Assessment of Hardness, Flexural Modulus, and Bond Strength of Acrylic Denture bases Fabricated by 3D Digital Methods

Abstract

Objectives:The inferior mechanical properties and the clinical failure of the denture bases could be related to their processing technique and the type of resin used during fabrication.Therefore, this study aimed to evaluate and compare the effect of the processing technique on the hardness, flexural modulus, and bond strength of the different denture base resins. Materials and Methods:Three processing techniques were used in the present study to fabricate the tested samples; compression-molded fabrication method "control group", and two different three-dimensional (3D) fabrication methods (CAD/CAM milled "subtractive", and 3D printed "additive"). The samples used in this study fabricated with different dimensions according to the type of test (hardness, flexural modulus, and shear bond strength). Results:The results of hardness and flexural modulus revealed that; the CAD/CAM milled samples showed statistically significant higher hardness and flexural modulus values followed by the conventional compression molded and 3D printed respectively. While the results of shear bond strength showed no statistically significant difference among the three different processing methods. Conclusion:the processing technology has a significant effect on the hardness and flexural modulus of the material. While there is no effect to the fabrication technique on the teeth bond strength.

Effect of Beverage Solutions on Surface Roughness of PEEK CAD –CAM, 3D Printing Denture Base and Heat Cure Acrylic Resin Denture Base Materials

“…With the advancement of digital technology, new CAD-CAM-based material processing processes for dentistry, such as subtractive milling (SM) and additive manufacturing (AM), have emerged (4) . The advantage of constructing denture bases digitally is the ability to create dentures in less time and with fewer processing stages (5) . Additive 3D printing has been found to offer several advantages over subtractive milling, including the ability to build intricate forms, being less expensive due to less material waste, and not exhibiting rotary burr wear (6).…”

“…The outcomes for the effect of beverage media on the surface roughness of heat cure acrylic denture base, mean and standard deviation Table (5) demonstrated that all beverage solutions raised the surface roughness of heat cure acrylic, with cola achieving the highest levels in comparison to the control group. One-way analysis of variance (ANOVA) Table (6) revealed that whole beverage solutions showed a statistically significant impact on the surface roughness of heat cure acrylic denture base (at p ≤ 0.05).…”

“…One-way analysis of variance (ANOVA) Table (6) revealed that whole beverage solutions showed a statistically significant impact on the surface roughness of heat cure acrylic denture base (at p ≤ 0.05). Duncan s Multiple comparison Test Table (5) demonstrated that the effect of all forms of beverage solutions significantly roughened the surface roughness of heat cure acrylic denture base (at p ≤ 0.05).…”

Effect of Beverage Solutions on Flexural Strength of PEEK CAD –CAM, 3D Printing Denture Base and Heat Cure Acrylic Resin Denture Base Materials

“…With the advancement of digital technology, novel CAD-CAM-based procedures for material processing in dentistry, such as subtractive milling (SM) and additive manufacturing (AM), have emerged (3) . One advantage of fabricating denture bases digitally is the ability to create dentures in less time and with fewer processing steps, digital methods were also developed to address possible processing issues that may arise when the standard conventional procedure is used (4) . Additive 3D printing has several benefits over subtractive milling, including the ability to create intricate forms, being less expensive due to less material waste, and not exhibiting rotary burr wear (5) .…”