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The term "mdt 85 extra quality crack" does not refer to a singular, established technical document but appears to conflate distinct subjects within civil engineering or medical contexts. The Montana Department of Transportation (MDT) provides guidelines for crack sealing, quality control in construction, and bridge deck analysis. For specific information on asphalt maintenance, you can review the MDT Materials and Procedures for Sealing and Filling Cracks in Asphalt document . Investigation of Concrete Bridge Decks

What or physical material are you working with?