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Biomedical subjects

D J Rinchuse

Publications and source records attributed to D J Rinchuse.

At least 37 records · Page 2Linked to original sources
PubMed1991

The relationship between static occlusion and functional occlusion in a dental school population.

The relationship between static occlusion and functional occlusion was evaluated in 101 dental and dental hygiene students. The sample was selected from a population of 467 students who were enrolled at one dental school during the 1987-1988 academic year based upon the following criteria: age range 18 to 32 years; caucasian race; no prior orthodontic treatment; at least 28 natural teeth present; no occlusal adjustments; and no large restorations, crowns or bridges. Fifty-two (52) of the subjects possessed "normal" static occlusion, 26 had a Class I malocclusion, 16 were found to have a Class II malocclusion, and 7 had a Class III malocclusion. The majority (i.e., 75%) of the 101 subjects possessed non-working (balancing) functional contacts. Seventy-five (75) of the subjects possessed balanced occlusion, nine had canine-protected occlusion, nine possessed group function occlusion, and eight had mixed canine-protected/group functional occlusion. This study found no statistically significant relationship between static occlusion and functional occlusion, however, there was a trend for balanced occlusion to be more often associated with "normal" (ideal) static occlusion.

Adult↗
PubMed1989

Ambiguities of Angle's classification.

In 1900, Edward H. Angle wrote that all teeth should be considered when classifying cases; in 1907, he emphasized using the maxillary first molars as reference teeth. Arguments are presented to illustrate the confusion in relying solely on Angle's system of classification. The criteria for a discrete versus a continuous variable is discussed.

Humans↗
PubMed1986

Relationship of skeletal pattern and nasal form.

This article investigates the relationship of skeletal facial pattern and soft-tissue nasal form. The case sample comprises 123 white female subjects, aged 11.0 to 20.6 years, with no histories of pathology, trauma, surgical intervention, or orthodontic treatment. Measurements were made from cephalometric radiographs, posteroanterior radiographs, and the physioprint photographs. Skeletal classifications were based on the relationship of the maxilla to the mandible; the three classifications were straight profile, retrusive chin profile, and prognathic profile. Pearson product--moment correlation coefficients were used to test intercorrelations of all quantitative variables (including age) with each other. Correlations were highly significant for age, the three profile measurements, and two of the frontal measurements. Hence, noses and skeletal structures showed, as expected, increases with age. Also, profile measurements were highly significantly correlated; larger noses were larger in all profile dimensions. A stepwise discriminant analysis was used to study nonquantitative categories of nasal shape (straight, convex, and concave). This analysis indicated that more than 86% of patients in the sample of 123 demonstrated a correlation of nasal shapes with specific skeletal groupings. Patients with straight profiles tended to have straight noses; convex profiles accompanied convex nasal shapes; and concave profiles were found with concave nasal shapes. The clinical significance of this research is to emphasize the importance of total facial harmony (especially nasal shape) during orthodontic diagnosis and treatment planning.

Adolescent↗
PubMed1986

The cognitive level demands of a dental school's predoctoral, didactic examinations.

A sample of 563 test items was selected from the entire population of predoctoral, written examinations administered by the University of Pittsburgh School of Dental Medicine during the 1983-1984 academic year. Four independent judges classified the sample test items according to the six major levels of the Taxonomy of Educational Objectives (Cognitive Domain) (1956). From the individual classification responses of the four judges, final overall ratings were determined for 518 of the 563 test items. Based upon the final, overall classification ratings for the 518 test items, it was found that 83.9 percent of the items were classified at the Taxonomy's level 1, Knowledge, and 16.1 percent of the test items were classified at the Taxonomy's level 2, Comprehension. No test items were classified at any of the other four levels of the Taxonomy--that is, Application, Analysis, Synthesis, and Evaluation.

Cognition↗
PubMed1983

An evaluation of functional occlusal interferences in orthodontically treated and untreated subjects.

Centric occlusion-generated functional bite registrations failed to show a difference in the number, location or severity of nonworking (balancing) or protrusive functional occlusion contacts between 49 post-orthodontically treated subjects and 27 non-orthodontically treated subjects with ideal static occlusion. Nonworking (balancing) side functional occlusion contacts were present in 85% of the non-orthodontic subjects and 97% of the post-orthodontic subjects. At least within the parameters of this investigation, the lateral and protrusive occlusions of post-orthodontic subjects and comparable non-orthodontic subjects were equivalent. It is important to note that this is a study of incidence. It does not address the meaning or importance of such contacts.

Dental Occlusion, Centric↗
PubMed1982

An evaluation of eccentric occlusal contacts in orthodontically treated subjects.

An investigation using Citricon base regulations to record the number and type of centric occlusion-initiated eccentric contacts failed to demonstrate a difference between forty-nine treated orthodontic patients and twenty-seven untreated subjects who were judged to have "ideal" static occlusion. Of the treated and untreated subjects, 97 percent and 85 percent, respectively, had nonworking (balancing) side occlusal contacts. This study illustrates that among the orthodontic patients treated at one university the number of eccentric occlusal contacts is similar to that of a sample of untreated subjects.

Dental Occlusion↗
PubMed1981

Clinical pharmacology for the orthodontist.

The practice of orthodontics encompasses all other aspects of dentistry, but at the same time it also is very different. Therefore, the pharmacologic agents that would be practical for orthodontic practice are much more limited than those used in other disciplines of dentistry. This, however, does not imply that a full understanding of pharmacologic drug action, side effects, and contraindications is unnecessary. Some common drugs, such as the antibiotics, anticholinergics, fluoride, antianxiety agents, and drugs for myofacial pain, are reviewed according to their application to orthodontic practice.

Adolescent↗
PubMed1976

Central mediated pressor effect by prostaglandins in the rat.

Extremely small concentrations (1 ng/kg/min) of prostaglandins E1, A1, and A2 elevated arterial blood pressure in the rat when infused into the carotid artery. Similar infusions into the femoral vein failed to demonstrate a pressor response. Higher concentrations of the same prostaglandins infused into the femoral vein resulted in a significant depression of blood pressure.

Animals↗
PubMedDate not supplied

Effects of short-term and long-term administration of procaine hydrochloride and mepivacaine hydrochloride on hexobarbital-induced sleeping times in mice.

Investigations were performed to determine the effects of short-and long-term pretreatment with procaine and mepivacaine on hexobarbital-induced sleeping times in mice. It was found that short-term preadministration with procaine (40 mg/kg) and mepivacine (40 and 60 mg/kg) significantly increased hexobarbital-induced sleeping time, but long-term pretreatment had no effect.

Animals↗