Evaluation of Shear Bond Strength Between Denture Teeth and 3D‐Printed Denture Base Resin

• Published in: Journal of prosthodontics 2023-04, Vol.32 (S1), p.3-10
• Main Authors: Cleto, Marília P., Silva, Marcela D. D., Nunes, Thaís S. B. S., Viotto, Hamile E. C., Coelho, Sabrina R. G., Pero, Ana C.
• Format: Article
• Language: English
• Subjects: 3D‐printing; acrylic resins; Adhesives; artificial; Bond strength; complete denture; Dental Bonding - methods; Denture Bases; Dentures; Materials Testing; Methylmethacrylate; Polymethyl Methacrylate - chemistry; Polymethylmethacrylate; Printing, Three-Dimensional; Shear Strength; Surface Properties; Teeth; tooth; Tooth, Artificial
• ISSN: 1059-941X; 1532-849X
• DOI: 10.1111/jopr.13527

Purpose The aim of this study was to evaluate the bond strength between two types of artificial teeth with a 3D‐printed denture base resin using different bonding agents. Materials and methods Two types of artificial teeth were evaluated: 3D‐printed (Cosmos TEMP) and prefabricated polymethylmethacrylate (Biotone) bonded to cylinders (2.5 mm in height and 5 mm in diameter) of 3D‐printed denture bases (Cosmos Denture designing by Meshmixer and printed by Flashforge Hunter DLP Resin 3D Printer). Two combinations between denture base and artificial teeth were eveluated: Cosmos Denture – Biotone, n = 30, and Cosmos Denture ‐ Cosmos TEMP, n = 30. For each combination, the specimens were randomly distributed according to the bonding agent: (1) autopolymerized acrylic resin‐Duralay, n = 10; (2) 3D‐printed resin Cosmos TEMP, n = 10; and (3) methylmethacrylate monomer (MMA) + 3D‐printed resin Cosmos TEMP, n = 10, totaling 60 specimens. The application of MMA was done conditioning the tooth surface for 180 seconds; the other agents were applied on the same surface. The virtual design of the 3D‐printed resin teeth was obtained by scanning the first maxillary molar of the prefabricated teeth as the same protocol of cylinders. The control group (n = 10) was a conventional heat‐polymerized denture base resin (Lucitone 550) bonded to the prefabricated resin teeth (Biotone). The shear bond tests were performed by applying a perpendicular force to the artificial tooth – denture base resin, through a chisel at 1 mm/min until failure. Two‐way ANOVA and Bonferroni post hoc tests (α = 0.05) were used for multiple comparisons. Results For the Biotone tooth, the bond strength was significantly higher using MMA + Cosmos TEMP (10.04 MPa), and similar to the control (11.84 MPa, p = 0.484). For the 3D‐printed tooth (Cosmos TEMP), the bond strength using the agents Cosmos TEMP (9.57 MPa) and MMA + Cosmos TEMP (12.72 MPa) were similar to the control (11.84 MPa, p = 0.169 and p = 1, respectively), but different from each other (p = 0.016). Conclusions From the results, it is recommended to use: MMA + Cosmos TEMP bonding agent for the Biotone tooth; and Cosmos TEMP or MMA + Cosmos TEMP bonding agents for the Cosmos TEMP tooth, both attached to the 3D‐printed denture resin Cosmos Denture.