ABSTRACT

Background: Caries is a form of tooth decay that is often encountered in daily life. Caries development can be prevented by dental restoration treatments. One such dental restorative material is a bulk fill composite resin with a low shrinkage level. Disinfection is needed to be done before the application of composite restorative materials. The purpose of this research was to know whether there is an microleakage of bulk fill composite resin after application of cavity disinfectionmaterial such as chlorhexidine digluconate 2% and alcohol 70%.Method: This was an experimental research with post test only control group design. The sample of research were 20 premolar teeth. The samples were divided into two groups (10 teeth each group). Group I was applied chlorhexidine digluconate 2% while group II was applied 70% alcohol. Microleakage were measured by observing a methylene blue 2% penetration depth using a metallography microscope.Result: The result indicated the significant differences microleakage of bulkfill composite resin after application of cavity disinfection chlorhexidine digluconate 2% and alcohol 70% from Mann-whitney test 0,039 (<0,05).Conclusion: Microleakage of the bulk fill composite resin was greater in the 70%alcohol than in the chlorhexidine digluconate 2%.

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ABSTRACT

Background: Inside the oral cavity, restoration always in contact with wet condition, including carbonated drink with low pH level and erosive potential. Sometimes, materials are stored for prolonged time exceeding their expiration date. This research aimed to determine the effect of expiration date (ED) of GIC type II toward its surface deterioration (surface hardness and roughness) when immersed in carbonated drink. Method: This was an experimental laboratory using GIC type II with ED of 2014, 2016 and 2021. Ten cylindrical specimens per group were made (d=10mm, h=2mm). Surface hardness and roughness measurements were done prior and after specimens were immersed for seven days in carbonated drink. Carbonated drinks were changed daily to maintain its pH level. Result: There were reduction in surface roughness and increased in surface roughness after immersed for seven days. The greatest deterioration occurred in group expired in 2014. Based on the Kruskal Wallis test result, there was a significant difference in surface hardness alteration (p=0.000) and surface roughness alteration (p=0.000) based on its ED. Conclusion: ED has great impact on surface characteristics (hardness and roughness). Using expired GIC type II deal with great risk of surface deterioration when in contact with low pH level beverages.