ABSTRACT
This clinical study utilized cut dentine surfaces on which the Creation Bond System and Scotchbond were applied after various surface treatments. It was observed under the scanning electron microscope that preparation with a tungsten carbide bur left a smear layer on the dentine. When this surface was pumiced, the smear layer remained and the tubules were plugged with smear debris. Polyacrylic acid and citric acid removed the smear layer from the dentine surface. When the Creation Bond System was applied to the surface treated with polyacrylic acid, hollow depressions were produced. Application of the Creation Bond System to the surface treated with citric acid resulted in some resin tag formation into the dentinal tubules as well as hollow depressions on the resin surface. The presence of these irregularities in the resin indicated fluid from the dentinal tubules prevented contact of the bonding resin with the dentine surface. This degree of contamination was not observed when Scotchbond was applied to a pumiced dentine surface.
Subject(s)
Composite Resins/chemistry , Dental Bonding , Dental Cavity Preparation , Dentin/ultrastructure , Resin Cements , Silicates , Tungsten Compounds , Acid Etching, Dental , Acrylic Resins/chemistry , Bisphenol A-Glycidyl Methacrylate , Citrates/administration & dosage , Citric Acid , Dental Cavity Preparation/instrumentation , Dental Cavity Preparation/methods , Dental Cements/chemistry , Humans , Methacrylates/chemistry , Microscopy, Electron, Scanning , Organophosphorus Compounds/chemistry , Silicic Acid , TungstenABSTRACT
This study used an endodontic model to investigate the effect of glove wearing on tactile sensitivity. Dental students, all of whom had worn gloves throughout their clinical training, used a file to detect resistance at the apical end of an endodontic teaching aid. Wearing gloves produced a statistically significant reduction in tactile sensitivity. As large intra- and inter-subject variations were observed both with and without gloves, the sensitivity change brought about by the wearing of the latter seems unlikely to be of significance in clinical endodontics.
Subject(s)
Gloves, Surgical , Touch , Adult , Female , Humans , Male , Models, Biological , Root Canal TherapyABSTRACT
A woman had pain on swallowing and talking when initially seen. Previous diagnoses of glossopharyngeal, neuralgia and myofascial pain dysfunction syndrome had been made. Appropriate treatment for these conditions failed to produce any improvement. Palpation revealed two tender areas bilaterally, overlying the hamulus. Treatment with an injection of 1 ml of dexamethasone (Decadron) 4 mg/ml into each area of tenderness resulted in a dramatic improvement. An anatomic review disclosed the presence of a bursa on the hamulus to protect the tendon of tensor veli palatini. A diagnosis of bursitis was made because of the dramatic improvement in the patient's condition as the result of corticosteroid therapy. Bursitis should therefore be considered in the differential diagnoses of orofacial neuralgias, temporomandibular joint dysfunction, and myofascial pain dysfunction syndrome.