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KMID : 0362320100350010030
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Journal of Korean Academy of Operative Dentistry
2010 Volume.35 No. 1 p.30 ~ p.39
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THE EFFECT OF THE AMOUNT OF INTERDENTAL SPACING ON THE STRESS DISTRIBUTION IN MAXILLARY CENTRAL INCISORS RESTORED WITH PORCELAIN LAMINATE VENEER AND COMPOSITE RESIN: A 3D-FINITE ELEMENT ANALYSIS
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Hong Jun-Bae
Tak Seung-Min
Baek Seung-Ho
Cho Byung-Hoon
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Abstract
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This study evaluated the influence of the type of restoration and the amount of interdental spacing on the stress distribution in maxillary central incisors restored by means of porcelain laminate veneers and direct composite resin restorations. Three-dimensional finite element models were fabricated to represent different types of restorations. Four clinical situations were considered. Type I, closing diastema using composite resin. Labial border of composite resin was extended just enough to cover the interdental space; Type II, closing diastema using composite resin without reduction of labial surface. Labial border of composite resin was extended distally to cover the half of the total labial surface; Type III, closing diastema using composite resin with reduction of labial surface. Labial border of the preparation and restored composite resin was extended distally twothirds of the total labial surface; Type IV, closing diastema using porcelain laminate veneer with a feathered- edge preparation technique. Four different interdental spaces (1.0, 2.0, 3.0, 4.0 mm) were applied for each type of restorations. For all types of restoration, adding the width of free extension of the porcelain laminate veneer and composite resin increased the stress occurred at the bonding layer. The maximum stress values observed at the bonding layer of Type IV were higher than that of Type I, II and III. However, the increasing rate of maximum stress value of Type IV was lower than that of Type I, II and III. [J Kor Acad Cons Dent 35(1):30-39, 2010]
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KEYWORD
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Three dimensional-finite element analysis, Interdental space, Porcelain laminate veneer, Composite resin, Bonding layer, Stress distribution -Received 2009.12.30., revised 2010.1.4., accepted 2010.1.4.-
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