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At least 217 records · Page 12Linked to original sources
PubMed1976

A review of concepts of silver amalgam retention.

Retention grooves and undercuts are not advantageous to an amalgam cavity preparation. These mechanical locks do not prevent fracture of the proximal portion in vivo, do not inhibit marginal fracture, are not necessary for retention, and are a factor in the split-tooth syndrome. The tensile stress needed to dislodge the restorations would be impossible to achieve in the oral environment, and therefore, additional retention is not worth the added risk of endangering the integrity of the tooth and the pulp. All factors considered, a properly prepared, conservative Class II Black's type of cavity preparation not only remains the easiest to prepare with conventional instrumentation but also is totally adequate to withstand the stresses of mastication, magnifying the desirable properties of the amalgam restoration.

Dental Amalgam↗
PubMed1977

Biologic laws governing functions of muscles that move the mandible. Part IV. Degree of jaw separation and potential for maximum jaw separation.

Accurate diagnosis and treatment of the gnathostomatic system require an understanding of both its biomechanics and its physiology. Clinically, the treatment consists of modifying the existing occlusal program to relieve stress from distressed tissues. The objective of treatment is to effect a neuromuscular release of the mandible. This may be accomplished by (1) equilibration of the natural occlusion, (2) orthodontics, (3) restorative procedures, or (4) surgery. Most frequently, however, the treatment entails some combination of these procedures. The criteria for success of treatment are not determined by the method or technique employed but by the neuromuscular response that the treatment produces. The purpose of this article is not to suggest which occlusal scheme produces the most favorable muscle response in the gnathostomatic tissues. Neither is an objective of this article to teach the mandible-manipulation techniques that are needed to identify occlusal irritants, perform occlusal equilibrations, or obtain accurate centric relation recores. The objective of this article is to emphasize that there are definite principles by which the muscles respond to occlusal contacts. Occlusal contacts can excite bruxism and the sequelae to bruxism. Knowledge of the laws which govern functions of the muscles that move the mandible enables the dentist to acquire the mandibular-manipulation skills that are necessary for the effective diagnosis and treatment of occlusal conditions.

Biology↗
PubMed1980

Occlusion for successful class IV acid-etch restorations.

Properly placed acid-etch Class IV restorations may be dislodged due to occlusal interferences. When restoring an anterior tooth, the dentist should check the three regions of possible incisal prematurities: centric incisal contact, protrusive incisal contact, and midprotrusive incisal contact. By correcting potential problems in these regions before tooth restoration, the dentist helps to ensure longer lasting retention for the restoration.

Acid Etching, Dental↗
PubMed1980

Effects of surface treatments on the retention of restorative materials to dentin.

The effect of various pretreatments on shear bond strengths between dentin and three restorative materials was investigated. Pretreatments included use of cleansing agents and adhesion promoters in combination. Results indicated that: (1) phosphoric acid (50%) and EDTA (10%) were not effective in improving bonding between restorative materials and dentin; (2) NPG-GMA significantly increased resin-dentin adhesion with Cervident and Simulate resin. Silane adhesion promoter in combination with Fuji provided the greatest resistance to shear forces; and (3) Fuji Type II restorative material demonstrated more resistance to shear forces than Cervident and Simulate resins.

Acid Etching, Dental↗
PubMed1981

Potential for tooth fracture in restorative dentistry.

Increasing awareness of tooth fracture, both complete and incomplete, as a significant disease entity has led to improved diagnostic techniques. By using compact, easily handled, fiber optic instruments for transillumination and by developing a "predisposition index" to assist in the evaluation of fracture potential, new dimensions have been added in treatment planning, especially for older patients. Prevention of tooth fracture can best be accomplished by utilizing conservative, nontraumatic tooth preparation procedures, understanding predisposing factors, and using full occlusal coverage, circumferentially retained restorations whenever castings are indicated. Effective management of incomplete tooth fracture involves early recognition of the problem, appropriate and timely treatment, and a realistic assessment of the prognosis.

Dental Pulp↗
PubMed1981

In vitro analysis of self-shearing retentive pins.

Combining stress, analysis, microscopic examination, mechanical testing of the shear mechanism, and retention of the Reten Pin leads to the following conclusions: 1. The suggested 0.006 inch pin-channel mismatch induces high lateral and apical stresses. Microscopically, this was seen to correlate with injury to the dentin. 2. The degree of retention was increased by using a smaller pin-channel mismatch. This correlates with smaller stresses and reduced dentinal damage. 3. The shear mechanism acts in a uniform manner, with a relatively small variation from the mean. It is suggested that for the best results the manufacturer should supply larger twist drills and pins with a somewhat deeper self-shearing groove to minimize apical involvement during shearing of the handle from the pin.

Dental Pins↗