Volume 35, Issue 250 (11-2025)
J Mazandaran Univ Med Sci 2025, 35(250): 239-243 |
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Ramezani A, Zarenejad N, Tavahodi N, Hajinezhad M, Hossein Nattaj A, Salehi M. Evaluation of Dimensional Stability of Duralay Acrylic in Dry and Wet Conditions Over Time. J Mazandaran Univ Med Sci 2025; 35 (250) :239-243
URL: http://jmums.mazums.ac.ir/article-1-21933-en.html
URL: http://jmums.mazums.ac.ir/article-1-21933-en.html
Atefeh Ramezani 
, Nafiseh Zarenejad , Narges Tavahodi , Mehrasa Hajinezhad , Abolfazl Hossein Nattaj , Maedeh Salehi
, Nafiseh Zarenejad , Narges Tavahodi , Mehrasa Hajinezhad , Abolfazl Hossein Nattaj , Maedeh Salehi
Abstract: (85 Views)
Background and purpose: Dimensional changes during polymerization represent a major challenge for dentists when working with acrylic resins. Such changes can compromise the accuracy and overall quality of fabricated prostheses. This study aimed to assess the dimensional stability of two acrylic resin types (GC and DTV) under dry and wet conditions at various time intervals.
Materials and methods: In this in vitro study, 40 specimens of self-polymerizing Duralay acrylic resin from two manufacturers (GC and DTV) were evaluated. Following polymerization and pattern setting, the dimensions and weight of the samples were measured at three time points: immediately (0 hours), 1 hour, and 24 hours. Measurements were performed using a digital caliper with 0.01 mm precision and a digital balance. Statistical analyses were conducted using ANOVA, t-test, and the Friedman test for non-normally distributed data.
Results: The findings indicated that under both dry and wet conditions, there were no significant differences in mean dimensional measurements between the GC and DTV brands at any of the three time points. Neither environment, brand, nor time had a significant effect on the mean dimensional stability of the samples. However, both environment and time significantly influenced the mean weight of the samples (P < 0.001), whereas the brand (GC vs. DTV) did not significantly affect weight changes.
Conclusion: The variables of environment, acrylic resin type, and time did not have a significant impact on the dimensional stability of the samples. However, both environment and time significantly affected weight changes. Therefore, storing the samples in a moist environment is recommended to better maintain weight stability.
Materials and methods: In this in vitro study, 40 specimens of self-polymerizing Duralay acrylic resin from two manufacturers (GC and DTV) were evaluated. Following polymerization and pattern setting, the dimensions and weight of the samples were measured at three time points: immediately (0 hours), 1 hour, and 24 hours. Measurements were performed using a digital caliper with 0.01 mm precision and a digital balance. Statistical analyses were conducted using ANOVA, t-test, and the Friedman test for non-normally distributed data.
Results: The findings indicated that under both dry and wet conditions, there were no significant differences in mean dimensional measurements between the GC and DTV brands at any of the three time points. Neither environment, brand, nor time had a significant effect on the mean dimensional stability of the samples. However, both environment and time significantly influenced the mean weight of the samples (P < 0.001), whereas the brand (GC vs. DTV) did not significantly affect weight changes.
Conclusion: The variables of environment, acrylic resin type, and time did not have a significant impact on the dimensional stability of the samples. However, both environment and time significantly affected weight changes. Therefore, storing the samples in a moist environment is recommended to better maintain weight stability.
Type of Study: Brief Report |
Subject:
Dentistry
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