TY - JOUR ID - TI - Influence of Closed Sandwich Technique on Marginal Seal of Class II Restorations with Different Substrates using LED Curing AU - Dr. Shatha Abdullah Salih B. D. S., M. Sc., Lecturer. د.شذى عبد الله PY - 2011 VL - 8 IS - 3 SP - 248 EP - 255 JO - MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان SN - 26188500 18138500 AB - This study was done to evaluate the microleakage at the tooth restoration interfacein different substrates when glass ionomer was used as a base which covered by aveneer of resin composite, as closed sandwich technique, with light -emitting diode(LED) curing.Eighty Class II cavities were prepared in mesial and distal of extracted molars,mesial cavities with gingival margins in enamel (E) and distal cavities with gingivalmargins in dentin(D), were divided into four main groups (G)s, each group wassubdivided into GE and GD of ten cavities for each and filled as follows:GI each cavity of GIE & GID was filled with composite and cured with halogenlight curing unit (H), GII each cavity of GIIE & GIID was filled with glass ionomerlining and composite and cured as GI, Group III each cavity of GIIIE & GIIID wasfilled as GI but cured with LED while Group IV, each cavity of GIVE and GIVDfilled as GII and cured as GIII. After restorations, the teeth were thermocycled 300times, soaked in 0.1% methylene blue for 24 hours, sectioned and microleakage fromthe gingival margin scored. Statistical analysis was performed using t-test.There was no significant difference when use sandwich technique in enamel butThere was significant difference in dentin (p≤0.05), while no significant differencewhen the comparison between enamel and dentin, whether LED or H curing was used.With sandwich technique, the marginal adaptation of enamel margins was notdependent on the restorative technique while marginal adaptation in dentin wassignificantly better. The use of LED had no adverse effect on microleakage.

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