally maintained or slightly decreased bond strength, with notable exceptions in specific composite groups.
Fracture pattern analysis revealed variations among material groups, correlating with pushout force.

Conclusions:

Jet denture repair acrylic and Duralay demonstrate superior adhesion to Lucitone 199 CAD-CAM denture base material.
These acrylic resins offer a more reliable bond compared to tested composite resins, including those with bonding agents.
Findings suggest acrylic resins are preferable for chairside pickup applications with this CAD-CAM PMMA material.