Accelerating plaster set using a controlled slurry water concentration.
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Calcium Sulfate↗
Biomedical subjects
R F Jacob
Publications and source records attributed to R F Jacob.
Whole salivary flow rates following submandibular gland resection.
BACKGROUND: Patients with head and neck neoplasms receive therapeutic neck dissections which may include the submandibular gland unilaterally or bilaterally. The clinical consequences of salivary gland resection could be reduced salivary output, altered cariogenic microflora, and increased incidence of dental caries. METHODS: This investigation evaluated whole salivary flow rates of patients who had received unilateral (n = 29) or bilateral (n = 8) submandibular gland resections and compared them with noncancer control subjects (n = 29). RESULTS: Unstimulated and stimulated (paraffin) flow rates were significantly lower in both resection groups compared with those of the noncancer group, ranging from p < .002 to p < .02. Although flow rates were lower in the bilateral group than in the unilateral group, the differences between these two groups were statistically significant (p < .02) only for stimulated saliva. Xerostomia was reported by one third of the resection subjects. CONCLUSION: In view of the significantly lower flow rates observed in the resection groups (especially for unstimulated saliva), topical fluoride therapy should be considered for those patients whose past caries activity would indicate an increased caries risk associated with partial loss of salivary function.
Adult↗
The effect of steam autoclave sterilization on methyl methacrylate cranial implant materials.
The use of methyl methacrylates for cranial repairs has been well established. Procedures for sterilization of these materials include soaking in benzalkonium chloride, use of ethylene oxide gas, or cobalt 60 irradiation. Although ethylene oxide sterilization is the most common method, gas sterilization and degassing of these prefabricated implants may require almost as much time as fabrication. This study evaluated impact strength and linear dimensional change following steam autoclave sterilization of heat-processed methyl methacrylate. It was compared to an autopolymerizing methyl methacrylate for impact strength. No statistical difference was found in impact strength between nonsterile heat-processed methyl methacrylate and autoclaved heat-processed methyl methacrylate; however, both were significantly stronger than the autopolymerizing material. A statistically significant linear dimensional change of 1.211% between the autoclaved and nonsterile heat-processed methyl methacrylate was found, but was not considered clinically significant.
Analysis of Variance↗
Seal integrity of hollow-bulb obturators.
Five techniques using various materials were evaluated for their ability to produce a watertight seal between obturator and lid. Leakage was determined by an increase in sample weight above that attributed to sorption and by visualization of water inside the clear acrylic resin samples. A watertight seal was obtained for some samples in each of the test groups. Only the two-flask technique sealed with heat-processed acrylic resin produced a watertight seal in all samples. It was determined that pressure up to 30 psi for 1 hour does not rupture a sealed hollow bulb and immersion under pressure is required to detect leakage of a bulb in a short period of time.
Dental Leakage↗