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ORIGINAL ARTICLE
Year : 2019  |  Volume : 19  |  Issue : 3  |  Page : 248-254

Comparative evaluation of diametral tensile strength of phosphate-bonded investment (ringless) material by using air-drying method, conventional hot air oven, microwave oven, and combination of microwave and conventional oven: An in vitro study


Department of Prosthodontics, V.S.P.M's Dental College and Research Centre, Nagpur, Maharashtra, India

Correspondence Address:
Dr. Akhil Rathi
401, Shubham Enclave Rahate Colony, Nagpur - 440 022, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jips.jips_45_19

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Aim: This study evaluated and compared the diametral tensile strength (DTS) of phosphate-bonded investment (PBI) material (ringless) used in removable cast partial denture fabrication. Settings and Design: Comparative - Invitro study. Materials and Methods: The PBI material, Wirovest used in this study was subjected to four different drying methods. A total of 80 specimens were prepared in a cylindrical form; 20 specimens were air dried for 2 h, 20 specimens were dried in a conventional oven at 230°C for 1 h, 20 specimens were dried in microwave oven at 600 W for 10 min, and remaining 20 specimens were dried first in microwave oven and then in conventional oven. The dried specimens were tested at 2-h interval for diametral compression at a crosshead speed of 0.5 cm/min. Statistical Analysis Used: Pairwise analysis. Results: The microwave drying technique and drying by combination method resulted in greater DTS, respectively. Conclusion: Within the limitation of this study, PBI specimens dried in microwave oven at 600W for 10 min increased the diametral strength and are also a time-saving procedure.


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