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Biomedical subjects

L M Jameson

Publications and source records attributed to L M Jameson.

16 recordsLinked to original sources
PubMed1997

Overcoming social and cultural barriers to care for patients with diabetes.

We attempted to develop a culturally sensitive alternative approach to diabetes management in a multiethnic, socially disadvantaged community (Waianae, Hawaii). The aims of this 3.5-year demonstration project were to establish regular community-based medical contact with diabetic patients who had a history of nonadherence to treatment regimens and to determine whether this strategy would lead to better health care (particularly improved self-management) in these patients. This community-based, culturally sensitive outreach system of medical follow up dramatically improved the amount and quality of medical care provided to this high-risk subpopulation of patients with diabetes.

Adolescent↗
PubMed1995

Achieving positive predictive prosthodontic treatment outcomes.

Dental disease patterns have changed resulting in a population of patients seeking comprehensive prosthodontic care while presenting with a complexity of limitations. Predicting prosthodontic treatment outcomes can be facilitated by identification and accommodation of these limitations. A five step problem solving format is presented to assist in developing individualised treatment plans designed to maximise positive outcomes. Emphasis is placed on the significance of informed consent and patient compliance. Applications of the principles discussed are illustrated by reviewing three potential prosthodontic treatment options for a partial endentulous patient. Long-term predictive prosthodontic success depends on accurate planning, quality care, patient compliance and professional monitoring.

Dental Implants↗
PubMed1994

Investigation of stiffness and microstructure of joints soldered with gas-oxygen torch and infrared methods.

The stiffness of soldered connectors fabricated with the gas-oxygen torch technique was compared with those fabricated with the infrared technique. Untreated solder materials were used as controls. Untreated solder materials of gold-palladium, palladium-silver, and chromium-cobalt alloys exhibited significantly higher stiffness than the soldered specimens fabricated with either method. There was no significant difference between the gas-oxygen torch and the infrared groups of the gold-palladium and palladium-silver alloys. Photomicrographs revealed that the soldered specimens displayed porosities. For the chromium-cobalt alloy, the infrared group demonstrated significantly higher stiffness than the gas-oxygen torch group. Photomicrographs also disclosed that the chromium-cobalt alloy soldered with the gas-oxygen torch technique had a significant heat-affected zone.

Analysis of Variance↗
PubMed1993

Mechanical properties of metal connectors soldered by gas torch versus an infrared technique.

PURPOSE: The ultimate tensile strength and percentage elongation of solder joints of three alloy systems were tested. MATERIALS AND METHODS: Solder joints were formed using either an infrared soldering machine or gas-oxygen torch. Intact solder materials were used as controls. RESULTS: There were no significant differences in percentage elongation among different treatment methods of the solders or among various solder materials. All intact solder materials possessed significantly higher ultimate tensile strength than the joints made with either method. For high-noble and noble alloy solders, there were no significant differences in ultimate tensile strength of joints made with either method. For base metal alloy solder, the ultimate tensile strength of joints made with the infrared technique was significantly higher than that made with the gas-oxygen torch technique. CONCLUSIONS: The infrared technique can be used as an alternative to the gas-torch technique for soldering high-noble and noble alloys. It is superior to the gas-torch technique for soldering a cobalt-chromium alloy.

Analysis of Variance↗
PubMed1993

Dental implant care: should it be a specialty?

There is a growing demand and need for dental implants, but treatment is reaching only a selected patient population. There is no indication that the profession is unable to meet current needs. The profession must make this care available to more patients, direct preventive measures to susceptible edentate populations and address the issue of entitlement to primary care.

American Dental Association↗
PubMed1991

Adhesive properties of several impression material systems: Part II.

The effect of saliva contamination on the tensile adhesive bond strengths of four impression adhesive systems, (1) polysulfide, (2) polyether, (3) polyvinylsiloxane, and (4) condensation silicone impression adhesive, was studied. Standard acrylic resin tray samples of 1-inch square surface were made. Tray surfaces were contaminated with saliva either before or after the application of tray adhesives. Tensile tests were performed with a Universal Load testing machine. The tensile adhesive bond strengths of contaminated tray surface and contaminated adhesive were compared with a group of control. Contamination of all impression adhesives resulted in significantly lower bond strength. Except for the polyvinylsiloxane and polysulfide impression adhesive systems, saliva contamination of tray material significantly decreased adhesive bond strengths. Impression trays should be tried in the mouth, rinsed, and dried before adhesive is applied.

Adhesiveness↗
PubMed1991

The effect of oxidation heat treatment of porcelain bond strength in selected base metal alloys.

Base metal alloys have been widely used for fixed partial dentures in the past decade. The oxidation heat treatment (degassing) of these alloys is a controversial step to prepare the metal surface for bonding porcelain. This study evaluated the effect of oxidation heat treatment on the porcelain bond strength of base metal alloys and investigated composition changes that may have occurred during this process.

Analysis of Variance↗
PubMed1991

Adhesive properties of several impression material systems: Part I.

The tensile adhesive bond strength of five impression adhesive systems was studied: polysulfide, polyether, polyvinylsiloxane, condensation silicone impression, and polyvinylsiloxane putty adhesive systems. Results showed no significant difference in adhesive bond strength to autopolymerizing acrylic resin between the former four impression materials studied. Polyether and medium-viscosity polyvinylsiloxane demonstrated significantly higher adhesive bond strength to polystyrene than either polysulfide or condensation silicone. The medium-viscosity polyvinylsiloxane impression material showed significantly higher adhesive bond strength to polystyrene than autopolymerizing acrylic resin whereas polysulfide and condensation silicone impression materials adhered significantly better to autopolymerizing acrylic resin than polystyrene. The polyvinylsiloxane putty did not adhere to its impression adhesive. Variation of the speed of tensile testing between 5 to 20 inches per minutes did not affect the adhesive bond strength of a polysulfide impression material.

Adhesiveness↗
PubMed1982

Crown contours and gingival response.

The following periodontal/restorative interrelations should be observed: 1. Deflective contours and/or overcontouring should be avoided in the cervical third and the interproximal surfaces of tooth restorations. 2. Overcontouring of the interproximal region is common and harmful to periodontal health. 3. Adequate tooth reduction at the gingival margin and interproximally provides for restorative materials and lessens the potential for overcontouring in these critical regions. 4. Fluting or barreling of exposed furcations eliminates plaque shelves and promotes accessibility for hygiene. 5. Minimal disruption within the intracrevicular space during tooth preparation allows a more predictable, favorable periodontal response to satisfactorily contoured restorations.

Crowns↗
PubMedDate not supplied

A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns.

The in vitro marginal fit of three all-ceramic crown systems (In-Ceram, Procera, and IPS Empress) was compared. All crown systems were significantly different from each other at P = 0.05. In-Ceram exhibited the greatest marginal discrepancy (161 microns), followed by Procera (83 microns), and IPS Empress (63 microns). There were no significant differences among the various stages of the crown fabrication: core fabrication, porcelain veneering, and glazing. The facial and lingual margins exhibited significantly larger marginal discrepancies than the mesial and distal margins.

Aluminum Oxide↗