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:

March/April 2011
Volume 13 , Issue 2



Pages: 139 - 145
Back
Share Abstract:

Effect of Dentin Age and Acid Etching Time on Dentin Bonding

Lopes, Guilherme Carpena / Vieira, Luiz C. / Ara˙jo, ╔lito / Bruggmann, Tatiana / Zucco, Jhonate / Oliveira, Gustavo

Purpose: To compare the bond strengths of young and old dentin using a single-bottle etch-and-rinse adhesive system with two acid-etching times (15 s and 30 s), and to examine the correlation between dentin hardness and bond strength. Materials and Methods: Twenty-four molars from 18- to 22- or 55- to 60-year-old patients were prepared to expose the occlusal dentin, cut into two equal parts, and assigned to four groups (G), varying the etching time (15 s and 30 s) and dentin age (young [Y]or old [O]): G15Y, G30Y, G15O and G30O. After etching, AdperSingleBond (3M ESPE) adhesive was applied and the tooth was built up with a composite (Filtek Z250). The specimens were prepared for the microtensile bond strength test (μTBS) at a crosshead speed of 0.5 mm/min and the interfaces were observed under SEM. Also, the Knoop hardness (KHN) of young vs old dentin was measured. Results: The mean (▒ SD) μTBS (MPa) were: G15Y = 45.9 (▒ 10.7)a, G15O = 34.1 (▒ 9.4)b, G30Y = 48.6 (▒ 14.3)a and G30O = 47.7 (▒ 11.0)a. Two-way ANOVA showed no difference in μTBS between young and old dentin. Old dentin acid etched for 15 s (G15O) had a lower μTBS than when acid etched for 30 s (G30O). Dentin hardness was higher for old dentin (67.0 ▒ 4.8KHN) than young dentin (63.7 ▒ 2.9KHN) (p < 0.004). No correlation between μTBS and dentin hardness was observed. Resin tags were larger and more numerous for young dentin. The hybrid layer formed in intertubular old dentin (G15O) was very thin. Conclusion: Bonding to old dentin with 30 s of etching time resulted in higher bond strength and more homogeneous hybrid layer formation than dentin acid etched for 15 s.

Keywords: acid etching, dentin bonding agents, old dentin, bond strength, scanning electron microscopy, microtensile bond strength, microhardness, bonding systems, 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