billing code for resin-based composite restorations - direct resin-based composite restorations - direct Resin-based composite refers to a broad category of materials including but not limited to composites. May include bonded composite, light-cured composite, etc. Tooth preparation, acid etching, adhesives (including resin bonding agents), liners and bases and curing are included as part of the restoration. Glass ionomers, when used as restorations, should be reported with these codes. If pins are used, they should be reported separately (see D2951). ISBN:1935201387#CDT 2011-2012 Current Dental Terminology, Chapter 1 billing code for restorative