[Two-dimensional morphology of microleakage between dentin and adhesives].
OBJECTIVE
To observe the two-dimensional morphology of microleakage between dentin and adhesives.


METHODS
The occlusal enamel of human third molar was cut out and the dentin exposed, followed by the application of dental adhesive (Prime & Bond NT, Contax and Adper Prompt), then a composite resin crown was built up. After storage in water (37 degrees C) for 24 h, all teeth were vertically serially sectioned into matchstick-shaped specimens through the bond interfaces. Half of the specimens from one tooth were subjected to thermal cycling and another half was stored in water (37 degrees C). All specimens were then immersed in ammoniacal silver nitrate solution, followed by developing solution. At last all specimens were subjected to microtensile test at a cross-head speed of 1.0 mm/min and their fractured surfaces were observed under scanning electron microscope.


RESULTS
The planar contour of all the silver leakage was various branching, treelike shape, spreading from the border of section to the center.


CONCLUSIONS
The planar contour of microleakage is treelike shape and its extent is influenced by adhesives and thermal cycling.
Zhao
Xin-yi
XY
Department of Dental Materials, School of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
He
Hui-ming
HM
Liu
Fang
F
Wang
Jun-cheng
JC
D000269:Adhesives; D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D003743:Dental Enamel; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D019279:Resin Cements; D013718:Tensile Strength
D000269:Adhesives; D003188:Composite Resins; C483521:Contax; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D019279:Resin Cements