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Results for “Dental High-Speed Technique”

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At least 19 recordsLinked to original sources
PubMed1977

Dentine/pulp reactions to full crown preparation procedures.

Scanning electron microscopy was used to study the formation of a dentine smear in ten premolars ground with a water-cooled diamond in an air turbine. In another ten teeth the pulp reaction in full crown preparation with the same armamentarium was investigated by histological techniques. The findings revealed the formation of a dentine smear which was easily removed by light polishing with wet pumice, leaving plugs of debris in the tubule apertures. The clinical significance of these findings needs further investigation. No bacteria were demonstrated on the prepared surfaces either in the scanning electron micrographs or histologically when stained with Brown & Brenn stain. Severe, acute pulp reactions were observed subjacent to the dentinal tubules cut in full crown preparation. This technique should therefore be limited to superficial use only.

Bacteria↗
PubMed1979

[The preparation trauma of the pulp and its reactive behavior (author's transl)].

The postpreparative pathophysiological reactions of the blood circulation are shown by vital microscopy examinations of the pulp of the incisors of living rats.--After twenty-four hours from the experimental preparation of cavities, functional changes are characterized by acutely inflammatory reactions. With the passage of time (seven-day check), the damage is compensated for by extensive regeneration (re-formation and new formation of vessels, functional adaptation of the circulation of blood, anastomosing), although irreversible alterations can be seen to remain in the incisors of rats.--A comparison with the results of histological reexaminations of human teeth shows that careful preparation usually avoids lesions being left behind after the fading away of localized acute inflammations.

Adaptation, Physiological↗
PubMed1975

[The prep-trainer--thermal control in the pulp space].

The "Prep-Trainer" was developed as teaching and checking aid in order to enable students and dentists interested in continued education to check themselves. The heat development in the pulp cavity is measured at the model. Measurements made by the author showed that the safest method for maintaining constant temperatures and thus avoiding over-heating of the pulp cavity is the cooling with the air-water spray handpiece by the dental assistant.

Audiovisual Aids↗
PubMed1977

[Microbiological studies on mouth-ringing, cooling and turbine-spray waters].

Microbiological examinations of mouth-cleaning, cooling, and turbine spray waters from various types of dental units showed different degrees of water contamination. The detection of Pseudomonas aeruginosa, because of the classification of this organism as a "problem germ", indicates the necessity for a more critical analysis of water used in stomatology including the elimination of possible sources of contamination.

Bacillus↗
PubMed1979

[Peak-to-valley height measurement and scanning electron microscopy of cavity walls (author's transl)].

Using a feeler type of cutting mechanism and a scanning electron microscope, cavity walls were examined subsequent to the preparation thereof with various types of working tools. The combination of these two methods of examination allows results to be obtained which are far better than those achieved with the use of one of these methods alone. The most unfavourable configuration of the cavity wall is obtained using a turbine (diamond). It is especially in the case of inlay preparations that it is necessary for the walls of cavities prepared using a turbine to be retreated by means of a normal-speed type of instrument. Smoothest surfaces are generally obtained with the use of a finisher.

Dental Caries↗
PubMed1977

[Studies on the spacial aerosol spreading during the use of turbines].

When treating hard tooth structures with a turbine instrument, a polydisperse aerosol is formed from the turbine exhaust air and the cooling-water spray and by the rotation of the abrasive tool. The oral cavity repels this aerosol that is contaminated with micro-organisms and particles of enamel and filling materials. The present paper deals with the spatial propagation of the aerosol cloud in front of the patient's mouth in relation to the site of impact of the turbine instrument. Recommendations are given for practice to reduce the possibilities of infection.

Aerosols↗
PubMed1977

Investigation of variable factors in drilling bone.

Experiments were conducted to investigate the pressures that are exerted on drills during the preparation of bone. Twenty operators used six different types of drills at high and low speeds to prepare standardized holes and slots in animal bone. The peak vertical forces exerted varied between 5.98 and 24.32 newtons (x = 12.45 newtons). The mean vertical forces varied between 4.22 and 18.93 newtons (x = 9.16 newtons). Spear point and twist drills were associated with significantly lower operating pressures and shorter operating times than round and fissure burs. These differences, however, were much less than the interoperator variations.

Animals↗
PubMed1977

[Rational methods of crown preparation].

Today, a rational technique of crown preparation seems to be defined by the following features: 1. Speed-conscious operation 2. Sectionalization into a phase of coarse preparation and a phase of fine preparation 3. Phase-synchronous and segment-oriented coarse preparation in the maximum speed range 4. Fine preparation by means of abrasive tools to achieve a defined preparation limit in the high-speed range 5. Finishing with the aid of properly formed diamond stones or tungsten-carbide finishers in the normal speed range 6. Speed-dependent supply of cooling water according to the principle of double safety (spray and additional cooling).

Crowns↗
PubMed1978

Numerical and experimental evaluation of energy inputs, temperature gradients, and thermal stresses during restorative procedures.

Wet cutting in enamel should be used during restorative procedures. According to evidence reported here, dry cutting can induce sufficiently high thermal stresses to fracture the enamel. Temperatures resulting from dry cutting in dentin are high enough to cause biologic pulp damage if the cutting is within 1 to 2 mm of the pulp. Cracks induced in the cavity walls by dry cutting may eventually contribute to marginal failure. A hand-held syringe directing a small, high-velocity stream of water into the cutting region is a more effective cooling technique than an air-water spray.

Adult↗