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Biomedical subjects

R S Roda

Publications and source records attributed to R S Roda.

7 recordsLinked to original sources
PubMed1995

Intermediate cementum. Development, structure, composition, and potential functions.

In the roots and root analogs of mammalian teeth a narrow zone of highly calcified tissue occupies the junction between cementum and dentin. This zone is referred to as "intermediate cementum," despite evidence that it is not a product of cementogenesis (or of dentinogenesis). Studies conducted on teeth of human and nonhuman primates indicate that the intermediate cementum layer contains enamel matrix proteins and is likely a product of Hertwig's epithelial root sheath. The available evidence regarding the development (origin), structure, and composition of intermediate cementum is reviewed, and the potential functions of this layer are assessed to include a possible role in wound healing.

Animals↗
PubMed1995

Reliability of reduced air pressure methods used to assess the apical seal.

The reliability of two commonly used methods of sealability testing, dye leakage under normal atmospheric pressure and dye leakage in a partial vacuum, was tested using a repeated studies design. Forty extracted teeth were instrumented and obturated using lateral condensation of gutta-percha and Sealapex sealer. One-half of the teeth were placed in India ink under normal atmospheric pressure and the other half underwent air evacuation before immersion in the ink. After 24 h the teeth were removed from the ink and rendered transparent for linear leakage analysis. A second study, repeated within the exact parameters of the first, was performed approximately 1 month later. Mann-Whitney U tests indicated that there was no significant difference (P>0.05) between the air and vacuum groups or within each group (air or vacuum) between trials, indicating that the methodology is repeatable and that application of reduced air pressure did not enhance reliability. A large majority of the teeth placed under partial vacuum showed evidence of vacuum-induced artefacts that may negate the value of vacuum as a research tool.

Air Pressure↗
PubMed1995

The anatomy of local anesthesia.

The trigeminal nerve is the great sensory nerve of the facial portion of the head, and an intimate knowledge of this nerve and its surrounding structures is a prerequisite to the application of structures is a prerequisite to the application of profound local anesthesia without complication. In this review article, the classic description of the relevant anatomy is presented and updated with recently published research into anatomic variations that have an impact on the induction of clinical local anesthesia. Causes of both failure and complications of traditional local anesthetic techniques are explained, and recommendations for avoiding these pitfalls are made.

Anesthesia, Dental↗
PubMed1994

The anatomy of local anesthesia.

The trigeminal nerve is the great sensory nerve of the facial portion of the head, and an intimate knowledge of this nerve and its surrounding structures is a prerequisite to the application of profound local anesthesia without complication. In this review article, the classic description of the relevant anatomy is described and is updated with recently published research into anatomic variations that have an impact on the induction of clinical local anesthesia. Causes of both failure and complications of traditional local anesthetic techniques are explained, and recommendations for avoiding these pitfalls are made.

Anesthesia, Dental↗
PubMed1992

Naproxen: pharmacology and dental therapeutics.

Naproxen and naproxen sodium are very commonly used and effective non-steroidal anti-inflammatory analgesics. In this paper, they are described and compared, and their pharmacokinetics and indications are discussed. Adverse reactions to these drugs and the mechanism of action of these effects on the gastrointestinal tract, central nervous system, kidneys, liver, and blood are described. A discussion of the effects of the drugs on the elderly and during pregnancy and lactation is included. Also, the allergenicity, miscellaneous rare complications and acute toxicity of the naproxen anion are described, followed by a description of the more common drug interactions. The results of several recent studies that may call into question the current recommendations on using these pharmaceuticals are cited. Until this controversy can be resolved, the practitioner should rely on the principle of "first do no harm" in choosing a course of drug treatment.

Drug Interactions↗
PubMed1992

The combined composite resin and amalgam restoration for posterior teeth: a clinical report.

This paper presents a technique for restoring maxillary posterior teeth with a combined composite resin and amalgam restoration when the preparation extends buccally into an esthetically critical area. This technique has two major advantages over traditional combined restorations: it requires only one clinical appointment, and it provides an esthetically acceptable result while maintaining the advantages of an amalgam restoration. A clinical assessment of 12 of these restorations, in vivo for 0.8 to 6.4 years, is presented. All but one restoration received a score of excellent or acceptable.

Bicuspid↗