Home Subscription Services
 
   

 
The Journal of Adhesive Dentistry
JAD Home Page
About the Editor
Editorial Board
Submit
Author Guidelines
Submission Form
Reprints / Articles
Permissions
Advertising
Advertising
MEDLINE Search
 
 
 
 
 
FacebookTwitter
Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

Summer 1999
Volume 1 , Issue 2



Pages: 119-131
Back
Share Abstract:

Variable Polymerisation Shrinkage and the Interfacial Micropermeability of a Dentin Bonding System.

Griffiths, Brigitte M.; Naasan, Mohamed; Sherriff, Martin; Watson, Timothy F

Purpose: Adhesive bonds are subjected to competing stresses whilst a restoration is setting. This study aimed to determine the effect of these stresses on a chemically- and light-activated dentin adhesive (Scotch Bond Multipurpose Plus: 5GMP+) by assessing the morphology and micropermeability of the interfaclal region. Materials and methods: Restorative materials and techniques were selected to impart differing setting stresses to the adhesive Interface. An amalgam (Dispersalloy), a light-activated composite (Z100) with a high- or low-intensity curing light and chemically-activated composite (Adaptic) were placed either in bulk (4 mm thickness) or in one thin layer (2 mm) in occlusal cavities in 55 freshly extracted third molars. In addition, thin composite restorations were placed on 15 horizontally sectioned teeth using a glass slide as a rigid clear matrix. The pulp chambers of all samples were filled with rhodamine B dye solution for 4 hours. Samples were longitudinally sectioned and the interfacial dye leakage measured using a confocal optical microscope. Data were analysed using the Kolmogorov-Smimov test. Results: In occlusal cavities, Z1OO had significantly more leakage than the amalgam and Adaptic. There was no significant difference m micropermeability between large and small increments, or curing light intensity for Z100, but when placed in bulk, there was evidence of incomplete composite polymerisation near the cavity floor, especially with the low intensity curing light. Cohesive failure of the deep resin composite and gap formation were a frequent finding with the high-intensity light curing. The least leakage for Z100 was achieved with a thin layer on flat dentin. In contrast, the chemically-activated composite performed well in bulk when the surface of the restoration was freely exposed, but badly when constrained by the glass matrix. Conclusion: Restoration setting stress is critical in the microscopic integrity of the adhesive bond to dentin.

Full Text PDF File | Order Article

 

 
  © 2014 Quintessence Publishing Co Inc
 

Home | Subscription Services | Books | Journals | Multimedia | Events | Blog
Terms of Use | Privacy Policy | About Us | Contact Us | Advertising | Help | Sitemap | Catalog