title: Sealing quality of polycarboxylate cements when compared to amalgam as retrofilling material.
abstract: Four hundred roots were uniformly prepared for retrofilling. One hundred of these were retrofilled with amalgam and served as controls for the study. The polycarboxylate cements--Durelon, PCA, and Poly C--were each used as retro-filling material for 100 roots. After immersion in 2 per cent aqueous methylene blue for 7 days, the roots were sectioned in 1 to 2 mm. increments to determine the depth of dye penetration. The depth of dye penetration was used as a measure of their sealing effectiveness. The groups were compared statistically by means of a t test. All cements were significantly different from amalgam. All cements performed inferiorly to amalgam, an already accepted retrofilling material.
mesh_terms: D000179:Acrylates; D003723:Dental Amalgam; D006801:Humans; D011076:Polycarboxylate Cement; D012184:Retrograde Obturation; D012387:Root Canal Filling Materials; D013194:Staining and Labeling
chemical_list: D000179:Acrylates; D011076:Polycarboxylate Cement; D012387:Root Canal Filling Materials; D003723:Dental Amalgam