engleski

The effect of technological manufacturing process on the mechanical performance and binding strength of building materials of dentures

Computer-aided design/computer-aided manufacturing (CAD/CAM) technology is one of the fastest-growing aspects of modern dentistry, effecting all disciplines of dentistry, especially the fields of prosthodontics and restorative dental medicine. New materials and techniques are being continuously improved. The data about digital technologies and mechanical properties of these materials are scarce. The aim of the first part of the present study was to estimate and collate the mechanical properties of different materials and technologies for denture base manufacturing. The evaluated mechanical properties were flexural strength, surface hardness, and impact strength. The aim of the second part of the present study was to define the shear bond strengths of different denture base resins to different types of prefabricated teeth (acrylic, nanohybrid composite, and cross-linked) and denture teeth produced by CAD/CAM technology (milling). Milled CAD/CAM materials for denture base fabrication showed enhanced mechanical properties when compared to heat-polymerized and 3D printed acrylics. 3D printed acrylics had mechanical properties lower than the majority of other tested denture base resins. Nevertheless, material’s polymerization type cannot guarantee its optimal mechanical properties. When comparing shear bond strengths between denture base materials and prefabricated teeth, heat-polymerized and milled CAD/CAM denture base resins showed higher shear bond strength values compared to the cold- polymerized ones. Cold-polymerized resins should be averted for binding artificial teeth to denture base resins. Denture teeth glued to a milled CAD/CAM denture base resin by using a bonding agent show the same shear bond strength values as the denture teeth adhered to heat-polymerized denture base resins.

acrylic resin ; flexural strength ; surface hardness ; complete denture ; digital denture ; prefabricated teeth

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