Document Detail


Fracture strength of direct versus indirect laminates with and without fiber application at the cementation interface.
MedLine Citation:
PMID:  17027938     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: This study compared the fracture strength of direct and indirect resin composite laminate veneers and evaluated the effect of a bidirectional E-glass woven fiber application at different locations at the cementation interface. METHODS: Standard preparations on canines (N=50, 10 per group) were made using a depth cutting bur (0.7mm depth) designed for laminate veneer restorations. Forty indirect laminates using a highly filled polymeric material (Estenia) and 10 direct laminates (Quadrant Anterior Shine) were prepared according to the manufacturer's instructions. Bidirectional E-glass woven-fiber sheet (0.06mm) (Everstick) was applied at different locations at the cementation interface. The control group received no fibers. The specimens were stored in water at 37 degrees C for 1 month prior to fracture testing performed in a universal testing machine where the load was applied from the incisal direction at 137 degrees (1mm/min). RESULTS: No significant differences were found between the five groups (P>0.01) (one-way ANOVA). While indirect laminate veneers showed mean fracture strength of 247+/-47N, direct laminate veneers revealed 239+/-104N. The use of E-glass fibers at the cementation interface at different locations did not increase the fracture strength significantly (286-313N) (P>0.01). Failure analysis showed mainly cohesive fracture of the veneer restoration (20/50) and adhesive failure between the cementation interface and the laminate with fiber exposure (19/50) covering more than half of the restorations. SIGNIFICANCE: Direct and indirect resin composite laminate veneers showed comparable mean fracture strengths. The use of E-glass woven-fiber sheet at the cementation interface did not increase the fracture strength of the polymeric laminate veneers.
Authors:
Marco M M Gresnigt; Mutlu Ozcan
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2006-10-06
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  23     ISSN:  0109-5641     ISO Abbreviation:  Dent Mater     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-06-20     Completed Date:  2007-10-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  927-33     Citation Subset:  D    
Affiliation:
University Medical Center Groningen, University of Groningen, Department of Dentistry and Dental Hygiene, Clinical Dental Biomaterials, Antonius Deusinglaan 1, Groningen, The Netherlands. marcogresnigt@yahoo.com
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Cementation*
Composite Resins*
Cuspid
Dental Restoration Failure*
Dental Stress Analysis
Dental Veneers*
Humans
Materials Testing
Methacrylates
Polyurethanes
Resin Cements
Chemical
Reg. No./Substance:
0/Composite Resins; 0/Methacrylates; 0/Polyurethanes; 0/Resin Cements; 0/everStick; 0/quadrant anterior shine; 0/urethanetrimethacrylate

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