Cleaning solutions and liner type: in vitro bond strength on three-dimensional printed denture bases: the effects of cleaning solutions on prosthesis bases

Abstract

Objective: This study aimed to investigate the tensile bond strength of hard and soft reline materials bonded to three-dimensional (3D)-printed denture bases and to evaluate the impact of various cleaning solutions on these properties. Material and method: Specimens of 3D-printed denture bases were relined with either hard- or soft-liner materials. The samples were then treated with five different cleaning agents: sodium hypochlorite, hydrogen peroxide, distilled water, acetic acid, and a commercial chemical denture cleaner. The tensile bond strength at the liner-base interface was measured using a universal tensile testing machine. Data was analyzed using two-way ANOVA (α=0.05). Result: The hard-liner material exhibited significantly superior tensile bond strength compared to the soft-liner. Among the cleaning agents, the chemical denture cleaner exhibited the highest tensile bond strength (24.89 ± 2.68 MPa), while sodium hypochlorite exhibited the lowest value (17.20 ± 1.81 MPa). Conclusion: For 3D-printed denture bases, hard liner materials provide greater tensile bond strength than soft liners. Furthermore, the choice of cleaning agent significantly influences bond integrity; specifically, sodium hypochlorite may adversely affect tensile strength. Selecting an appropriate cleaning protocol is essential to improve the longevity of relined 3D-printed prostheses.