Effect of base layer thickness of a self-adhesive resin on dentin bonding strength / 中华口腔医学杂志
Chinese Journal of Stomatology
;
(12): 93-97, 2016.
Article
in Chinese
| WPRIM
| ID: wpr-259437
ABSTRACT
<p><b>OBJECTIVE</b>To evaluate the effect of base layer thickness of DyadFlow(DF) self-adhesive resin on dentin bonding strength.</p><p><b>METHODS</b>Twenty extracted intact human molars were randomly selected and the occlusal surface of each molar was prepared by removing the enamel and exposing the dentin surface. The prepared molars were divided, randomly and equally, into 4 groups. For groups G0.5, G1.0 and G2.0, DF was applied directly on the dentin surfaces following the manufacturer's instruction, and for group GOB, OptiBond All-in-One(OB) self etching adhesive was applied on the dentin surface before using DF. The base layer thickness of DF was 0.5 mm, 1.0 mm, 2.0 mm, 2.0 mm for groups G0.5, G1.0, G2.0 and GOB, respectively. Composite crown were built up on each tooth, then the samples were sectioned longitudinally into sticks with proximately 1.0 mm2 bonding area(for microtensile bond strength[MTBS] testing) or slabs (for bonding interface observation with SEM). Fifteen sticks were obtained for each group. The fracture surface was also observed using SEM and the fracture type of each specimen was determined.</p><p><b>RESULTS</b>The MTBS were GOB (20.19±3.11) MPa>G0.5 (8.65±1.58) MPa>G1.0 (6.65±1.13) MPa>G2.0 (5.70±0.60) MPa(P<0.05). Bonding interface fracture B2 was most frequently observed for all groups G0.5 14/15, G1.0 13/15, G2.0 14/15 and GOB 13/15.</p><p><b>CONCLUSIONS</b>The MTBS decreased when the base layer thickness of DF increased. Direct application of DF self-adhesive resin on dentin surface adhesive restorations should be concerned.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Tensile Strength
/
Chemistry
/
Adhesives
/
Dental Bonding
/
Dentin-Bonding Agents
/
Resin Cements
/
Crowns
/
Dental Enamel
/
Dentin
/
Molar
Limits:
Humans
Language:
Chinese
Journal:
Chinese Journal of Stomatology
Year:
2016
Type:
Article
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