Back to Search
Start Over
Adhesive permeability affects coupling of resin cements that utilise self-etching primers to dentine
- Source :
-
Journal of Dentistry . Jan2004, Vol. 32 Issue 1, p55-65. 11p. - Publication Year :
- 2004
-
Abstract
- Objectives. To examine the effects of an experimental bonding technique that reduces the permeability of the adhesive layer on the coupling of resin cements to dentine.Methods. Extracted human third molars had their mid to deep dentin surface exposed flat by transversally sectioning the crowns. Resin composite overlays were constructed and cemented to the surfaces using either Panavia F (Kuraray) or Bistite II DC (Tokuyama) resin cements mediated by their respective one-step or two-step self-etch adhesives. Experimental groups were prepared in the same way, except that the additional layer of a low-viscosity bonding resin (LVBR, Scotchbond Multi-Purpose Plus, 3M ESPE) was placed on the bonded dentine surface before luting the overlays with the respective resin cements. The bonded assemblies were stored for 24 h in water at 37 °C and subsequently prepared for microtensile bond strength testing. Beams of approximately 0.8 mm2 were tested in tension at 0.5 mm/min in a universal tester. Fractured surfaces were examined under scanning electron microscopy (SEM). Additional specimens were prepared and examined with TEM using a silver nitrate-staining technique.Results. Two-way ANOVA showed significant interactions between materials and bonding protocols <f>(p<0.05).</f> When bonded according to manufacturer''s directions, Panavia F produced bond strengths that were significantly lower than Bistite II DC <f>(p<0.05).</f> The placement of an additional layer of a LVBR improved significantly the bond strengths of Panavia F <f>(p<0.05),</f> but not of Bistite II DC <f>(p>0.05).</f> SEM observation of the fractured surfaces in Panavia F showed rosette-like features that were exclusive for specimens bonded according to manufacturer''s directions. Such features corresponded well with the ultrastructure of the interfaces that showed more nanoleakage associated with the more permeable adhesive interface. The application of the additional layer of the LVBR reduced the amount of silver impregnation for both adhesives suggesting that reduced permeability of the adhesives resulted in improved coupling of the resin cements to dentin.Conclusions. Placement of an intermediate layer of a LVBR between the bonded dentine surface and the resin cements resulted in improved coupling of Panavia F to dentine. [Copyright &y& Elsevier]
- Subjects :
- *DENTIN
*GUMS & resins
*SURFACE coatings
*PERMEABILITY
*ANALYSIS of variance
*PHYSICAL & theoretical chemistry
*COMPARATIVE studies
*DENTAL acid etching
*DENTAL bonding
*DENTAL cements
*DENTAL resins
*ELECTRON microscopy
*MATERIALS testing
*RESEARCH methodology
*MEDICAL cooperation
*MOLARS
*RESEARCH
*VISCOSITY
*EVALUATION research
*TENSILE strength
*SURFACE properties
Subjects
Details
- Language :
- English
- ISSN :
- 03005712
- Volume :
- 32
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Dentistry
- Publication Type :
- Academic Journal
- Accession number :
- 11536023
- Full Text :
- https://doi.org/10.1016/j.jdent.2003.08.003