Rogelio José Scougall Vilchis1, Yasuaki Hotta, Kohji Yamamoto. 1. Department of Operative Dentistry, Division of Oral Functional Sciences and Rehabilitation, School of Dentistry, Asahi University, Mizuho City, Gifu Pref, Japan. rogelio@dent.asahi-u.ac.jp
Abstract
INTRODUCTION: The purpose of this study was to observe, with a scanning electron microscope, the interface between enamel and orthodontic adhesive after focused ion-beam milling. In addition, enamel etched with phosphoric acid was compared with enamel conditioned with self-etching primer. METHODS: Four freshly extracted human premolars were collected and pumiced by using rubber cups with fluoride-free paste, washed, and dried. The enamel of 2 teeth was etched with 37% phosphoric acid for 30 seconds, washed, and dried; the enamel of the other 2 teeth was conditioned with self-etching primer for 5 seconds. Stainless steel brackets were bonded with Transbond XT adhesive (3M Unitek, Monrovia, Calif) according to the manufacturer's instructions. The specimens were milled by focused ion beam and observed under the scanning electron microscope. RESULTS: The scanning electron micrographs showed that 37% phosphoric acid seemed to produce more enamel loss than the self-etching primer. Moreover, the enamel-adhesive interface was more irregular when the enamel was etched with 37% phosphoric acid. Finally, a gentler etch pattern of the self-etching primer on the enamel surface was observed, and this conditioner could be used clinically for minimal intervention in the orthodontic bonding procedure. CONCLUSIONS: Focused ion-beam milling to prepare samples allowed clear observation of the enamel-adhesive interface without artificial damage.
INTRODUCTION: The purpose of this study was to observe, with a scanning electron microscope, the interface between enamel and orthodontic adhesive after focused ion-beam milling. In addition, enamel etched with phosphoric acid was compared with enamel conditioned with self-etching primer. METHODS: Four freshly extracted human premolars were collected and pumiced by using rubber cups with fluoride-free paste, washed, and dried. The enamel of 2 teeth was etched with 37% phosphoric acid for 30 seconds, washed, and dried; the enamel of the other 2 teeth was conditioned with self-etching primer for 5 seconds. Stainless steel brackets were bonded with Transbond XT adhesive (3M Unitek, Monrovia, Calif) according to the manufacturer's instructions. The specimens were milled by focused ion beam and observed under the scanning electron microscope. RESULTS: The scanning electron micrographs showed that 37% phosphoric acid seemed to produce more enamel loss than the self-etching primer. Moreover, the enamel-adhesive interface was more irregular when the enamel was etched with 37% phosphoric acid. Finally, a gentler etch pattern of the self-etching primer on the enamel surface was observed, and this conditioner could be used clinically for minimal intervention in the orthodontic bonding procedure. CONCLUSIONS: Focused ion-beam milling to prepare samples allowed clear observation of the enamel-adhesive interface without artificial damage.
Authors: José Maurício da Rocha; Marco Abdo Gravina; Marcio José da Silva Campos; Cátia Cardoso Abdo Quintão; Carlos Nelson Elias; Robert Willer Farinazzo Vitral Journal: Dental Press J Orthod Date: 2014 Jan-Feb
Authors: I Mézquita-Rodrigo; R J Scougall-Vilchis; M A Moyaho-Bernal; L E Rodríguez-Vilchis; E Rubio-Rosas; R Contreras-Bulnes Journal: Eur Arch Paediatr Dent Date: 2021-08-07