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Evaluation of hard direct reline resins
The Journal of Prosthetic Dentistry
|April 1, 1987
Summary
Direct reline resins show clinically detectable temperature variations during curing. Perm resin exhibited minimal color change and good bond strength after simulated aging, suggesting its suitability for denture relining.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Prosthetics
Background:
- Autopolymerizing reline resins are crucial for denture repair and fit.
- Understanding their thermal properties and aging resistance is vital for clinical success.
- Existing materials vary in performance, necessitating comparative studies.
Purpose of the Study:
- To evaluate the peak curing temperatures, color stability, and bond strength of direct, autopolymerizing reline resins.
- To compare the performance of different commercially available reline materials.
- To assess the clinical relevance of material properties under simulated intraoral conditions.
Main Methods:
- Tested peak curing temperatures of four hard, direct, autopolymerizing reline resins (Perm, Lang's, KOOLiner, Flexacryl, COE-Rect) against ADA specifications.
- Conducted intraoral polymerization temperature testing.
- Assessed color stability using accelerated aging (24 hours).
- Measured bond tensile strengths to denture base materials (Astron).
Main Results:
- All tested materials met ADA guidelines for peak curing temperatures, with a 10°C range observed between materials.
- Intraoral testing showed lower peak temperatures and earlier peaks than specification testing.
- Significant color changes occurred after 24 hours of aging for Flexacryl, COE-Rect, and Lang's.
- Perm demonstrated minimal color change with aging; KOOLiner showed a moderate pre-aging color shift (delta E = 2.2).
- KOOLiner exhibited lower bond tensile strength to denture bases, though clinical significance is unknown.
- Astron denture base material showed higher bond strengths with all reline products.
Conclusions:
- Direct reline resins exhibit clinically detectable temperature differences during polymerization.
- Perm resin offers superior color stability and acceptable bond strength, making it a promising option.
- Material selection should consider thermal properties, aging resistance, and bond strength for optimal denture relining outcomes.