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Message: [QUOTE="honestdoc, post: 121862, member: 7943"] With IRM, you have the Eugenol component which decreases dentinal bonding. Because of this, it is important that you touch up the margins like Dr. MattKW mentioned and remove all the IRM. If you have trouble placing the matrix, try pre-wedging the interproximal and allow it to expand. I used to separate & protect the adjacent teeth with a matrix band during preparation but my mean instructor took it away from me. I don't like to do class 3's on molars and premolars due to difficult access. What school do you attend? Hopefully they don't teach you "extension for prevention," and isthmus preparation. I would do a conservative class 2 box prep (if caries are minimal). [/QUOTE]