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Conversion and Tack-Curing of Light-Cured Veneer Luting Agents
Aikaterini Petropoulou1, Maria Dimitriadi2, Spiros Zinelis2
1Department of Fixed Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, 2 Thivon Str., 11527 Athens, Greece.
Journal of Functional Biomaterials
|September 26, 2025
Summary
Light-cured veneer luting agents show reduced curing under ceramic veneers. Using touch-cure activators can improve curing, but instructed tack-curing leads to difficult excess removal.
Area of Science:
- Dental materials science
- Biomaterials engineering
- Restorative dentistry
Background:
- Light-cured luting agents are crucial for veneer restorations.
- Light attenuation through ceramic veneers and challenges in excess removal pose clinical issues.
Purpose of the Study:
- To assess the curing capacity of five light-cured veneer luting agents (VLAs) under lithium disilicate veneers.
- To evaluate the effect of touch-cure primers and two tack-curing modes (contact and distant) on VLA setting.
Main Methods:
- Utilized Attenuated Total Reflectance Fourier-Transform Infrared (ATR-FTIR) spectroscopy to measure degree of conversion (DC%).
- Employed Vickers hardness (VHN) tests to assess material hardness.
- Tested five VLAs (CH2, GCV, PNV, PMS, VEV) with and without primers under ceramic simulation.
Main Results:
- All VLAs showed significantly lower DC% under ceramic compared to controls, with VEV and CH2 performing best.
- Primers improved DC% by 4-13% in veneer groups.
- Contact tack-curing yielded 37-78% conversion and 31-57% hardness relative to controls, indicating a vitreous state.
- Distant tack-curing resulted in minimal conversion (0-7% of controls) and untraceable indentations.
Conclusions:
- Low translucency lithium disilicate veneers significantly reduce VLA curing efficiency.
- Touch-cure activators can enhance VLA conversion under veneers.
- Current tack-curing protocols result in vitrified materials, complicating excess removal and highlighting the need for standardization.
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