ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00990.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Since the bleaching of vital teeth using a tray delivery system with a 10 percent carbamide peroxide first became common knowledge in March, 1989, there has been much discussion, improvement, and questions concerning the process and the various products available. This article presents an overview of its history, the variations in techniques, and questions concerning safety, including the impact on tooth structure, the pulp, soft tissue of the mouth, and systemic ingestion. It divides currently available products according to their composition, into either a carbamide peroxide with and without carbopol, a hydrogen peroxide of varying concentrations, a hydrochloric acid, or other categories. It discusses the various delivery mechanisms and comments on their apparent effectiveness, as well as reflecting the current knowledge base of the profession.

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00991.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Tooth whitening systems are widely used clinically and for home usage. The aim of this study was to determine the effects of two bleaching gels, each containing 10 percent and 15 percent carbamide peroxide, respectively, a ‘bleaching gel’ without carbamide peroxide, and carbamide peroxide alone on the viability of human endothelial cellsin vitroin comparison with culture medium that acted as a negative control. The incubation period used was 30 minutes. A colorimetric viability assay (MTT assay) was employed. The results showed that the gel without carbamide peroxide is not cytotoxic compared to the negative control, while carbamide peroxide on its own and 10 percent and 15 percent carbamide peroxide bleaching gels were cytotoxic, but there were no significant differences (p<0.05) among these latter three test groups. These data indicate that 10 percent and 15 percent carbamide peroxide bleaching gels are cytotoxic and that carbamide peroxide is the component responsible for this cytotoxic effect. This paper also discusses why thisin vitrocytotoxic effect appears not to be significantin v

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00992.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Both the Rembrandt Whitening System and Quik Start offer a conservative treatment of discolored teeth, with no adverse reactions to hard or soft tissues reported. As well, patient satisfaction has been high.

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00993.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

One hundred and sixty‐five Cerinate porcelain veneers were placed by 11 private practice clinicians from diverse locations throughout the USA. The veneers were evaluated over a 3‐year service period using Kodachrome photographs and grading of clinical characteristics by evaluators. The following factors were evaluated: (1) esthetics; (2) margin fit; (3) margin discoloration; (4) breakage; (5) gingival irritation; (6) patient acceptance; and (7) caries. Specific characteristics and their evaluations over three years were: (1) Esthetics started out excellent and remained that way; (2) Margin fit was acceptable at the beginning of the study and was actually perceived to improve, perhaps related to cement at the margins wearing and smoothing; (3) Margin discoloration started very low and became slightly worse; (4) Breakage was present during each of the 3 years, and 13 percent of veneers had some breakage after 3 years. Changes in clinical procedures are suggested in this paper to diminish this problem; (5) Gingival irritation was minimal throughout the study; (6) Patient acceptance was excellent at the beginning of the study and improved; and (7) Dental caries involvement was minimal, with only one veneered tooth showing caries involvement. Over the 3‐year period, the veneers provided excellent service ov

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00994.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

This clinical study was done to compare the effectiveness of microabrasion with Prema Compound versus a high speed 12‐fluted bur with water spray in removing incisor hypomineralized defects. Twenty‐one patients had two incisors with enamel surface defects. It was randomly decided to use Prema Compound on one of the incisors and a 12‐fluted bur on the contralateral incisor. One operator did all the procedures, but the tooth's color changes were rated by three observers who rated color photographs pre‐ and postoperatively, and one of the three rated each patient's teeth in person. The data revealed that there was no significant difference between Prema Compound and the 12‐fluted bur in removing incisor hypomineralized defects. Both microabrasion techniques significantly improved the tooth's color, but the Prema method took over 9 minutes longer. The 12‐fluted bur caused no clinically identifiable marks on the enamel surface. Both techniques were very reliable in removing brown hypomineralized enamel defects, but were far less reliable in removing the white mineralization defects. The 12‐fluted bur appeared to be an easier and equally effective alternative to Prema Compound for mineralization defect

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00995.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

This study investigated the microleakage between a composite resin restorative material and six basing materials. Cavities were prepared in polymerized composite resin samples and “restored” with Cavitec, Life, Ketac‐Bond, BaseLine, Cavalite, and VLC Dycal. The samples were thermocycled and immersed in 0.05 percent crystal violet solution for 2 hours, then embedded in clear casting resin, sectioned and examined with an optical microscope. Our results indicated that Cavalite and VLC Dycal allowed no dye penetration. Cavitec and Life had a moderate degree of dye penetration and Ketac‐Bond and BaseLine had a relatively high degree of pene

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00996.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

A method for fabrication of a fluoride‐releasing retainer is described. The insert releases low levels of fluoride, which should promote remineralization and reduce canes potential. Previous research on the amount of fluoride release is also discusse

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00997.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00998.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1991.tb00999.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY