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Year : 2022  |  Volume : 13  |  Issue : 3  |  Page : 99-102

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

1 Department of Conservative Dentistry and Prosthodontics, Universiti Sains Islam, Nilai, Negeri Sembilan, Malaysia
2 Ministry of Health, Putrajaya, Malaysia

Correspondence Address:
DDS Wan Nor Syariza Wan Ali
MClinDent (London), MPros RCS (Edin), Faculty of Dentistry, Universiti Sains Islam Malaysia, Tower B, Bangunan MPAJ, Pandan Indah, 55100 Kuala Lumpur
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/denthyp.denthyp_97_21

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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.

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