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-6-Fuji I0751 Adhesive Cements: Evaluation of Marginal Demineralization and MicroshearBond StrengthPoster Presentation11:00 AM–12:15 PM Mar 23, 2017 CC, West HallAuthors:Authors:AlaaTurkistani(Presenter)King AbdulazizUniversityAlirezaSadr, University of Washington School of DentistryMd. SofiqulIslam, Tokyo Medical and Dental UniversityYasushi Shimada, Tokyo Medical and Dental UniversityJunjiTagami, Tokyo Medical and Dental UniversityYasunoriSumi, National Center for Geriatrics and GerontologyAbstract: Abstract: Objectives: To monitor demineralization progress around indirect restorations lutedwith adhesive cements using swept-source optical coherence tomography (SS-OCT), and to compare microshearbond strength (µSBS) of different cements to enamel and dentin.Methods: Resin inlays were lutedto cervical cavities (4×2mm) using four cements; FujI (FI, GC Co.), AdshieldRM (AD, Kuraray Noritake Dental), Vitremer(VT, 3M ESPE) or RelyXUnicem2 (RX, 3M ESPE). After 7-d incubation in artificial saliva and 10,000 thermal cycles, specimens were immersed in acidified gel (pH=4.5, 5wk). OCT imaging was performed after 1wk, 3wk and 5wk immersed in acidified gel (pH=4.5, 5wk). OCT imaging was performed after 1wk, 3wk and 5wk (n=8), and lesion progress at fixed 8 locations at enamel and dentin margins of each specimen was measured on obtained cross-sectional images. Cylinders of cements were bonded to enamel and dentin surfaces and µSBS test was performed. Lesion size was analyzed by repeated-measures ANOVA with Bonferronicorrections. One-way ANOVA with Bonferronipost hoc tests was used to compare µSBS among groups (alpha=0.05).Results: Demineralization period, cement type and their interaction had significant effect on lesion size (p< 0.001) in both substrates. Enamel lesion progress was slower in VT, FI and AD, and significantly different from RX and control (p<0.001). VT dentin lesions were significantly and significantly different from RX and control (p<0.001). VT dentin lesions were significantly different from FI and AD (p<0.05), which in turn were significantly different than RX and control (p<0.001). RX lesion progress was significantly different than control in both substrates (p<0.05). µSBS means of AD and RX were significantly higher than FI and VT (p<0.001). In dentin, the difference between RX and AD was significant (p<0.001).Conclusions: Besides adequate bonding, adhesive cements influence lesion formation and progress around indirect restorations affecting their durability. OCT would be a promising clinical tool for evaluation and monitoring of resin inlay margins.Image(s):Image(s):This abstract is based on research that was funded entirely or partially by an outside source:source:grants-in-aid for scientific research no. 24792019 from the Japan Society for the Promotion of ScienceDisclosure Statement:The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONEI have read the IADR policy on licensing.Signed by AlaaTurkistaniReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec IssA):-6-abstract number 0751, https://iadr2017.zerista.com/event/member/330856, 2017Signed by AlaaTurkistani