ABSTRACT
Properly placed acid-etch Class IV restorations may be dislodged due to occlusal interferences. When restoring an anterior tooth, the dentist should check the three regions of possible incisal prematurities: centric incisal contact, protrusive incisal contact, and midprotrusive incisal contact. By correcting potential problems in these regions before tooth restoration, the dentist helps to ensure longer lasting retention for the restoration.
Subject(s)
Acid Etching, Dental , Dental Bonding , Dental Occlusion , Dental Restoration, Permanent , Tooth Fractures/therapy , Composite Resins , Dental Cavity Preparation , Dental Occlusion, Centric , Dental Stress Analysis , Humans , Incisor/injuries , Malocclusion/pathology , Tooth Fractures/pathologyABSTRACT
An in vitro study of microleakage of the margins of Class II restorations of several high-copper-content amalgams found that in general, leakage increased between 24 hours and a month, but decreased below the 24-hour values after six months; there were some differences in leakage among the products at 24 hours, but not aftersix months: the depth of leakage was not correlated with adaptation of the cavosurface margins; and the high-copper-content amalgams were similar to the conventional composition amalgam tested in regard to microleakage.
Subject(s)
Copper , Dental Amalgam , Dental Restoration, Permanent , Dental Bonding , Dental Enamel/ultrastructure , Humans , Surface Properties , Time FactorsABSTRACT
1. The retentive quality of dentin to Sevriton, Restodent, and Nuva-Seal was not enhanced by acid etching in this investigation. 2. Acid etching smooths and cleans the dentinal surface. 3. Acid etching clears tubule orifices slightly. 4. Sevriton was the most adhesive material tested. Nuva-Seal was the least retentive of the three materials studied.
Subject(s)
Acid Etching, Dental , Dental Bonding , Dentin/ultrastructure , Composite Resins , Dental Stress Analysis , Humans , Surface Properties , Time FactorsABSTRACT
Composite resin surfaces that formed against a plastic matrix or that polymerized while exposed to air were excellent substrates for the adhesion of new resin. Samples formed by the addition of composite resin to a cut surface had a tensile strength of one half of the cohesive strength of the resin. Coating the cut surface with a thin layer of unfilled resin enhanced bonding of the second composite resin layer. The use of a thin layer of unfilled catalyst resin as a bonding agent caused the most rapid development of strength and the greatest strength in samples tested after 7 days.
Subject(s)
Composite Resins , Adhesiveness , Dental Bonding , Surface Properties , Tensile StrengthABSTRACT
The acid-etch systems have become a familiar part of the dentist's armamentarium for achieving retention in the treatment of major esthetic problems in anterior teeth. They have another advantage, however, that has not been fully utilized. By combining the acid-etch technique with conventional cavity preparations such as the Class III, the common problems associated with microleakage can be greatly reduced and composite resin restorations can be placed with better esthetic results and greater longevity.
