Forrest R. Scandrett

Treatment needs of overdenture patients in a longitudinal study: Five-year results

This study evaluated the treatment needs of 44 overdenture patients who had worn their dentures for at least 5 years. There were 135 abutment teeth involved, 35 in the maxillae and 100 in the mandible. Recall rates varied from a low of 27.6% to a high of 73.7%. The attrition rate was 20.5% after 5 years. The caries rate varied from a low of 2.7% to a high of 20.6%, and periodontal treatment was required by 94% of the subjects after 5 years. Only 39.4% of the subjects required adjustments, repairs, relines, or remakes of their overdentures during this time. The study showed that the success of overdentures depended on maintaining oral hygiene at an adequate level and at least yearly recalls to maintain gingival health.

Magnetic retention for overdentures.

The use of implanted and opposing magnets has been reviewed. A technique for the use of implanted magnets in the roots of endodontically treated teeth to aid the retention of overdentures has been described.

A clinical evaluation of techniques to determine the combined width of the maxillary anterior teeth and the maxillary central incisor

Abstract In this study, techniques to determine the combined width of the maxillary anterior teeth and the maxillary central incisor widths were evaluated. Measurements were obtained from the dental casts of 45 men and 45 women and related to their intercommissural width, interalar width, bizygomatic width, sagittal cranial diameter, interbuccal frenum distance, philtrum width, and age. Correlation coefficients were calculated for all relationships.

A comparison of electrolytic and chemical etch systems on the resin-to-metal tensile bond strength

This investigation compared the tensile bond strengths of a nickel-chromium-beryllium alloy etched electrolytically and etched with a commercially available chemical gel. The number of applications and the thermal conditions of the chemical etchant were varied to assess their influence on the composite-to-metal tensile bond strength. Etched metal cylinders were bonded end-to-end with a resin luting agent and were subsequently tested for tensile strength. Etch patterns, mean bond strengths, and mode of failure were recorded. Significant differences relating to the application number and the thermal conditions of the chemically etched specimens were noted.

Effect on dimensional accuracy when reattaching fractured lone standing teeth of a cast

1. Ninety-five percent of the variation in position of reattached lone standing incisor and premolar stone teeth was within the limits of physiologic tooth movement. 2. No significant differences resulted from the use of Class I or Class II stones, the technical experience of the operator, or the diameter of the neck of the tooth. 3. There were significant differences between Duco cement and Eastman 910 used between the tooth fragments, but none between Duco cement used between the tooth fragments and Eastman 910 used on the fracture line. However, with all three techniques, most of the changes were within the physiologic limits of healthy tooth movement.

Layered silicone rubber technique for flasking removable partial dentures

A method for flasking removable partial dentures using a layered silicone rubber technique has been described. The silicone investment protects the stone teeth from fracture during removal of the removable partial denture from the investment. Then the occlusal changes can be accurately corrected following processing.

Technique for attaching the master cast to its split mounting index

A technique that allows the master cast to be easily removed and attached to its split mounting index has been described. The cast is attached to its split mounting index by means of a machine screw and a disposable mounting stud.