Volume 8, Issue 3 (8-2023)
J Res Dent Maxillofac Sci 2023, 8(3): 171-178 |
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Mehraban Jahromi S, Alidad Naeeni M, Mostafa Pour R, Nahidi R, Kaboudanian Ardestani A. Effect of One- and Two-Step Processing Techniques on Flexural Strength of Denture Base Acrylic Resin in Dry and Wet Conditions. J Res Dent Maxillofac Sci 2023; 8 (3) :171-178
URL: http://jrdms.dentaliau.ac.ir/article-1-472-en.html
URL: http://jrdms.dentaliau.ac.ir/article-1-472-en.html
Sarira Mehraban Jahromi1 
, Mohammad Alidad Naeeni2 , Reza Mostafa Pour3 , Reza Nahidi 4, Ali Kaboudanian Ardestani5
, Mohammad Alidad Naeeni2 , Reza Mostafa Pour3 , Reza Nahidi 4, Ali Kaboudanian Ardestani5
1- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
2- Faculty of Dentistry, Tehran Medical Science, Islamic Azad University, Tehran, Iran
3- Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran , r.naidi@iautmu.ac.ir
5- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Science Islamic Azad University, Tehran, Iran
2- Faculty of Dentistry, Tehran Medical Science, Islamic Azad University, Tehran, Iran
3- Department of Prosthodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran , r.naidi@iautmu.ac.ir
5- Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Science Islamic Azad University, Tehran, Iran
Abstract: (973 Views)
| Background and Aim: This study compared the flexural strength (FS) of heat-cure acrylic resin following one- and two-step processing techniques in dry and wet conditions. Materials and Methods: In this in vitro study, 60 acrylic specimens (3×10×65 mm) were fabricated (ISO20795-1) and flasked using a type III dental stone. The specimens were heated to 70°C for one hour and baked for 30 minutes at 100°C. After cooling and polishing, 30 specimens were randomly selected; of which, 15 were stored in 37°C water, and 15 in dry condition for one month. The remaining 30 were flasked again, baked, and divided into two subgroups for storage in dry and wet conditions. The FS of specimens was measured by a universal testing machine. Data were analyzed by one-way ANOVA and Tukey's post-hoc test (α=0.05). Results: The mean FS was 57.5±4.8 MPa and 61.7±4 MPa for specimens subjected to one-step processing and stored in wet and dry conditions, respectively. These values were 56.6±4 MPa and 64.7±2.9 MPa for specimens subjected to two-step processing and stored in wet and dry conditions, respectively (P<0.05). The difference in FS of specimens stored in dry and wet conditions was significant (P<0.05). Conclusion: The two-step processing technique increased the FS while water storage decreased the FS of acrylic resin. FS of specimens subjected to one-step processing with water storage was slightly higher than that of specimens subjected to two-step processing with water storage. FS experienced a greater reduction following two-step processing in a wet environment compared with one-step processing. |
Type of Study: Original article |
Subject:
Prosthodontics
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