A comparison of the mechanical properties of 3D-printed, milled, and conventional denture base resin materials
Year: 2024
Type: article
Abstract: Recent digital dentistry advancements have significantly increased the use of digital technology in denture fabrication 4,5) .This innovative approach is under active implementation and application in clinical settings as it can replace traditional methods, mitigating the drawbacks of polymerization shrinkage, labor, and working time.The utilization of digital dentistry advancements in denture fabrication not only streamlines the process but also enhances processing accuracy through simplified fabrication procedures 6,7) .Computer-aided manufacturing (CAM) involves subtractive machining, in which PMMA blocks are milled.Consequently, wear and tear of the milling machine during the cutting process is unavoidable, and the process is limited to only approximately 90% of the PMMA block 8,9) .In contrast, additive manufacturing methods, such as three-dimensional (3D) printing, enable the fabrication of more complex structures.Additive manufacturing also allows for a reduction in material consumption of nearly 40% and eliminates concerns about milling machine wear and tear 10) .Denture bases are susceptible to fracture owing to prolonged exposure to physical stresses caused by mastication.Therefore, denture bases must possess sufficient strength and resilience to withstand such forces without fracturing 11) .Flexural strength refers to the maximum bending stress at the fracture point, and dentures with higher flexural strength exhibit better resistance to fracture 12) .Sustained flexural stress caused by mastication can lead to creep, resulting in a damping effect and potential deformation.To prevent this, denture bases should exhibit appropriate elasticity and stiffness 13) .Additionally, a humid oral environment can accelerate the moisture absorption of acrylic resin and deteriorate its mechanical properties 14) .Therefore, additional research is required that includes an artificial aging process that reproduces the oral environment.Recently, clinical practice has considered it necessary to utilize digital materials and methods when manufacturing dentures.However, most research has been on computer-aided design (CAD)/CAM milling and the mechanical properties of existing denture base resin materials, and research on the physical properties of 3D printing materials is limited 15) .A few studies using 3D printing resin have reported that the physical properties of digital materials are significantly lower than those of milling materials and conventional materials, and hence, there is still insufficient evidence for clinical application.To improve mechanical properties, oligomer-based 3D printing resins have been developed.
Source: Dental Materials Journal
DOI: 10.4012/dmj.2024-080
Authors: Hyeong-Ju YU, You-Jung KANG, Yeseul PARK, Hoon KIM, Jee-Hwan KIM
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4403461157