ABSTRACT
Three recording media used to relate stone casts for 15 dentate patients were compared for accuracy. Interjaw relationships at the maximum intercuspation position and the retruded contact position were recorded using impression plaster, wax, and Duralay acrylic resin. A Lucia programming jig was used in the retruded contact position. The vertical distance and horizontal deviation between the casts were measured from reference points on the casts using each recording material. The average percentage differences between the recording materials were calculated. Hand articulation was the most accurate method of relating the casts at maximum intercuspation. The most accurate recording medium was impression plaster, followed by dental wax and Duralay resin at the maximum intercuspation and retruded contact positions.
Subject(s)
Acrylic Resins , Calcium Sulfate , Dental Impression Materials , Dental Occlusion , Jaw Relation Record , Methylmethacrylates , Waxes , Acrylic Resins/chemistry , Calcium Sulfate/chemistry , Centric Relation , Dental Impression Materials/chemistry , Humans , Surface Properties , Vertical Dimension , Waxes/chemistryABSTRACT
A simple technique for fabricating stud overdenture retainers in the form of custom attachment castings with teflon retention discs has been described. This system allows for selective placement of the retention sphere on the root surface and control of retention through the size of the retention sphere. Using transfer location projections, exact transfer of the castings to the working model is possible. When necessary, the teflon discs may easily be replaced at the chairside.
Subject(s)
Denture Design , Denture Precision Attachment , Denture, Overlay , Acrylic Resins , Denture Bases , Denture Retention , Denture, Complete , Humans , Polytetrafluoroethylene , Surface PropertiesABSTRACT
Craniographic registrations were used to examine 25 Bedouin skulls. The skulls were divided into three groups according to the anatomy and position of the maxillary incisor. Correlations between condylar guidance angle, maxillary incisal palatal angle, attrition, and flaring were investigated. No correlation was found between the condylar and maxillary incisal palatal angles. In the presence of severe attrition and/or flaring, the maxillary incisal palatal angle was reduced and mild reduction was also found in the condylar guidance angle. A strong correlation was found between the level of attrition and flaring.
Subject(s)
Cephalometry , Dental Occlusion , Maxilla/anatomy & histology , Tooth Abrasion , Humans , Incisor/physiology , Mandibular Condyle/physiologyABSTRACT
Two hundred and forty root canals of extracted single-rooted teeth were prepared to the same dimension, and Dentatus posts of equal size were cemented without screwing them into the dentine. Five cleansing solutions and two dentine adhesive systems were evaluated prior to post-cementation using chemical-cure composite resin. 'Pull-out' tests were then conducted in order to evaluate the bond strength of these intra-pulpal posts. The use of Conclude (composite luting cement) alone, with or without the cleansing solutions, resulted in significantly lower pull-out forces. Scotchbond Dental Adhesive gave significantly better results, regardless of the cleansing solution used. Gluma Dentine Adhesive significantly increased the pull-out forces only when used with its supplied cleanser or Tubulicid.
Subject(s)
Acrylates , Aldehydes , Crowns , Dental Cements , Dentin/drug effects , Denture Retention , Glutaral , Methacrylates , Polymethacrylic Acids , Post and Core Technique , Resin Cements , Root Canal Irrigants/pharmacology , Acrylic Resins , Bisphenol A-Glycidyl Methacrylate , Chlorhexidine , Citrates , Citric Acid , Dental Bonding/methods , Dental Stress Analysis , Dentin/ultrastructure , Dequalinium , Evaluation Studies as Topic , Humans , Phosphoric Acids , Post and Core Technique/instrumentationABSTRACT
A device for subgingival margin preparation is presented. The gingival guard consists of a clamp attached to the high-speed handpiece supporting a stainless steel shank terminating in a sphere. The guard permits nontraumatic subgingival margin preparation.
Subject(s)
Crowns , Dental Cavity Preparation/instrumentation , Gingiva , Protective Devices , Dental High-Speed Equipment , Equipment Design , HumansABSTRACT
An improved impression technique is described using a plastic, transparent, flexible cap in combination with silicone impression materials. The technique can easily be applied at the chairside by the clinician and provides a solution to some of the present problems in impression with minimal trauma to the surrounding tissues.
Subject(s)
Dental Impression Technique/instrumentation , Plastics , Dental Impression Materials , Equipment Design , Humans , Matrix Bands , Silicone ElastomersABSTRACT
A method for retracting gingival tissue to allow recontouring of crown surfaces and removal of overhanging margins has been presented.
Subject(s)
Crowns , Denture Repair , Gingiva/anatomy & histology , HumansSubject(s)
Dental Amalgam , Dental Cavity Preparation/instrumentation , Dental Leakage/etiology , Tungsten Compounds , Carbon , Diamond , Humans , TungstenABSTRACT
Sixty-three No. 4 Dentatus threaded posts were cemented in extracted teeth and tested for tensile strength. The cementing medium was Silar composite alone or in combination with a conventional bonding agent or Scotchbond dental adhesive, or both. Results indicate that: Retention was greater when the posts were cemented with the Silar composite preceded with the application of Scotchbond. Retention was less with Silar composite alone or combined with a conventional bonding agent. Scotchbond is suggested for use as a bonding agent when cementing Dentatus posts with composites.
Subject(s)
Bisphenol A-Glycidyl Methacrylate , Composite Resins , Crowns , Dental Cements , Denture Retention , Post and Core Technique , Resin Cements , Acrylic Resins , Adhesives , Humans , Tensile StrengthSubject(s)
Composite Resins , Crowns , Denture Retention , Post and Core Technique , Dental Cements , HumansABSTRACT
Our study was designed to (1) test clinically the reproducibility of the NPT by comparing two consecutive occlusal records and records made at 1-month intervals (2) test the reproducibility of a color-marking technique under the same conditions, and (3) compare the location of occlusal contacts as registered by these two techniques. Results showed that neither technique is highly reproducible. However, the NPT is more reproducible than the CMT. The advantages and disadvantages of the NPT and the CMT were described. It was suggested that more research should be conducted to improve the accuracy of occlusal record techniques.
Subject(s)
Dental Instruments , Dental Occlusion , Jaw Relation Record , Tooth/anatomy & histology , Dental Articulators , Equipment Design , Humans , Male , Surface Properties , Time FactorsSubject(s)
Copper , Dental Amalgam , Dental Cavity Lining , Dental Leakage/pathology , Silver , Coloring Agents , Dental Cavity Preparation , Dental Leakage/diagnosis , HumansABSTRACT
The latest generation of Scurasil (dimethylpolisoxane) ureteral prosthesis was used in six dogs as a model for internal urinary diversion in patients with metastatic disease. It was found to cause minimal reaction but carried a high complication rate, including stone formation, end-stage pyelonephritis, and hydronephrosis. Although technically easy to use, modifications in design are necessary prior to use in humans.