Effect of uniaxial bending methods on the flexural strength and Weibull analysis of heat-polymerized, CAD/CAM milled, and 3D-printed denture base resins

IF 4.6 1区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Dental Materials Pub Date : 2025-01-06 DOI:10.1016/j.dental.2024.12.015

Abdulaziz Alhotan , Hanan Al-Johani , Ahmed Altarazi , Abdullah Alshamrani , Ahmed Mahmoud Fouda

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引用次数: 0

Abstract

Objectives

To compare the flexural strength and modulus of denture base resins manufactured by conventional methods, 3-dimensional (3D) printing, and computer-aided design and computer-aided manufacturing (CAD/CAM) milling using 3-point bending (3PB) and 4-point bending (4PB) methods after simulated aging.

Methods

Ninety bars (64 ×10 ×3.3 mm) were prepared from heat-polymerized (Lucitone-199), CAD/CAM milled (G-CAM), and 3D-printed (Denturetec) denture base resins (n = 30 per material). After 10,000 thermal cycles, specimens were subjected to either 3-point bending (3PB) or 4-point bending (4PB) (n = 15 per method) to measure the flexural strength (σ_3PB and σ_4PB) and elastic modulus (E_3PB and E_4PB) using a universal testing machine. Weibull analysis was performed to evaluate the reliability (m) and characteristic strength (σ₀) as a function of 3PB and 4PB. Fractographic analysis was conducted using scanning electron microscopy (SEM). Data were analysed using 2-way ANOVA followed by Tukey post hoc and Student t-tests (α=.05).

Results

Significant effects of material type and uniaxial bending method on flexural strength and modulus were found (P < .001). Irrespective of the flexural strength measurement approach, CAD/CAM milled resins exhibited significantly higher flexural strength in both methods (σ_3PB=125.6 ± 5.2 MPa, σ_4PB=110.5 ± 4.5 MPa) and elastic modulus (E_3PB=2400 ± 120 MPa and E_4PB=2800 ± 150 MPa) compared to 3D-printed and heat-polymerized resins. Irrespective of the denture base resin manufacturing method, σ_3PB was significantly higher than σ_4PB whereas E_4PB was significantly higher than E_3PB (P < .001). Weibull analysis exhibited highest reliability for CAD/CAM resins (m=25.24 – 43.83). Considerable microscopic differences were detected.

Significance

CAD/CAM milled denture base resins exhibited superior flexural properties compared with 3D-printed and heat-polymerized resins.

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来源期刊

Dental Materials 工程技术-材料科学：生物材料

CiteScore

9.80

自引率

10.00%

发文量

290

审稿时长

67 days

期刊介绍： Dental Materials publishes original research, review articles, and short communications. Academy of Dental Materials members click here to register for free access to Dental Materials online. The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology. Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.