Study group funding.
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Education, Dental, Continuing↗
Biomedical subjects
D Earp
Publications and source records attributed to D Earp.
Natural and mechanical smoke control systems.
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Building Codes↗
Effectiveness of light-curing units in vocational training practices. A project administered by the Research Committee of the Faculty of General Dental Practitioners (UK).
A project has been organised by the Research Committee of the Faculty of General Dental Practitioners (UK) in conjunction with vocational training advisers in which vocational dental practitioners (VDPs) tested the effectiveness of the light-curing units in their surgeries using Heliotests (Ivoclar-Vivadent) and Z100 Composite (3M). The VDPs also completed a questionnaire giving details of their light-curing units. The mean incremental depth stated as being used by the respondents was 2.6 mm; 43.5% of the participants' light-curing units (n = 63) were found to produce a depth of cure less than this figure. However, no correlation was found between reported post-operative clinical problems and cure depth lower than 2.6 mm. A negative correlation between depth of cure and age of light-curing unit was noted, with older units tending to cure the composite samples to less depth than newer units (p = 0.002). One-fifth of the participating VDPs' practices had some means of checking curing-light effectiveness. Greater awareness of the need to monitor practice light-curing units is therefore required.
Composite Resins↗
Hydrocarbons and aromatic hydrocarbons in groundwater surrounding an earthen waste disposal pit for produced water in the Duncan oil field of New Mexico.
Samples of groundwater and soil were collected from test pits placed 25 m intervals on five axes extending from an earthen waste disposal pit for produced water near the San Juan River of northwest New Mexico. Samples were obtained at depths of 1.2 to 1.5 m and were analyzed using GC and GC/MS techniques for purgable hydrocarbons, including benzenes, and for solvent extractable organic compounds. Water samples from test pits down-gradient from the disposal pit contained purgable and extractable hydrocarbons that were similar to contents of the waste disposal pit. In contrast, water samples obtained from test pits up-gradient from the waste pit were free of detectable organic components. Major purgable components in the waste pit and in surrounding groundwater included saturated/unsaturated hydrocarbons and aromatic/alkylated aromatic hydrocarbons. Samples collected 25 m from the waste pit contained concentrations of all compounds greater than in samples taken at 50 m in distance on the same exis. Total concentration of purgable aromatic hydrocarbons in groundwater from test plots ranged from a high of 200 ppb at 25 m, to a low of 12 ppb at 50 m on an axis through the plume center.
Fuel Oils↗