[The sealing effects of three desensitizers on tubule:an SEM investigation].
OBJECTIVE
The purpose of this in vitro study was to evaluate the sealing effects on tubule by three different dentin desensitizers.


METHODS
48 freshly extracted human premolars were selected. Their buccal dentin was exposed and a standardized circular area was isolated. They were randomly divided into three experiment groups and one control group. Dentin desensitizers included Systemp desensitizer, Seal&protect desensitizer and Gluma desensitizer. Twelve teeth were prepared for each test group (36 teeth total), and the other twelve teeth were selected as a control group. After the removal of cement, the dentin surfaces were cleaned, treated. Then the teeth were vertically cleaved into two sections. The surface and section of these teeth were observed by means of a scanning electron microscope.


RESULTS
All 3 desensitizers could seal the tubules on dentin surface. Systemp desensitizer's dentin permeability was better than Seal&protect, but Gluma had no dentin permeability.


CONCLUSIONS
3 desensitizers had sealing effect on tubule, systemo desensitizer was the best one.
Pan
Ming-di
MD
Department of Oral Medicine, Ninth People's Hospital, School of stomatology, Shanghai Second Medical University. Shanghai 200011, China. mindy_pan_615@hotmail.com
Huang
Yi-Feng
YF
D001641:Bicuspid / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D004338:Drug Combinations; D005976:Glutaral / Q000737:chemistry*; D006801:Humans; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*
D004338:Drug Combinations; D008689:Methacrylates; D019279:Resin Cements; C442646:Seal and Protect resin cement; C489334:Systemp.desensitizer; C111486:gluma desensitizer; D005976:Glutaral