Next Article in Journal
The Formation Mechanism and Corrosion Resistance of a Composite Phosphate Conversion Film on AM60 Alloy
Previous Article in Journal
Electrospun F18 Bioactive Glass/PCL—Poly (ε-caprolactone)—Membrane for Guided Tissue Regeneration
Open AccessArticle

In Vitro Analysis of the Fracture Resistance of CAD/CAM Denture Base Resins

1
University Hospital for Cranio-Maxillofacial and Oral Surgery, Department of Dental and Oral Medicine and Cranio-Maxillofacial and Oral Surgery, Medical University of Innsbruck, Anichstr. 35, A-6020 Innsbruck, Austria
2
University Hospital for Dental Prosthetics and Restorative Dentistry, Department of Dental and Oral Medicine and Cranio-Maxillofacial and Oral Surgery, Medical University of Innsbruck, Anichstr. 35, A-6020 Innsbruck, Austria
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 401; https://doi.org/10.3390/ma11030401
Received: 12 February 2018 / Revised: 3 March 2018 / Accepted: 4 March 2018 / Published: 8 March 2018
Computer-aided design and computer-aided manufacturing (CAD/CAM) denture base manufacturers claim to produce their resin pucks under high heat and pressure. Therefore, CAD/CAM dentures are assumed to have enhanced mechanical properties and, as a result, are often produced with lower denture base thicknesses than conventional, manually fabricated dentures. The aim of this study was to investigate if commercially available CAD/CAM denture base resins have more favourable mechanical properties than conventionally processed denture base resins. For this purpose, a series of three-point bending tests conforming to ISO specifications were performed on a total of 80 standardised, rectangular CAD/CAM denture base resin specimens from five different manufacturers (AvaDent, Baltic Denture System, Vita VIONIC, Whole You Nexteeth, and Wieland Digital Dentures). A heat-polymerising resin and an autopolymerising resin served as the control groups. The breaking load, fracture toughness, and the elastic modulus were assessed. Additionally, the fracture surface roughness and texture were investigated. Only one CAD/CAM resin showed a significantly increased breaking load. Two CAD/CAM resins had a significantly higher fracture toughness than the control groups, and all CAD/CAM resins had higher elastic moduli than the controls. Our results indicate that CAD/CAM denture base resins do not generally have better mechanical properties than manually processed resins. Therefore, the lower minimum denture base thicknesses should be regarded with some caution. View Full-Text
Keywords: CAD/CAM dentures; complete dentures; dental materials; PMMA resin; breaking load; fracture toughness; elastic modulus CAD/CAM dentures; complete dentures; dental materials; PMMA resin; breaking load; fracture toughness; elastic modulus
Show Figures

Figure 1

MDPI and ACS Style

Steinmassl, O.; Offermanns, V.; Stöckl, W.; Dumfahrt, H.; Grunert, I.; Steinmassl, P.-A. In Vitro Analysis of the Fracture Resistance of CAD/CAM Denture Base Resins. Materials 2018, 11, 401.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop