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Biomedical subjects

A C Post

Publications and source records attributed to A C Post.

13 recordsLinked to original sources
PubMed1997

Rechargeability of fluoride releasing pit and fissure sealants and restorative resin composites.

PURPOSE: To evaluate the effect of exposure of 1.23% acidulated phosphate fluoride gel on fluoride release from fluoride releasing pit and fissure sealants and restorative resin composites. MATERIALS AND METHODS: Specimens of four fluoride releasing pit and fissure sealants (Helioseal F, Ultraseal XT, Seal Rite-Low Viscosity and Seal Rite-Regular Viscosity) and two fluoride releasing restorative resin composites (Tetric and Heliomolar Radiopaque) were prepared using a Teflon mold. The specimens were divided into two groups. The experimental group was exposed to 1.23% acidulated phosphate fluoride gel and the control group was exposed to 1.23% acidulated phosphate gel without fluoride. The specimens were stored in deionized water and the fluoride concentration of the solution was measured every 24 hours. On day 7, the discs were exposed to the respective gel for 4 minutes and then rinsed in a continuous stream of deionized water for 30 seconds. The fluoride concentration was then measured for another 7 days. RESULTS: There was a significant increase after the fluoride gel treatment in the amount of fluoride released from all of the materials studied. When the cumulative amount of fluoride released was evaluated, Tetric, Heliomolar radiopaque, Helioseal F, and Ultraseal XT released significantly (P < 0.01) more fluoride than the respective control groups. There was no significant difference between groups from day 8 to day 14 for Seal Rite-Regular Viscosity and Seal Rite-Low Viscosity.

Acidulated Phosphate Fluoride↗
PubMed1995

Odonto-onycho-dermal dysplasia.

Odonto-onycho-dermal dysplasia is an ectodermal dysplasia (ED) described once previously in two families who exhibited atrophic malar patches, sparse hair, conical teeth, dystrophic nails and hyperkeratosis of the palms and soles. We describe a boy who developed a blistering malar rash soon after birth. When examined at 11 months, and then at 27 months of age, he had persistent atrophic malar plaques that reddened with heat. He also showed nail dystrophy, sparse hair, lingual concavity of the incisors, a bifid maxillary incisor, a five-cusped molar, and hyperhidrosis of the palms and soles. In addition he had chronic tearing, photophobia, blepharitis, and a mild keratitis. After reviewing EDs with atrophic or scar-like skin changes, we believe this child most resembles the patients with odonto-onycho-dermal dysplasia, although his eye findings are unique.

Ectodermal Dysplasia↗
PubMed1989

A labially positioned mesiodens: case report.

This case report describes a labially positioned maxillary midline mesiodens in an 8-year-old male. The clinical and radiographic appearance and therapeutic considerations are presented. The purpose of this article is to alert the clinician to the importance of radiographic localization prior to surgical intervention, because in some instances a labial surgical approach is preferred over the traditional palatal technique. In this case a labial surgical approach was utilized which allowed for greater conservation of alveolar bone and improved access during removal of the mesiodens.

Child↗
PubMed1988

Eosinophilic granuloma.

Eosinophilic granuloma is said to be the most benign disorder of the triad commonly known as histiocytosis X. There has been, and still is, confusion about the terminology describing this entity. This article reviews the literature on histiocytosis X, with particular emphasis on eosinophilic granuloma and its oral manifestations. The case of a 22-month-old male child with an eosinophilic granuloma of the right mandible is presented. The diagnostic and treatment methods are reviewed and discussed. During the 4 years that the case has been followed there has been progressive healing of the lesion, but other manifestations of the disease process and of the surgical treatment have become evident. The need for close dental as well as medical follow-up in cases involving the dental structures is stressed.

Cell Nucleus↗
PubMed1988

Effects of appliance size, arch wire diameter, and alloy composition on the in vitro force delivery of the quad-helix appliance.

The quad-helix appliance is a fixed lingual arch wire appliance that produces slow maxillary expansion for the treatment of maxillary constriction or crossbite in the primary and mixed dentitions. Despite considerable success in the clinical treatment of patients, there is little quantitative information about the force delivery of this appliance. The purpose of this investigation was to characterize the in vitro force delivery of the quad-helix appliance. Appliances of four sizes were fabricated from Elgiloy blue and stainless steel wires with diameters of 0.032, 0.036, and 0.038 inch. The force delivery in grams for 8-mm activation was determined from the force-extension characteristics using an Instron mechanical testing machine. The results show that the force delivery of the quad-helix appliance is affected significantly by changes in the appliance size and arch wire diameter, but is independent of alloy type (stainless steel or Elgiloy blue). The quantitative results from this investigation should provide worthwhile information for clinical appliance selection and treatment of patients with varying arch dimensions.

Dental Alloys↗
PubMed1984

The effect of superficial colorant and glaze on the surface texture of vacuum-fired porcelain.

The surface smoothness of dental porcelain after the use of various staining and glazing techniques was examined by scanning electron microscopy. The autogenous glazing technique produced a smooth, slightly pitted surface that has been shown to be biologically acceptable and should be used for restorations where the addition of colorant is unnecessary (Fig. 2). If application of glaze powders is desired, the use of the high temperature-induced glazing technique produces a smooth surface (Fig. 4). The use of colorant as the inducing agent does not produce the same degree of smoothness as do the glaze powders (Fig. 3). For teeth that require minimal shade modification, a thin slurry of glaze followed by the colorant modification should be added too unglazed porcelain and air fired to a high temperature-induced glaze (Fig. 6). For teeth that require major color modifications, colorant fixation at 1,500 degrees F followed by a high temperature induced glaze is warranted. The use of the low temperature (1,500 degrees F)-induced glaze should be restricted to cases where high-temperature firing may be detrimental (Fig. 11).

Color↗
PubMed1984

Gingival tissue response to rotary curettage.

A clinical study to compare gingival response to two methods of tissue retraction was completed on 10 patients who required maxillary anterior fixed prostheses. A modified Boley gauge periodontal probe was used to make the biometric measurements. The gingival crest and clinical sulcus measurements were made on designated facial and palatal tissue reference points prior to the procedure and 14 and 90 days after the procedure. Within the limits of this study, the following conclusions were made: Rotary curettage compared favorably with the lateral displacement method of tissue retraction in the amount of gingival crest recession. Rotary curettage caused an apparent disruption of the apical sulcular and attachment epithelium, with an apical repositioning of the tissues after repair and stabilization. The lack of tactile sensation of the high-speed rotating instrument contributed to this problem. The recorded sulcus depth changes were not regarded as clinically significant. Changes in gingival crest and clinical sulcus measurements were not found on the palatal tissues with either method of tissue management. Thicker palatal tissues responded more favorably to rotary curettage than thinner facial tissues. Rotary curettage was an efficient and predictable technique in management of the gingival sulcus for impression-making procedures for fixed prostheses. Long-term clinical observations with a histologic assessment of the healing response to the rotary curettage procedure would be beneficial in further determination of the efficacy of the technique.

Adult↗
PubMed1980

Correction of anterior cross-bite using segmental osteotomies and a fixed splint.

A brief review of methods used in treating anterior crossbites has been outlined. Another approach was also presented using interdental segmental osteotomies to mobilize individual teeth and fixed splints to stabilize the realigned segments. The advantage of this treatment is the expedience with which final results can be obtained and the relative ease in accomplishing the surgical and prosthodontic procedures.

Adult↗