Bond strength with various etching times on young permanent teeth

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · American Journal of Orthodontics and Dentofacial Orthopedics; (United States)

DOI:https://doi.org/10.1016/0889-5406(91)70052-X· OSTI ID:5449969

Wang, W N; Lu, T C ^[1]

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1. School of Dentistry, National Defense Medical Center, Taipei, Taiwan (China)

Tensile bond strengths of an orthodontic resin cement were compared for 15-, 30-, 60-, 90-, or 120-second etching times, with a 37% phosphoric acid solution on the enamel surfaces of young permanent teeth. Fifty extracted premolars from 9- to 16-year-old children were used for testing. An orthodontic composite resin was used to bond the bracket directly onto the buccal surface of the enamel. The tensile bond strengths were tested with an Instron machine. Bond failure interfaces between bracket bases and teeth surfaces were examined with a scanning electron microscope and calculated with mapping of energy-dispersive x-ray spectrometry. The results of tensile bond strength for 15-, 30-, 60-, or 90-second etching times were not statistically different. For the 120-second etching time, the decrease was significant. Of the bond failures, 43%-49% occurred between bracket and resin interface, 12% to 24% within the resin itself, 32%-40% between resin and tooth interface, and 0% to 4% contained enamel fragments. There was no statistical difference in percentage of bond failure interface distribution between bracket base and resin, resin and enamel, or the enamel detachment. Cohesive failure within the resin itself at the 120-second etching time was less than at other etching times, with a statistical significance. To achieve good retention, to decrease enamel loss, and to reduce moisture contamination in the clinic, as well as to save chairside time, a 15-second etching time is suggested for teenage orthodontic patients.

• OSTI ID: 5449969
• Journal Information: American Journal of Orthodontics and Dentofacial Orthopedics; (United States), Vol. 100:1; ISSN 0889-5406
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
RESINS
TENSILE PROPERTIES
TEETH
SURFACE PROPERTIES
ADOLESCENTS
COMPOSITE MATERIALS
DENTISTRY
ELECTRON MICROPROBE ANALYSIS
ENAMELS
SCANNING ELECTRON MICROSCOPY
X-RAY SPECTRA
AGE GROUPS
CHEMICAL ANALYSIS
COATINGS
DIGESTIVE SYSTEM
ELECTRON MICROSCOPY
MATERIALS
MECHANICAL PROPERTIES
MEDICINE
MICROANALYSIS
MICROSCOPY
NONDESTRUCTIVE ANALYSIS
ORAL CAVITY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
SPECTRA
550602* - Medicine- External Radiation in Diagnostics- (1980-)