ABSTRACT
Dentistry as a profession is suffering in the economic depression, yet this is not reflected in academic journals, with an increase in titles, articles and the advertising of new products and training courses suggesting otherwise. Work for dentists is thinning and patients are less willing to accept the costs of treatment plans. Is it business as usual or is UK dentistry in denial?
Subject(s)
Dentistry/organization & administration , Economics, Dental/trends , United KingdomSubject(s)
Dental Care/standards , Esthetics, Dental , Humans , Quality of Health Care , Societies, Dental , United KingdomABSTRACT
OBJECTIVE: The effect of salivary contamination of enamel and dentin on bonding efficacy of an experimental one-bottle resin adhesive was investigated. METHOD AND MATERIALS: The adhesive was a light-curing urethane dimethacrylate/hydroxyethyl methacrylate/4-methacryloxyethyl trimellitate anhydride mixture dissolved in acetone. Evaluation parameters were shear bond strength and marginal gap width in a dental cavity. Apart from a control group without contamination (group 1), etched enamel and dentin were (2) contaminated with saliva and air dried; (3) contaminated, rinsed, and blot dried; (4) coated with adhesive, contaminated, rinsed, and blot dried; (5) coated with adhesive, light cured, contaminated, rinsed, and air dried; or (6) treated as in group 5, with additional adhesive application after air drying. RESULTS: There was no negative effect in groups 3 and 4, compared with control. Air drying after salivary contamination (group 2) resulted in low shear bond strengths and wide marginal gaps. Contamination of the cured adhesive layer (groups 5 and 6) had no adverse effect on enamel shear bond strengths, but resulted in 50% reduced dentin shear bond strengths and wide marginal gaps. CONCLUSION: The one-bottle adhesive system is relatively insensitive to salivary contamination, provided that the contamination occurs prior to light curing of the adhesive and is carefully rinsed and blot dried. Salivary contact after adhesive curing must be avoided.
Subject(s)
Dental Bonding/methods , Dentin-Bonding Agents , Resin Cements , Saliva , Adhesives/chemistry , Analysis of Variance , Composite Resins , Dental Enamel , Dental Marginal Adaptation , Dentin , Humans , Methacrylates , Polyurethanes , Statistics, Nonparametric , Time Factors , Tricarboxylic AcidsSubject(s)
Dental Bonding/methods , Dental Porcelain/chemistry , Dental Veneers , Acid Etching, Dental , Adhesiveness , Dental Debonding , Dental Enamel/drug effects , Dental Enamel/ultrastructure , Dentin/drug effects , Dentin/ultrastructure , Humans , Materials Testing , Microscopy, Electron, Scanning , Resin Cements/therapeutic use , Tensile Strength , Time FactorsABSTRACT
PTFE is widely used in industry and commercial products, but is not widely used in dentistry. This paper describes some clinical applications of thin non-rigid unsintered PTFE tape which is inert, sterilizable by heat, non-stick, an effective barrier to moisture and chemicals, and is opaque.
Subject(s)
Dental Restoration, Permanent/methods , Polytetrafluoroethylene , Crowns , HumansABSTRACT
The use of endosseous implants as intra-oral anchorage to facilitate orthodontic treatment has been reported in the literature for some years, first in rabbits and dogs, and then in adult human patients. The implants were generally used solely for the purpose of anchorage. This paper reports the successful application of orthodontic forces utilizing dental implants to achieve tooth movement. The implants were subsequently used as fixtures in a pre-determined plan to support a fixed prosthesis. A clinical example demonstrates how implants may serve dual roles, for anchorage and then for fixed prosthetic support. The principles involved in using dental implants as part of a multi-disciplinary approach to dental treatment are illustrated.
Subject(s)
Dental Abutments , Dental Implants , Orthodontic Appliance Design , Orthodontics, Corrective/methods , Adult , Dental Implantation, Endosseous/methods , Denture, Partial, Fixed , Humans , Jaw, Edentulous, Partially/rehabilitation , Male , Malocclusion/therapy , Mandible , Orthodontics, Corrective/instrumentation , StentsSubject(s)
Dental Caries/etiology , Dentin/pathology , Child , Fluorides, Topical/administration & dosage , HumansABSTRACT
A method measuring plaque by area has been developed which can be used to evaluate the antiplaque effect of agents such as dentifrices when used in combination with toothbrushing. The extent of disclosed plaque 24 hours after treatment on tooth surfaces previously cleaned of all observable plaque was drawn by the examiner onto accurate enlarged scale drawings of the outline of the labial surfaces of all incisors, canines, premolars and 1st molars. Areas were then measured by an electronically recording planimeter. Three separate blind crossover trials were performed using this plaque area measurement in which a minimum of 15 subjects brushed normally on one occasion only, with either a calcium carbonate dentifrice or water. Compared with when subjects brushed with water, a statistically significant reduction of 45%-52% in plaque was observed in subjects 24 hours after brushing with the dentifrice in each of the three trials. In a study with 27 subjects, the periodontal condition of the papillae was found to be related to plaque present on labial surfaces on adjacent teeth as measured by this method. The teeth adjacent to papillae which bled on probing had 77% greater plaque area than teeth adjacent to papillae which did not bleed. Plaque area measured by this method on a continuous scale has a sensitivity advantage over the commonly used four-point plaque indices, especially when comparing effective antiplaque treatments or combination of treatments.
