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<p>This study evaluated the shear bond strength (SBS), flexural strength, and color stability of three denture base resins (DBRs)—heat-polymerized (HEA), cold-polymerized (COL), and 3D-printed (TDP)—before and after thermocycling. SBS was evaluated after bonding COL to each DBR. Flexural strength was measured via three-point bending, and color stability with a colorimeter. Half of the specimens underwent 10,000 thermocycles to simulate aging. TDP (9.91&#xa0;MPa) showed significantly lower SBS than HEA (14.85&#xa0;MPa) and COL (15.76&#xa0;MPa) before thermocycling (<i>p</i> &lt; 0.001), but was comparable to HEA (6.89 vs. 7.17 MPa; <i>p</i> &gt; 0.999) afterward. SBS decreased significantly in all groups post-thermocycling (<i>p</i> &lt; 0.01). Thermocycling did not affect the flexural strength of HEA (<i>p</i> = 0.841) or COL (<i>p</i> = 0.434), but significantly reduced TDP’s flexural strength (87.55 to 79.79 MPa; <i>p</i> = 0.002), which nevertheless remained significantly higher than those of HEA and COL (<i>p</i> &lt; 0.001). TDP exhibited the highest color change (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41598_2025_24596_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="44" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:\varDelta\:{E}_{00}\:\)</EquationSource> </InlineEquation>= 3.23), significantly greater than HEA (0.83; <i>p</i> &lt; 0.001) and COL (1.94; <i>p</i> = 0.002), exceeding the perceptibility threshold. While 3D-printed DBRs exhibited comparable SBS and flexural strength to heat-polymerized DBRs after thermocycling, their esthetic durability remains limited under simulated aging.</p>

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Mechanical and esthetic properties of denture base resins in relation to thermocycling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Ha Eun Choi,
  • Sumin Kim,
  • Gi Youn Kim,
  • Jiayi Li,
  • Stefano Pieralli,
  • Kyung Chul Oh

摘要

This study evaluated the shear bond strength (SBS), flexural strength, and color stability of three denture base resins (DBRs)—heat-polymerized (HEA), cold-polymerized (COL), and 3D-printed (TDP)—before and after thermocycling. SBS was evaluated after bonding COL to each DBR. Flexural strength was measured via three-point bending, and color stability with a colorimeter. Half of the specimens underwent 10,000 thermocycles to simulate aging. TDP (9.91 MPa) showed significantly lower SBS than HEA (14.85 MPa) and COL (15.76 MPa) before thermocycling (p < 0.001), but was comparable to HEA (6.89 vs. 7.17 MPa; p > 0.999) afterward. SBS decreased significantly in all groups post-thermocycling (p < 0.01). Thermocycling did not affect the flexural strength of HEA (p = 0.841) or COL (p = 0.434), but significantly reduced TDP’s flexural strength (87.55 to 79.79 MPa; p = 0.002), which nevertheless remained significantly higher than those of HEA and COL (p < 0.001). TDP exhibited the highest color change ( \(\:\varDelta\:{E}_{00}\:\) = 3.23), significantly greater than HEA (0.83; p < 0.001) and COL (1.94; p = 0.002), exceeding the perceptibility threshold. While 3D-printed DBRs exhibited comparable SBS and flexural strength to heat-polymerized DBRs after thermocycling, their esthetic durability remains limited under simulated aging.