Tensile strength of dentin after bleaching treatment.
The mechanical properties of dentin are changed after bleaching, although the effects of the bleaching conditions on the tensile strength of dentin have not been determined. In the current study, a tensile test of bovine dentin was conducted after bleaching and the effects of the bleaching conditions were investigated, including the number of bleaching times, the location where the bleaching agent was applied, and the kind of illumination. The weight of organic content in dentin before and after application of the agent was also measured. The results showed that the tensile strengths did not change after three times office bleaching procedure, and the location where the bleaching agent was applied, the kind of bleaching agent and the kind of illumination did not have influence on the tensile strength. On the other hand, organic component in dentin significantly decreased after application of the agent (p<0.05). Since the bleaching agent would potentially affect tensile strength with deterioration of collagen matrix, the frequency of bleaching treatment should be minimized in clinical use.
General Dentistry Department of Comprehensive Oral Health Care, Division of Comprehensive Patient Care, Graduate School, Tokyo Medical and Dental University, Japan.
Tomohiro
T
Tamura
Ken-ichi
K
Tonami
Hidekazu
H
Takahashi
Shiro
S
Mataki
Kouji
K
Araki
Norimasa
N
Kurosaki
D000818:Animals; D000077463:Carbamide Peroxide; D002417:Cattle; D003094:Collagen / Q000187:drug effects; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry / Q000187:drug effects*; D004338:Drug Combinations; D004591:Electrophoresis, Polyacrylamide Gel; D006861:Hydrogen Peroxide / Q000009:adverse effects*; D016877:Oxidants / Q000009:adverse effects*; D010545:Peroxides / Q000009:adverse effects*; D013718:Tensile Strength / Q000187:drug effects; D014073:Tooth Bleaching / Q000009:adverse effects*; D014508:Urea / Q000009:adverse effects / Q000031:analogs & derivatives*
D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea; D003094:Collagen; D006861:Hydrogen Peroxide