George E. Myers

Nature of Contacts in Centric Occlusion in 32 Adults

An evaluation of the location and nature of occlusal contacts in centric occlusion of 32 adults revealed teeth that had no occlusal contact, no opposing tooth, contact on flat surfaces, contact on one or more inclined planes, and contacts on a combination of flat and inclined planes.

Effects of occlusal therapy on pantographic reproducibility of mandibular border movements

A clinical experiment was undertaken to study the relationship between occlusal therapy and pantographic reproducibility. Twenty-six subjects were categorized according to their ability to reproduce pantographic border movements and were put into either a control nonreproducible, control reproducible, or experimental nonreproducible group. From each subject a sequence of five pantographic surveys consisting of two morning and two afternoon pantographic recordings was taken. Each survey period lasted a minimum of 30 days. The experimental subjects alone were given occlusal splint therapy and occlusal adjustment therapy during the sequence of recall periods. The relationship between the effect caused by occlusal therapy and pantographic reproducibility was analyzed. For the purpose of analysis, the pantographic recordings were assessed a numerical score using a pantographic reproducibility index. A double-blind technique was used until all data were collected.

Graphic recordings of mandibular movements: Research criteria

Abstract Studies using graphic tracing devices have yielded conflicting results concerning mandibular movements. The purpose of this study was to determine whether graphic tracings could be affected by styli positions in relationship to changes in vertical dimension, by the shape of central bearing surfaces and by tooth contacts and functional movements. A pantograph was used on patients to study the effect of these variables. The results of this study indicate that several variables can affect graphic tracing of mandibular movements. The effects of these variables were shown and suggestions were made to reduce the inconsistencies found in studies using graphic tracings. Research criteria were suggested for conducting and reporting the results of studies of mandibular movements.

The Thiokol rubber base impression materials

Abstract Some physical properties of the Thiokol rubber base impression materials have been investigated. The manipulation and setting times of products have been determined at room temperature and 37 ° C. The effect of variations in proportioning of base and catalyst has been determined and a comparative evaluation of the consistency of products conducted. The per cent set and per cent strain characteristics have been determined 10 minutes after the start of mixing. This 10-minute time was chosen because it represents a practical time interval for clinical use. A clinical evaluation has studied the behavior of some of these products in three techniques.

Physical Properties of Some Zinc Oxide-Eugenol Cements

SYNOPSIS IN INTERLINGUA PROPRIETATES PHYSIC DE CERTE CEMENTOS A OXYDO DE ZINC E EUGENOL.—Le hic-reporate studio esseva concernite con le consistentia, le fortia compressive, le tempores de travalio e de prisa, le spissitate de pellicula, e le duressa del materiales studiate. Lor numero esseva 6. Le valores pro le consistentia variava inter 35 e 60 mm. Le fortias compressive variava ab 6,4 ad 219 kg/cm 2. Le tempore de travalio esseva inter 3 e 21 minutas, e le tempore de prisa final esseva inter 5,5 e 20 minutas additional. Omne le cementos produceva un spissitate de pellicula de minus que 0,04 mm. Le valores del duressa post 24 horas variava inter 0,05 e 1,1 mm de penetration.

Clinical Study of Dental Cements. VI. A Study of Zinc Phosphate, EBA-Reinforced Zinc Oxide Eugenol and Polyacrylic Acid Cements as Luting Agents in Fixed Prostheses

Three cements were used to cement single restorations and bridges. Patients were recalled and evaluated for satisfactory retention of the restorations. Results obtained for a zinc phosphate cement, a reinforced zinc oxide eugenol cement and a polyacrylic acid cement are presented.

Clinical Studies of Dental Cements: V. Recall Evaluation of Restorations Cemented with a Zinc Oxide-Eugenol Cement and a Zinc Phosphate Cement

Patients with restorations cemented with a reinforced zinc oxide-eugenol cement and a zinc phosphate cement were recalled after a four- to seven-year interval. No significant differences in clinical success were observed between restorations luted with the two cements. No significant difference in the incidence of caries at the restoration margins was noted between the cements.

Clinical Studies of Dental Cements: III. Seven Zinc Oxide-Eugenol Cements Used for Temporarily Cementing Completed Restorations

Seven zinc oxide-eugenol cements with compressive strengths from 200 psi to 8,000 psi were used for temporarily cementing completed inlays, crowns, and bridges. The effectiveness of each cement in a variety of clinical situations is presented. Cement of 1,000 psi met the requirements of typical clinical cases most frequently. The cements of compressive strength 200, 400, 600, 2,200, and 3,500 psi were required in other clinical cases with sufficient frequency to justify their use.

Electroformed die technique for rubber base impressions

Abstract The principles of plating rubber base impressions with silver are discussed in relation to current strength and time of immersion. A method of producing a silver-plated laboratory cast with removable tooth dies is described.

Clinical Study of Dental Cements. VII. A Study of Bridge Retainers Luted with Three Different Dental Cements

In a clinical study of three luting cements, 547 bridges and 162 crowns were permanently cemented. Patients were recalled at 6-month intervals and the restorations were examined for looseness. A pattern of retainer type, cement type and retainer success was demonstrable.