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Dimensional Stability of Light-Activated Urethane Dimethacrylate Denture Base Resins
Swati Mishra1, Saurabh Chaturvedi2, Mariyam Ali1
1Department of Prosthodontics, Career Postgraduate Institute of Dental Sciences, Lucknow 226008, India.
Polymers
|February 11, 2023
Summary
A multi-step fabrication technique using three curing cycles significantly improves the dimensional stability and adaptation of light-activated urethane dimethacrylate (UDMA) visible light cure (VLC) denture bases compared to conventional methods.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Accurate and dimensionally stable trial denture bases are crucial for successful denture fabrication.
- Visible light cure (VLC) denture bases made from urethane dimethacrylate (UDMA) are commonly used.
- Fabrication techniques and curing cycles can influence the dimensional stability of VLC denture bases.
Purpose of the Study:
- To evaluate the dimensional stability of UDMA VLC denture bases fabricated using three different techniques and curing cycles.
- To compare the adaptation of denture bases produced by conventional, modified, and multi-step fabrication methods.
- To determine the optimal curing protocol for enhanced dimensional accuracy in VLC denture bases.
Main Methods:
- Forty-five UDMA VLC denture base samples were fabricated and divided into three groups (n=15 per group).
- Group A: Conventional technique (5-min cure). Group B: Modified technique (two 4-min cures). Group C: Multi-step technique (4-min, 4-min, 2-min cures).
- Dimensional discrepancies between the denture base samples and master casts were measured at specific sites (mid-palate, right/left ridge crest) using a stereomicroscope after 24 hours.
Main Results:
- The multi-step fabrication technique (Group C) demonstrated significantly lower mean dimensional discrepancies at all measured sites compared to the conventional (Group A) and modified (Group B) techniques.
- Mean discrepancies at 24h: Mid-palate (A: 0.790mm, B: 0.741mm, C: 0.379mm); Right ridge crest (A: 0.567mm, B: 0.408mm, C: 0.185mm); Left ridge crest (A: 0.475mm, B: 0.331mm, C: 0.125mm).
- Statistical analysis confirmed significant differences in dimensional discrepancies among the groups (p < 0.001 for all sites).
Conclusions:
- The multi-step fabrication technique with three curing cycles significantly enhances the dimensional accuracy and adaptation of UDMA VLC denture bases.
- Clinicians should consider adopting multi-step fabrication techniques to improve denture base adaptation and overall denture stability.
- Optimizing curing protocols is essential for achieving superior dimensional stability in light-activated denture base materials.
