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207 results on '"Bretz, Walter A."'

23. A Long-Term Prospective Study of the Etched-Cast Restoration.

Author

Barrack, Gerald and Bretz, Walter A.

Subjects
PROSTHETICS -- Study & teaching, DENTAL fillings, BIOMEDICAL materials, ARTIFICIAL implants, PROSTHODONTICS, DENTISTRY, PROSTHETICS, OPERATIVE dentistry, DENTAL amalgams
Abstract

The etched-cast restoration was introduced in 1980, and a prospective study was initiated in March 1981 to determine if resin-bonded prostheses would prove to be a long-term alternative to traditional complete and partial coverage restorations. All resin-bonded restorations placed since that time in the author's private prosthodontic practice have been recorded in the study. The success rate of 127 restorations has been 92.9%, with a mean longevity of 5 years and 8 months. [ABSTRACT FROM AUTHOR]

Published
1993

24. Periodontal Disease and Subgingival Microbiota as Contributors for RA Pathogenesis: Modifiable Risk Factors?

Author

Scher, Jose U., Bretz, Walter A., and Abramson, Steven B.

Subjects
Arthritis, Rheumatoid, Risk Factors, Microbiota, Gingiva, Humans, Article, Periodontal Diseases
Abstract

Since the early 1900s, the role of periodontal disease in the pathogenesis of rheumatoid arthritis has been a matter of intense research. The last decade has witnessed many advances supporting a link between periodontitis, the presence of specific bacterial species (i.e. Porphyromonas gingivalis) and their effects in immune response. This review will examine available evidence on the individuals.Epidemiological studies have stressed the commonalities shared by periodontal disease and rheumatoid arthritis. Many groups have focused their attention toward understanding the periodontal microbiota and its alterations in states of health and disease. The presence of circulating antibodies against periodontopathic bacteria and associated inflammatory response has been found in both rheumatoid arthritis (RA) patients and individuals at-risk for disease development. Most recently, the periodontal microbiota of smokers and patients with RA has been elucidated, revealing profound changes in the bacterial communities compared with those of healthy controls. This has led to several small clinical trials of progressive disease treatment as adjuvant for disease-modifying therapy in RA.Smoking and periodontal disease are emerging risk factors for the development of RA. Epidemiological, clinical, and basic research has further strengthened this association, pointing toward changes in the oral microbiota as possible contributors to systemic inflammation and arthritis.

Published
2014

31. Treatment Responses to Tooth Whitening in Twins

Author

Corby, Patricia M. A., primary, Biesbrock, Aaron, additional, Gerlach, Robert, additional, Corby, Andrea L., additional, Moreira, Alexandre, additional, Schork, Nicholas J., additional, and Bretz, Walter A., additional

Published
2014
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33. Evaluation of phenolic compounds in Brazilian propolis from different geographic regions

Author

Marcucci, María Cristina, Ferreres, Federico, Ramalho Custódio, Angela, Ferreira, Marcia M. C., Stefanova Bankova, Vassya, García-Viguera, Cristina, and Bretz, Walter Antonio

Subjects
Phenolic Compounds, Principal Components, High Performane Liquid Chromatography, Chemometrics, Propolis
Abstract

6 pages., Chemometrics has been shown quite efficient to uncover relationships between chemical composition of a sample and its geographical origin. Forty propolis samples originated from the the South and South East of Brazil were analyzed by HPLC and 18 compounds of interest were studied which included: caffeic, p-coumaric and ferulic acids, and some of their derivatives, pinobanksin, a derivative of kaempferol and five phenolic compounds (assigned as 3-prenyl4-hydroxycinnamic acid (PHCA); 2,2-dimethyl-6-carboxyethnyl-2H-1-benzopyran (DCBE); 3,5-diprenyl-4-hydroxycinnamic acid (DHCA); compound E (still unknown) and 6-propenoic-2,2-dimethyl-8-prenyl-2H-1-benzopyran acid (DPB). Principal Component Analysis (PCA) indicated three different groups of propolis samples, having the same typical chromatogram, evaluated by HPLC. Samples from the South East group were rich in derivatives of kaempferol. Samples from the South group I had a high content of DPB compound, but a low concentration of kaempferol derivatives and of DCBEN compound. Samples from the South group II were characterized by a high concentration of DCBEN, DHCA, p-coumaric and DPB compounds. Therefore, the identification of new compounds in Brazilian propolis can give, useful information about the plant sources of a given geographic region.

Published
2000

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