How Many Microwave Disinfection Cycles is Safe for the Adaptability of Polymethyl Methacrylate (PMMA) Denture Base Materials?: An In Vitro Study

• Main Authors: Wan Nor Syariza Wan Ali (Author), Noor Farishahbanubinti Ahmad (Author), Sharifah Nor Aishah Syed Yussof (Author)
• Format: Book
• Published: Wolters Kluwer Medknow Publications, 2022-01-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 2155-8213; 10.4103/denthyp.denthyp_97_21
• Keywords: acrylic denture base; denture adaptability; microwave disinfection; polymethyl methacrylate; Dentistry; RK1-715
• Source: Dental Hypotheses, Vol 13, Iss 3, Pp 99-102 (2022)

Introduction: We aimed to determine the maximum microwave disinfection cycles that is safe for the adaptability of polymethyl methacrylate (PMMA) denture bases under power-time setting of 630 W for 3 minutes. Materials and Methods: Thirty PMMA maxillary denture bases were constructed and divided into two groups, control (no disinfection) and test (microwave disinfection at 630W for 3 minutes in water immersion). Coltene Rapid Liner (Coltene/Whaledent AG, Altstatten, Switzerland) silicone was coated onto the internal surface of the samples followed by placement of 8 kgf of axial load. The silicone film was removed, and weighed using analytical balance. One day interval was given between each cycle and samples were stored in 37°C water bath. Tests were carried out until a statistically significant silicone film weight change detected. The data were analyzed on SPSS version 21.0 (IBM Corp, Armonk, NY). Results: Statistically significant change of the denture base was detected after the tenth cycle of microwave irradiation. Conclusion: The maximum microwave disinfection cycles that is safe for the adaptability of PMMA denture bases under power-time setting of 630 W for 3 minutes is only up to 10 cycles.