Provide definite seating landmarks, allowing proper seating of the veneer.
#Labial veeer lam free#
Provide a finished preparation that is smooth and free of any sharp internal line angles.Maintain the preparation within enamel wherever possible.Provide a definite margin, so that the ceramist has a finishing line, allowing correct emergence of the veneer from the gingival margin.Provide sufficient thickness for the porcelain for adequate fracture resistance and not to over-contour the final restoration.
Meticulous tooth preparation is required with porcelain laminate veneers. 1Those veneers bonded to dentin and teeth with preparation margins in dentin were approximately 10 times more likely to fail than those bonded to enamel. In a 12-year study by Gurel of 583 veneers, 7.2% or 42 veneers failed. This puts the porcelain at risk of fracture when placed under tensile loading. Preparation into dentine should be avoided because of the less reliable bond to dentine and the difference in elastic modulus and flexibility between dentine and porcelain. Failure to do this may result in excessive and unnecessary removal of tooth enamel.Īll efforts should be made to contain the preparation within enamel, as this provides opportunity for a reliable and durable bond between restoration and remaining tooth tissue. It is important that whatever tooth reduction is required, it is based on the definitive wax-up/planned outcome and not the original tooth. The preparation for PLVs should be based on the final smile design, with the shade and position of the margin of the restorations being taken into consideration. There is no reliable evidence to show a benefit of one type of veneer restoration (direct or indirect) over the other with regard to the longevity of the restoration.Relative to crowns, porcelain laminate veneers (PLVs) are a conservative treatment option to improve anterior aesthetics and have a long history of documented success.
#Labial veeer lam trial#
Although the trial met the review's inclusion criteria with regard to participant characteristics, interventions and outcomes assessed, problems with the reporting of the data prevented any statistical analysis of the results.
#Labial veeer lam full#
Six full publications were screened as being potentially relevant to the review, only one trial was found to meet the review's inclusion criteria. Authors of the primary studies were contacted to provide additional information as necessary. The primary outcome was restoration failure.Īssessment of relevance and validity and data extraction were conducted in triplicate. The indirect restorations may be either composite or porcelain. There was no restriction on language.Īll randomised controlled trials (RCTs) of participants with permanent anterior teeth suitable for restorations using laminate veneers, comparing direct (different composite materials) and indirect techniques for making dental veneers. The following electronic databases were searched: The Cochrane Oral Health Group's Trials Register, The Cochrane Central Register of Controlled Trials (CENTRAL), (The Cochrane Library Issue 3, 2002), MEDLINE (1980 to ) and EMBASE (1980 to ). To examine the effectiveness of direct versus indirect laminate veneer restorations. The veneer acts as a thin layer of a material covering the labial surface of a tooth and can be applied directly to the tooth, or by using indirect methods. For teeth that are sound, this might include the use of a veneer restoration.
Patients with discoloured teeth frequently present to the dentist requesting restorations designed to improve their appearance.
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