Cureus · 2025
Effect of Surface Treatments and Repair Resins on the Flexural Strength of Heat-Polymerized Denture Base Resin: An In Vitro Study.
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Gupta Kimmi, Chuchra Alisha, Bindra Shweta, Arora Reetu, Hingad Nupur, Babbar Amit
Аннотация
OBJECTIVE: Our research compared the flexural strength of heat-polymerized denture base resin after applying different surface treatments and using various repair materials.
METHODOLOGY: A total of 96 rectangular specimens made of heat-polymerized acrylic resin were prepared using a customized metal mold following conventional processing methods. Each specimen measured 65 × 10 × 2.5 mm. The specimens were then sectioned into two halves, creating a 3 × 10 × 2.5 mm repair gap. Three groups were formed (n = 32 each) based on the type of repair material used and subdivided into four subgroups (n = 8 each) according to the surface treatment applied. These subgroups included a control group with no surface treatment, a group treated with 37% phosphoric acid, a group treated with 250 µm alumina particles, and a group treated with an Er: YAG laser. The designated repair material was used to repair the gap following surface treatment. The flexural strength of all specimens was then evaluated using a universal testing machine to evaluate the effects of these treatments and repair resins. The recorded flexural strength values were tabulated and analyzed using statistical methods.
RESULTS: The repair material (group factor) had a significant impact on flexural strength (p < 0.001), with a sum of squares of 166,506.176, a mean square of 83,253.088, and an F-ratio of 24,560.779, demonstrating that the type of resin used for repair influenced the strength of the repaired specimen. The surface treatment (subgroup factor) also had a significant effect (p < 0.001), with a sum of squares of 4,230.983, a mean square of 1,410.328, and an F-ratio of 416.066, confirming that surface treatments improved the flexural strength of the repaired denture base. The interaction between repair material and surface treatment was also significant (p < 0.001), with a sum of squares of 2,357.973, a mean square of 392.996, and an F-ratio of 115.939, suggesting that selecting the appropriate combination of repair material and surface treatment is essential for achieving optimal mechanical strength.
CONCLUSION: This study's findings indicate that acrylic resin denture repairs can be effectively performed using heat-polymerized, auto-polymerized, or light-polymerized acrylic resin. The results also demonstrated that applying surface treatments to the repair interface enhances repair strength, thereby improving the durability and performance of the repaired denture base.
METHODOLOGY: A total of 96 rectangular specimens made of heat-polymerized acrylic resin were prepared using a customized metal mold following conventional processing methods. Each specimen measured 65 × 10 × 2.5 mm. The specimens were then sectioned into two halves, creating a 3 × 10 × 2.5 mm repair gap. Three groups were formed (n = 32 each) based on the type of repair material used and subdivided into four subgroups (n = 8 each) according to the surface treatment applied. These subgroups included a control group with no surface treatment, a group treated with 37% phosphoric acid, a group treated with 250 µm alumina particles, and a group treated with an Er: YAG laser. The designated repair material was used to repair the gap following surface treatment. The flexural strength of all specimens was then evaluated using a universal testing machine to evaluate the effects of these treatments and repair resins. The recorded flexural strength values were tabulated and analyzed using statistical methods.
RESULTS: The repair material (group factor) had a significant impact on flexural strength (p < 0.001), with a sum of squares of 166,506.176, a mean square of 83,253.088, and an F-ratio of 24,560.779, demonstrating that the type of resin used for repair influenced the strength of the repaired specimen. The surface treatment (subgroup factor) also had a significant effect (p < 0.001), with a sum of squares of 4,230.983, a mean square of 1,410.328, and an F-ratio of 416.066, confirming that surface treatments improved the flexural strength of the repaired denture base. The interaction between repair material and surface treatment was also significant (p < 0.001), with a sum of squares of 2,357.973, a mean square of 392.996, and an F-ratio of 115.939, suggesting that selecting the appropriate combination of repair material and surface treatment is essential for achieving optimal mechanical strength.
CONCLUSION: This study's findings indicate that acrylic resin denture repairs can be effectively performed using heat-polymerized, auto-polymerized, or light-polymerized acrylic resin. The results also demonstrated that applying surface treatments to the repair interface enhances repair strength, thereby improving the durability and performance of the repaired denture base.