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Biomedical subjects

D A Newitter

Publications and source records attributed to D A Newitter.

15 recordsLinked to original sources
PubMed1989

The dulling of twist drills during pin channel placement.

Dull twist drills used for pin channels have been cited as an etiology for dentinal cracks. This investigation examined the dulling phenomenon after repeatedly using twist drills. Inspection of the twist drills in the SEM for metal deformation revealed no alteration of the cutting edges but an accumulation of a smear debris was noted behind the cutting edges of the cone-shaped drill. Debris was also recorded on the land and flute spiral surfaces with morphological changes on the dentinal walls. These surfaces progressed serially from a rough surface to a smooth, plaque-like surface with fine striations oriented toward the drill rotation. The timing of the changes coincided with dentinal cracking reported by others. Dulling of twist drills in dentin can be attributed to adherence of byproducts rather than a loss of the cutting edge.

Dental Instruments↗
PubMed1986

Predictable diastema reduction with filled resin: diagnostic wax-up.

A method for predictably altering anterior esthetics with composite resins is presented. The diagnostic wax-up is the key element. It is used to make a patient presentation cast and to customize resin forms. The resin forms are used to reproduce the predicted tooth form in the mouth quickly and accurately. The method should alert the dentist to the technical feasibility of the planned treatment and the difficulties that may be encountered. In addition, it should alleviate potential misunderstanding and disappointment of the patient. Finally, diagnostic waxing is time saving and simplifies the chairside procedure.

Composite Resins↗
PubMed1983

An aid for verifying the nature of dental casting alloys.

A geologic field test was modified for determining the presence of gold in dental alloys. This qualitative test gave positive evidence for the presence of gold in most of the alloy samples tested containing 59% or more gold. It is recommended that dentists use this procedure for color comparison of castings to alloy ingot samples of known composition. More definitive professional assaying may be desired for confirmation.

Chemical Phenomena↗
PubMed1981

Efficient production of small models.

Small instructional models, such as replicas of tooth preparations, are used routinely in dental courses to encourage consistent instruction and evaluation. The option is available to fabricate models from molds rather than purchasing models from a manufacturer. Removal of small models from molds can be difficult, tedious, and time consuming. Also, the mold can be damaged by instruments during the removal of a model. A device that injects compressed air into the mold separates small models easily and quickly. The injector device can be assembled from parts available in the general market-place. Safety precautions should be observed.

Dental Equipment↗
PubMed1980

An evaluation of postadjustment polishing techniques for porcelain denture teeth.

Eleven commonly used methods of adjusting and polishing porcelain denture teeth were evaluated. They were compared to the surface of an unaltered denture tooth. Three methods (7, 10, and 11) resulted in surfaces which appeared polished under visual examination. These three methods produced finished surfaces comparable to the unaltered tooth. In attempting to avoid the undesirable sequelae of occlusal wear due to friction, the dentist may choose one of these techniques to complete the adjustment of vacuum-fired porcelain denture teeth prior to placement of the denture. Clinical significance of slight differences in surface roughness must be assessed through carefully controlled patient studies.

Dental Instruments↗
PubMedDate not supplied

Rx for caries prevention: time line for home care. A software aid for communication of patient instructions for management of dental caries.

Treatment of a caries active patient requires the clinician to be knowledgeable in the restorative and risk management issues with which these patients often present. Modifications of risk factors that promote dental caries play an important part in the long-term restorative success in these patients. Patient compliance to recommendations addressing modifiable caries risk factors for maintenance of oral health is important to long-term caries risk management. Effective dentist-patient or hygienist-patient communication is a first step to encouraging a proactive role by the patient. Others have reported verbal communication accompanied by written communication to result in better compliance compared to verbal communication, alone (Tagliacozzo & Ima, 1970; MacDonald, MacDonald & Phoenix, 1977; Baker & others, 1991; Harvey & Plumridge, 1991; Vukmir & others, 1993; Makoul, Arntson & Schofield, 1995). Further evidence shows that medical patients who misunderstand their treatment plans and associated instructions usually exhibit poor compliance to following directions (Cargil, 1992; Counsell, Geddis & Smith, 1993; Vukmir & others, 1993; Makoul & others, 1995; Mayeaux & others, 1996). Computer-generated (printed) instructions were shown to significantly increase compliance to emergency room instructions when compared to verbal or verbal + hand-written instructions (Vukmir & others, 1993). Written instructions for use in management of dental caries have not been widely addressed in the literature (Fuller & Harding, 1991; Benn & others, 1997). This report presents a novel computer-generated, graphic approach to written communication that recognizes the patient's need to be reminded that home care consists of daily cyclic events. The objective of this approach is to promote communication with and comprehension by a wider population range than what might be affected by text-only instructions. The software for this method is pre-loaded with recommendations that can be modified by the dentist or hygienist and can be easily adapted as part of a comprehensive disease management program used in the office.

Communication↗