The International journal of prosthodontics · 2025
Shear Bond Strength of Repair Materials by Different Polymerization Methods on 3D-Printed Denture Bases.
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Oyamada Yutaro, Sawada Tomofumi, Nakanishi Atsuo, Kondo Hisatomo
Аннотация
PURPOSE: To investigate shear bond strengths (SBSs) of denture repair materials using different polymerization methods to a 3D-printed denture base (DLP) compared to an autopolymerized polymethyl methacrylate denture base (PMMA).
MATERIALS AND METHODS: DLP and PMMA disks were fabricated, roughened using #400 silicon carbide abrasive paper, and treated with the primer/bonding of the respective repair material. An autopolymerized denture repair material (PER) or a light-polymerized denture relining material (MRB) was polymerized on the disks. All specimens were stored in distilled water at 37°C for 24 hours. Half of the specimens underwent thermocycling (TC; 5,000 cycles, 5 to 55°C). SBS testing was conducted (n = 20 per group), and the fracture pattern was analyzed. The SBS data were analyzed using nonparametric Kruskal- Wallis tests and Weibull distributions with the maximum likelihood estimation.
RESULTS: MRB specimens showed significantly higher SBS and Weibull characteristic strength values than PER specimens (P < .001), irrespective of the denture base material. No statistical differences were observed in Weibull modulus among the specimens, except PMMA-MRB specimens, which showed the highest values (P < .001). Thermal aging tended to decrease these values; however, no significant differences were observed between the non-TC and TC groups. Adhesive failure was dominantly observed in the specimens, except DLP-MRB specimens, which shifted to cohesive failures within the denture base.
CONCLUSIONS: The repairability of the DLP specimens was comparable to those of the PMMA specimens. Thus, denture repair of the DLP denture base could be treated in the same manner as a conventional PMMA denture base.
MATERIALS AND METHODS: DLP and PMMA disks were fabricated, roughened using #400 silicon carbide abrasive paper, and treated with the primer/bonding of the respective repair material. An autopolymerized denture repair material (PER) or a light-polymerized denture relining material (MRB) was polymerized on the disks. All specimens were stored in distilled water at 37°C for 24 hours. Half of the specimens underwent thermocycling (TC; 5,000 cycles, 5 to 55°C). SBS testing was conducted (n = 20 per group), and the fracture pattern was analyzed. The SBS data were analyzed using nonparametric Kruskal- Wallis tests and Weibull distributions with the maximum likelihood estimation.
RESULTS: MRB specimens showed significantly higher SBS and Weibull characteristic strength values than PER specimens (P < .001), irrespective of the denture base material. No statistical differences were observed in Weibull modulus among the specimens, except PMMA-MRB specimens, which showed the highest values (P < .001). Thermal aging tended to decrease these values; however, no significant differences were observed between the non-TC and TC groups. Adhesive failure was dominantly observed in the specimens, except DLP-MRB specimens, which shifted to cohesive failures within the denture base.
CONCLUSIONS: The repairability of the DLP specimens was comparable to those of the PMMA specimens. Thus, denture repair of the DLP denture base could be treated in the same manner as a conventional PMMA denture base.