摘要:

SUMMARYApart from the esthetic characteristics of the Class V restoration, the adhesive marginal integrity requires full attention. Due to the inherent curing contraction of the restoratives, cervical dislodgment of the restoration that causes overhang and leakage is very likely to occur. Application of materials with a certain strain capacity will reduce the problems.

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01029.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SUMMARYSeveral points should be kept in mind regarding the content of this paper. First, laboratory data may not be an accurate predictor of clinical success, particularly with regard to dentin bonding agents. Methods to evaluate bond strength and bond integrity through marginal leakage studies are not conducted on comparable models. Bond strength is measured on a one‐dimensional model, whereas leakage is assessed on a three‐dimensional model. A system may show creditable bond strength values, but may allow leakage. The problem does not necessarily lie in the model, but in the current resin formulations. It has been shown that shrinkage of the resin during polymerization may not disrupt the dentin‐resin bond in a one dimensional physical test model, but may be of significant magnitude to do so in a three‐dimensional one. The latter is similar to that encountered in the clinical situation and may help to explain the lack of clinical success with earlier systems. These systems showed creditable bond strength data, but all exhibited gap formation and leakage when three‐dimensional preparations were evaluated. Insufficient data are available in the area to draw any conclusions regarding the latest generation of bonding agents, which produce greater bond strengths and may resist disruption from polymerization shrinkage.The second point to be made is that laboratory investigations have seldom taken into account the physiologic status of dentin encountered clinically. This tissue together with the pulp are morphologically and physiologically inseparable. Of special interest is the role of dentinal fluid and the hydration state of dentin. Only recently have models been developed to study the influence of dentinal fluid flow on adhesion to dentin. The hydration state of collagen significantly affects its cohesive strength. Such influences may have been underestimated. It may be particularly pertinent with this latest generation of bonding agents since pretreatment opens tubules and would consequently increase fluid flow.The third point relates to the integrity of the dentin‐resin bond and, indeed, the integrity of the hard‐ and soft‐tissue tooth complexes as a whole. Laboratory tests may involve thermal cycling to stress the integrity of a bond, but very seldom has cyclical physical stress been introduced. Class V erosion lesions may provide the ultimate challenge to a bonded restoration for the lesion itself is believed to be the result of tissue degradation through localized stress concentration. More research is needed in this important area. The dental tissues deform microscopically under load, a property important to their survival, for example, cusps flex. It may seem a noble idea to bond a bulk of resin to enamel and dentin in order to strengthen the anatomic unit, but it must be remembered that the physical properties of current restorative materials do not match those of dentin and enamel, which differ even between themselves. There is much research, both laboratory and clinical,

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01030.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1988.tb00480.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01031.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01028.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The author reports on microabrasion for the removal of superficial enamel discoloration using a new enamel microabrasion compound and rotary application. After discussing the concept of enamel microabrasion, he describes the step‐by‐step procedures to follow in performing this techni

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01032.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The conservative approach to treatment of discolored dentition using vital and nonvital bleaching is discussed with emphasis on its indications and the specific techniques used.

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1988.tb00482.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

The clinical evaluation of an etched porcelain veneer system for its efficacy and durability is reported. The study, which covers a period of 18 to 42 months, concludes that, based on the data presented, one can consider the esthetic restoration of anterior and posterior teeth on the facial surfaces with etched porcelain veneers as an excellent alternative where the clinical situation indicates a bonded restoration.

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01033.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

A growing number of clinicians have been using laboratory light‐cured resins as a substitute for porcelain veneers. These new systems offer a number of advantages over porcelain. In addition to possessing the ability of being repaired or modified directly in the oral cavity, they can be used with virtually any alloy. This two‐year study dealt with the clinical evaluation of Dentacolor as a veneering agent on posterior crowns. Forty restorations were inserted into a series of patients and evaluated for the following characteristics: color matching ability, wear or loss of anatomic form, surface texture and microleakage at the veneer‐metal interface. At the end of the two years the average wear was only 22 μm. Furthermore, the wear rate was linear. The surfaces were free from pitting, retained a high luster, and exhibited excellent color matching a

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1989.tb01034.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

A technique for the fabrication of indirect heat‐cured composite resin inlays during a single visit is reported. This technique makes use of relatively inexpensive equipment and offers advantages to both the clinician and the patien

ISSN:1496-4155    

DOI:10.1111/j.1708-8240.1988.tb00483.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY