Randall W Ellis

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OBJECTIVE This clinical pilot study was conducted to investigate the effectiveness of argon laser irradiation to reduce demineralization or loss of tooth structure in vivo. SUMMARY BACKGROUND DATA In vitro research previously demonstrated the ability of argon laser irradiation to reduce demineralization or loss of tooth structure. METHODS Using the(More)
PURPOSE The purpose of this in vitro study was to compare caries resistance of sound human enamel following argon laser (AL) irradiation, as well as, combinations of topical fluoride foams and AL irradiation. METHODS AND MATERIALS Thirty extracted human teeth were sectioned into four buccal windows and assigned to one of the following treatment groups:(More)
PURPOSE To evaluate topical acidulated phosphate fluoride (APF) and low fluence argon laser (Ar) treatment effects on in vitro caries formation in primary tooth enamel. METHODS 20 extracted or exfoliated primary teeth with sound buccal and lingual surfaces underwent soft tissue debridement and a fluoride-free prophylaxis. Treatment groups were: (1)(More)
PURPOSE This in-vitro study evaluated shear bond strength and analyzed, via scanning electron microscopy, enamel prepared for pit and fissure sealant placement. Various surface pretreatment methods were conducted prior to short-term (72-hour) and long-term (120-day) analysis. METHOD Six treatment groups of 14 teeth, having 28 bonding surfaces (buccal and(More)
This polarized light (PL) and scanning electron microscopic (SEM) in vitro study investigated the effect of argon laser (AL) and visible light (VL) polymerization on the interfaces between compomer and composite resin restorations and the enamel cavosurfaces. Surface topography by SEM revealed a smooth transition between the restorative materials and(More)
PURPOSE The purpose of this descriptive scanning electron microscopic study was to characterize surface alterations in primary tooth enamel after in vitro argon laser irradiation alone and combined with topical fluoride treatment either before or after argon laser irradiation. METHODS Twenty extracted or exfoliated primary teeth underwent soft tissue(More)
PURPOSE The purpose of this in vitro study was to evaluate the effect of low-fluence argon laser (AL) irradiation and acidulated phosphate fluoride (APF) gel treatment on enamel microhardness. METHODS Twelve mandibular permanent molars were selected for this study. The teeth were sectioned generating 4 flat enamel surfaces per tooth. The flattened enamel(More)
  • R W Ellis
  • British journal of industrial medicine
  • 1966
The biological variation encountered in spot urine samples was assessed by collecting six sets of serial urine specimens from five men. The lead, coproporphyrin, and creatinine contents of each specimen were determined and the specific gravity was measured. It is found that as the mean concentration of the metabolite rises so the variability of the(More)