ABSTRACT
Silane-coated alloy specimens bonded to composite resin were tested for shear bond strengths and compared with an identical specimen group exposed to gypsum invested heat-processing conditions. The results indicate that the bond of composite resin to silane-coated alloy is not impaired by investing, boil-out, cleaning, packing, and curing during the process of securing artificial teeth to a partial denture framework. In a second part of this study, the alloy specimens were silane-coated and exposed to the gypsum invested heat-processing procedure before the composite resin was bonded to them. In addition, the specimens were exposed to one of three different cleaning agents (ethyl acetate, ethyl alcohol, and soap and water). Results in the second part of the study indicate that ethyl acetate is an effective cleaning agent to use when a silane-coated alloy surface previously exposed to gypsum processing is to be bonded to composite resin.
Subject(s)
Calcium Sulfate/chemistry , Chromium Alloys , Composite Resins , Dental Bonding , Silanes , Acetates , Analysis of Variance , Dental Casting Investment , Denture, Partial, Removable , Ethanol , Hot Temperature , Materials Testing , Soaps , Tensile StrengthABSTRACT
Limited space over abutment teeth may make incorporation of a precision attachment system within an existing overdenture technique sensitive. A special diagnostic index can be made to depict the available space within the prosthesis over the abutment teeth. This index is critical to determine the feasibility of attachment incorporation, as well as the selection and correct positioning of an appropriate attachment system. A method to improve predictability for precision attachment incorporation into an existing overdenture is described.
Subject(s)
Denture Design , Denture Precision Attachment , Denture, Overlay , Dental Abutments , Dental Impression Materials , Denture Bases , Denture Rebasing , Denture, Complete , Polyvinyls , Siloxanes , Surface PropertiesABSTRACT
The shear bond strengths of three commercial laboratory curing composite resin veneers bonded to a nickel-chromium-beryllium alloy treated with the Silicoater system were evaluated. Two light-cured resins and one heat- and pressure-cured resin were evaluated. No statistically significant difference in bond strengths among the three resins was found. Microscopic analysis of the fracture surfaces indicated that all failures were complex and cohesive in nature within the resin and composite. On the basis of the shear bond strengths measured, any of the composite resin veneers tested appear to be clinically acceptable.
Subject(s)
Chromium Alloys/chemistry , Composite Resins/chemistry , Dental Bonding , Methacrylates , Resin Cements , Silanes/chemistry , Acrylic Resins/chemistry , Beryllium/chemistry , Dental Porcelain/chemistry , Dental Stress Analysis , Dental Veneers , Laboratories, Dental , Materials Testing , Microscopy, Electron, Scanning , Polyurethanes/chemistry , Stress, Mechanical , Surface PropertiesABSTRACT
Panavia, a composite resin luting agent containing phosphate monomers, bonds chemically to air-abraded base metal alloys and is particularly suited for cementing resin-bonded retainers. Another adhesive methodology (Silicoater system) incorporates a pyrolytically applied silica layer to metal substrates to promote bonding of a resin adhesive. The object of this study was to compare prosthodontic adhesive systems that incorporated the Silicoater system and/or Panavia. The results showed that the surface treatment that provided significantly higher shear bond strengths was the Silicoater system and a layer of unfilled resin. A second test evaluated use of Panavia as a metal opaquing material beneath laboratory light-curing resins. Results showed that Panavia Opaque material was displaced peripherally during placement of overlying laboratory composite resin veneers. This resulted in an uneven intermediate layer of Panavia.
Subject(s)
Adhesives , Chromium Alloys , Dental Bonding/methods , Phosphates , Resin Cements , Silanes , Beryllium , Bisphenol A-Glycidyl Methacrylate , Composite Resins , Dental Veneers , Materials Testing , Nickel , Surface Properties , Tensile StrengthABSTRACT
The purpose of this article is to illustrate a technique adapting a light-curing composite resin veneer and an opaquing medium with chemical adhesion properties to a partial denture framework in a patient with severely worn dentition. Composite resin veneers with favorable wear properties and esthetics are useful materials for restoring occlusions for overlay removable partial dentures.
Subject(s)
Composite Resins , Dental Materials , Denture, Overlay , Denture, Partial, Removable , Phosphates , Resin Cements , Tooth Abrasion/rehabilitation , Aged , Aged, 80 and over , Dental Bonding , Denture Design , Humans , Male , Vertical DimensionABSTRACT
Seventeen patients treated for acute lymphoblastic leukemia by combination chemotherapy before their reaching 10 years of age were studied for altered dental root development of their premolar teeth. Five of the 17 patients showed subjective radiographic evidence of marked shortening of the premolar dental roots; 13 had thinning of the roots. A quantitative analysis was developed and verified, which disclosed a 63.33% to 84.38% reduction of premolar root length when compared with the mean of the historical controls. With recent significant increases in long-term survival rates of children with malignancies, altered dental development becomes an important factor to follow years after chemotherapy is discontinued. The findings of these chemotherapy-associated dental development changes impacts on the patient's quality of life and also can serve as a research tool to assess permanent effects of chemotherapy on normal tissue growth and development.
