Color Stability of Expired Restorative Dental Composite Resins
Journal Title: IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) - Year 2017, Vol 16, Issue 3
Abstract
Although expired dental composites should not be used in practice, limited information on their properties is available. The purpose of this study was to evaluate their color stability. 3 composite resins (ice/SDI, rok/SDI, spectrum/Dentsply) from 15 to 146 months after their expiration date and the same materials 23 to 45 months before their expiration date were used to make round specimens. All specimens were finished and polished and after their initial storage in water of 37oC for 48h, they were immersed in coffee baths simulating 30,60,90,180,360 days of coffee’s staining effect. A mean of three measurements of color parameters in the CIELAB system were taken with a portable colorimeter (ShadeEye/Shiofu) at all periods, and data were analyzed statistically by 2way repeated measures ANOVA at a=0.05. Color difference values (ΔΕ*) between base line and staining periods for the investigated materials were 17.7 to 47.6 for the new materials and 13.3 to 38.2 for the expired materials. Statistical analysis indicated significant differences between staining periods (p<0.05) with all materials, but no significant differences between expired and unexpired materials (p>0.05). Although investigated materials had expired for long, their staining behavior within coffee was similar to unexpired. Differences found among materials and immersion time.
Authors and Affiliations
Spyropoulou Nikolina, Plevritaki Anastasia, Masouras Konstantinos, Lagouvardos Panagiotis
Keywords
Related Articles
- EP ID EP600176
- DOI 10.9790/0853-1603098085.
- Views 90
- Downloads 0
Correlation of Hematological Parameters and NESTROFT in A Routine Hematology Laboratory – A Prospective Study
Thalassemia syndromes are considered to be the most common genetic disorders worldwide. Hence, prenatal diagnosis using genotyping techniques are designed for the early diagnosis and management. The costs of these prenat...
Dental caries experience in preschool children of Thiruvananthapuram, Kerala: Is it related to the sociodemographic factors?
Background: Early childhood caries (ECC) is a multi-factorial childhood disease with biological, socio-cultural-economic and behavioural determinants. In children, past caries experience (caries prevalence) is the strong...
Post Appendectomy Syndrome
Summary: On the basis of my experience of more than twenty years surgical practice, I have found that a large number of patients suffer from persisting right lower abdominal pain after appendectomy. This perplexing situa...
The Risk Behaviour of People Living With Hiv/Aids
Background: As HIV is the world´s infectious killer and the Guntur District belongs to Andhra Pradesh, India was categorized as “A” basing on the high antenatal HIV prevalence for the last two years as studied by NACO (N...
Analysis of Delayed Dislocation of IoL: Cause And Effect
Aim: To analyse risk factors associated with delayed dislocation of IOLs. Methods: Hospital based prospective intervention study during 1997-2012.All cases of IOLs dislocated after 6 months were included. Investigations...