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Background <p>This study assessed whether pre-warming a highly filled restorative resin-based composite (RBC) and applying a resin-coating layer enhance the strength of feldspathic ceramic compared with conventional resin cementation.</p> Methods <p>One hundred ceramic discs specimens were etched with 5% hydrofluoric acid, silanated, and randomly allocated to 5 groups (<i>n</i> = 20). Group A was coated with a photo-activated resin cement, while Group B was coated with the RBC material at room temperature. Group C received an uncured adhesive layer prior to RBC-coating at room temperature. Groups D and E were both coated with the RBC material that had been preheated to 70&#xa0;°C; in Group D the material was applied directly to the prepared surfaces, whereas in Group E a thin layer of uncured adhesive was applied first. The bi-axial flexure strengths (BFS) of the coated ceramic discs were determined. Scanning electron microscopy was used to characterise the ceramic-resin-cement/RBC interfaces. Comparisons of BFS group means were made by a one-way analysis of variance (ANOVA) and post-hoc Tukey test at α = 0.05.</p> Results <p>A statistically significant difference in the mean BFS was observed among groups (<i>p</i> &lt; 0.01). RBC-coating under ambient conditions (group B) increased mean BFS by ~ 13% compared to conventional resin cementation (group A) (150 ± 11.1&#xa0;MPa and 133 ± 9.8&#xa0;MPa, respectively). Pre-warming the RBC restorative material to 70&#xa0;°C (group D) resulted in a further ~ 12% BFS increase, resulting in the highest values (168 ± 10.5&#xa0;MPa).</p> Conclusions <p>Preheated restorative RBC-coating significantly improved the feldspathic ceramic BFS over conventional resin cementation, suggesting that this can be an effective method to optimise PLV fracture resistance.</p>

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Effect of preheated resin-based composites and resin coating on the strengthening of a porcelain laminate veneer material

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月19日

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  • Kristýna Hynková,
  • Marina Roscoe,
  • Owen Addison,
  • Adam McCourt,
  • Dan L. Romanyk

摘要

Background

This study assessed whether pre-warming a highly filled restorative resin-based composite (RBC) and applying a resin-coating layer enhance the strength of feldspathic ceramic compared with conventional resin cementation.

Methods

One hundred ceramic discs specimens were etched with 5% hydrofluoric acid, silanated, and randomly allocated to 5 groups (n = 20). Group A was coated with a photo-activated resin cement, while Group B was coated with the RBC material at room temperature. Group C received an uncured adhesive layer prior to RBC-coating at room temperature. Groups D and E were both coated with the RBC material that had been preheated to 70 °C; in Group D the material was applied directly to the prepared surfaces, whereas in Group E a thin layer of uncured adhesive was applied first. The bi-axial flexure strengths (BFS) of the coated ceramic discs were determined. Scanning electron microscopy was used to characterise the ceramic-resin-cement/RBC interfaces. Comparisons of BFS group means were made by a one-way analysis of variance (ANOVA) and post-hoc Tukey test at α = 0.05.

Results

A statistically significant difference in the mean BFS was observed among groups (p < 0.01). RBC-coating under ambient conditions (group B) increased mean BFS by ~ 13% compared to conventional resin cementation (group A) (150 ± 11.1 MPa and 133 ± 9.8 MPa, respectively). Pre-warming the RBC restorative material to 70 °C (group D) resulted in a further ~ 12% BFS increase, resulting in the highest values (168 ± 10.5 MPa).

Conclusions

Preheated restorative RBC-coating significantly improved the feldspathic ceramic BFS over conventional resin cementation, suggesting that this can be an effective method to optimise PLV fracture resistance.