A comparative study of the effects of QTH and LED light curing units on the surface hardness of colored compomer and Hybrid composites
Journal Title: Caspian Journal of Dental Research - Year 2015, Vol 4, Issue 1
Abstract
Introduction: One factor affecting the degree of polymerization is the type of light-curing device. The aim of this study was to compare the effects of LED and QTH light curing units on the surface hardness of composite and compomer. Materials &Methods: In this experimental study, 30 samples of composite and compomer were divided into 3 groups of 10 each. One-half of the subgroups in each group were cured with LED and the other half with Halogen light curing units (LCUs). 49 points on the surface were marked and then the hardness of these points was measured by using Vickers hardness test. Results: The mean hardness of composites cured by using LED was more than the Halogen group but in compomer it was reversed and this difference was statistically significant (p<0.001). Z 250 composite had the highest level of hardness and the lowest hardness was related to the Heliomolar composite and had significant difference (p<0.001). Conclusion: In the present study, the results indicated that LED light curing unit had great effect on the hardness of composites but in compomer, the QTH showed a better result.
Authors and Affiliations
Effat Khodadadi, Nastaran Shamsi, Soraya Khafri, Homayoun Alaghehmand
Keywords
Related Articles
- EP ID EP179455
- DOI -
- Views 73
- Downloads 0
Comparative evaluation of microleakage of composite restorations using fifth and seventh generations of adhesive systems
Introduction: Simultaneous etching of enamel and dentin using the novel generation of adhesive systems with contracted operational steps, has shown a good clinical efficacy. The aim of this study was to evaluate the micr...
Comparison the effect of casein phosphopeptide amorphous calcium phosphate and fluoride varnish on dentin hypersensitivity reduction
Introduction: Nowadays, several casein components such as casein phosphopeptide amorphous calcium phosphate (CPP-ACP) are vastly considered as a suitable replacement for fluoride component. The aim of this study was to c...
The comparison of papilla preservation technique and semilunar incision with sub- epithelial connective tissue graft in dark triangle treatment
Introduction: Ability to reconstruct the papilla in anterior maxilla is important aspect of perio-plastic surgery. In most articles, connective tissue is used with different designs of incisions. The aim of this study wa...
Antibacterial efficacy of lavandula officinalis extract, sodium hypochlorite and chlorhexidine gluconate solutions as root canal irrigations: A comparative analysis
Introduction: This in vitro study aimed to compare the antimicrobial effect of lavandula -0fficinalis extract, with sodium hypochlorite (NaOCL) and chlorhexidine gluconate (CHX), as root canal irrigants, on Enterococcus...
Measurement of iron, magnesium and chromium concentrations in the saliva of the patients undergoing fixed orthodontic treatment
Introduction: Stainless steel alloy used in orthodontics has elements such as iron - magnesium and chromium, which may be released due to corrosion in the mouth. The aim of this study was to evaluate the changes of these...