Citation Information :
Phukela SS, Setya G, Yadav B. Comparison of Adaptation of Acrylic Resin Cured by Injection Molded Technique or Microwave Energy: An In Vitro Study. World J Dent 2020; 11 (1):24-29.
Aims and objective: The drawback of poly-methyl-methacrylate (PMMA) is the absence of adaptation accuracy in acrylic resin affected by polymerization shrinkage and resin flask method. The present study was conducted to compare adaptation of acrylic resin cured by injection moulded technique and microwave energy. Materials and methods: 40 standardized maxillary record bases (2 mm thick) were processed from 40 maxillary master casts. SR-Ivocap High Impact Resin was used for injection moulding technique and microwaveable acrylic resin (Onda-Cryl, Artigos Odontológicos, Clássico Ltd, Sao-Paulo, SP, Brazil) was cured by microwave energy (320 W for 3 minutes + 0 W for 3 minutes + 720 W for 3 minutes). These specimens were divided into two groups. Group I: 20 maxillary record bases were fabricated using injection moulding technique. Group II: 20 maxillary record bases were fabricated using microwave energy (320 W for 3 minutes + 0 W for 3 minutes + 720 W for 3 minutes). The base/cast sets were sliced transversally in the posterior palatal seal zone. The gap between the resin base and casts was evaluated at the right marginal limit, left marginal limit, right ridge crest, left ridge crest and the palatal midline. The adaptation accuracy was examined utilizing a stereomicroscope. Results: There was a significant difference between the microwaveable acrylic resin (Onda-Cryl) cured by microwave energy (320 W for 3 minutes + 0 W for 3 minutes + 720 W for 3 minutes) and the SR-Ivocap high impact resin cured by injection moulding technique. Conclusion: The microwaveable acrylic resin (Onda-Cryl) cured by microwave energy (320 W for 3 minutes + 0 W for 3 minutes + 720 W for 3 minutes) showed fewer adaptation inaccuracies and more accurate denture base than injection moulding techniques. Clinical significance: The microwaveable acrylic resin (Onda-Cryl) cured by microwave energy (320 W for 3 minutes + 0 W for 3 minutes + 720 W for 3 minutes) have more accurate denture bases when differentiated to those polymerized by injection moulding techniques. Therefore microwaveable acrylic resin (Onda-Cryl) cured by microwave energy (320 W for 3 minutes + 0 W for 3 minutes + 720 W for 3 minutes) can be a viable option for fabrication of dentures.
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