ABSTRACT
With the advent of stronger adhesive materials and preparations that increase retention and lateral stability, acid-etched retainers provide an alternative approach to fixed bridges. Preparations for acid-etched retainers are more conservative, but may be more difficult to accomplish. Factors that must be considered to ensure successful cases include proper case selection, attention to preparation techniques, impression techniques, moisture control and cementation techniques.
Subject(s)
Acid Etching, Dental/methods , Bicuspid , Crowns , Dental Abutments , Denture, Partial, Fixed, Resin-Bonded , Molar , Aged , Female , Humans , Maxilla , Tooth Loss/therapyABSTRACT
A three-year clinical study is being conducted at the University of Tennessee, Memphis, college of Dentistry, comparing occlusal wear of Class I amalgam restorations with preventive resin restorations. This paper will concentrate on the two-year results of the preventive resin restoration with regards to placement technique, wear as evaluated by the USPHS system, marginal adaptation, recurrent caries, marginal discoloration, and address problems encountered.
Subject(s)
Composite Resins/therapeutic use , Dental Restoration, Permanent/methods , Adolescent , Adult , Child , Dental Caries/therapy , Dental Marginal Adaptation , Dental Restoration, Permanent/adverse effects , Follow-Up Studies , Humans , Recurrence , Time Factors , Tooth Discoloration/etiologyABSTRACT
Ketac Fil glass ionomer cement (GIC) and Scotchbond 2 dentinal bonding agent (DBA)/Silux Plus composite resin restorations were inserted in cervical cavity preparations of extracted human teeth. After thermocycling, the specimens were invested and sectioned longitudinally and horizontally through the center of the restoration. Microleakage was evaluated as a ratio of the extent of methylene blue dye penetration at the tooth-restoration interface. Although all restorations exhibited leakage, both the GIC and bonded composite resin restorations recorded less leakage in retentive than in nonretentive cavity preparations. Composite resin restorations in nonretentive cavity preparations showed significantly more dye penetration toward the pulpal chamber than the GIC restorations. Ketac Fil GIC restorations inserted without a matrix strip exhibited less leakage than those with a matrix strip. The most desirable results were recorded with Scotchbond 2 DBA/Silux Plus composite resin restorations in retentive preparations.
