Colorimeter and scanning electron microscopy analysis of teeth submitted to internal bleaching.
BACKGROUND
This in vitro study compared the tooth color and the ultrastructure of internal dental tissues before and after internal bleaching.


METHODS
Sodium perborate was placed in the pulp chamber of endodontically treated molars and sealed with intermediate restorative material. The test samples were stored in a physiologic solution, and the bleaching agent was replaced every 7 days. A control group was used. After 1 month, the colors of the test and control samples were measured with a colorimeter, and the internal surfaces were observed under field emission scanning electron microscopy (FESEM).


RESULTS
Statistically significant differences were found between the test and control sample colors. The FESEM ultrastructure analysis of the internal enamel and dentin surfaces did not show any changes after the internal bleaching.


CONCLUSIONS
The results of the present study show that sodium perborate is effective in bleaching nonvital teeth and does not produce ultrastructural changes in the dental tissues.
Martin-Biedma
Benjamin
B
Division of Pathology and Dental Therapeutics, Department of Operative Dentistry and Endodontics, School of Dentistry, University of Santiago de Compostela, Santiago de Compostela, Galicia, Spain. benjamin.martin@usc.es
Gonzalez-Gonzalez
Teresa
T
Lopes
Manuela
M
Lopes
Luis
L
Vilar
Rui
R
Bahillo
José
J
Varela-Patiño
Purificación
P
D001881:Borates / Q000627:therapeutic use*; D003124:Colorimetry; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure; D003786:Dental Pulp Cavity / Q000187:drug effects* / Q000648:ultrastructure; D003804:Dentin / Q000187:drug effects / Q000648:ultrastructure; D006801:Humans; D008334:Mandible; D008963:Molar; D016877:Oxidants / Q000627:therapeutic use; D014073:Tooth Bleaching / Q000379:methods*; D014075:Tooth Discoloration / Q000188:drug therapy*; D019553:Tooth, Nonvital
D001881:Borates; D016877:Oxidants; C027707:sodium perborate