W. Carstensen

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  • W. Carstensen
  • American journal of orthodontics and dentofacial…
  • 1995
The purpose of this study was to evaluate in vitro the effect of the reduction of phosphoric acid concentration on the shear bond strength of brackets to enamel. Twelve pairs of contralateral maxillary premolars were randomly divided into group 1 and group 2. Twelve additional upper premolars formed group 3. The three acid concentrations examined were 37%(More)
In the first part of the study, the clinical results after the direct bonding of 1,134 metal mesh-backed brackets have been evaluated. The etching of enamel was carried out with a solution of 37% phosphoric acid for 30-35 seconds. The rates of loosened brackets during the treatment period were for the upper and lower anterior teeth, 1.89% and 0.66%,(More)
A total of 600 metal mesh-backed brackets were directly bonded to the anterior teeth of randomly selected orthodontic patients. Prior to bonding, enamel etching was carried out with 37% phosphoric acid on one side and with 2% phosphoric acid on the other side. The etch duration was 30 seconds. After 1 year no statistically significant difference was found(More)
The purpose of this study was to evaluate the effects of different acid concentrations on the enamel surface morphology. The buccal surfaces of 25 extracted premolars from young patients were etched with 40%, 20%, 10%, 5%, and 2% phosphoric acid solutions for 60 seconds. The specimens were examined with a scanning electron microscope in the occlusal,(More)
Die klinischen Ergebnisse nach direktem Kleben von 672 Metallbrackets mit Netzbasis an Frontzähnen von überwiegend jugendlichen Patienten wurden untersucht. Die Schmelzätzung erfolgte mit 37 % iger Phosphorsäure bei einer Einwirkungszeit von 15 bis 20 Sekunden. Die Quote der gelösten Brackets betrug nach zwölf Monaten 1,6%, und zwar 2,5% im Oberkiefer und(More)
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