title: [Surface and circumference determination in resin-bonded retainer elements: a possibility for long-term prognosis?].
abstract: An evaluation of about 300 abutment teeth of resin-bonded bridges (Rochette, electrochemically etched) and resin-bonded extracoronal attachments was performed to determine the surface area and the length of the circumference of the retainers. By using a combined indirect (preparation of the specimen) and direct (automatic image analysis) method for the determination of both parameters a mean value of 50 mm2 for the surface area and 30 mm for the circumference, respectively, was evaluated. In addition, two indices (loading-index (BI): sigma surface area/width of pontic tooth; moisture penetration-index (FPI): sigma surface area/sigma circumferences) as predictors for the longevity of resin-bonded reconstructions were calculated. The loading-index was a good predictor for successful reconstructions: the clinical success was the better, the bigger the retention area, and the smaller the circumference of the retainer and the smaller the pontic tooth.
authors.affiliation: Abteilung für Kronen-Brückenprothetik, Teilprothetik und Zahnärztliche Materialkunde, Zahnärztliches Institut, Universität Zürich, Schweiz.
authors.forename: C P
authors.initials: CP
authors.lastname: Marinello
authors.forename: H
authors.initials: H
authors.lastname: Lüthy
authors.forename: T
authors.initials: T
authors.lastname: Kerschbaum
authors.forename: P
authors.initials: P
authors.lastname: Schärer
mesh_terms: D000044:Dental Abutments; D001840:Dental Bonding; D003779:Denture Design; D003781:Denture Retention; D003829:Denture, Partial; D006801:Humans; D011379:Prognosis; D013499:Surface Properties; D013674:Technology, Dental / Q000379:methods; D013997:Time Factors
vernacular_title: Die Flächen- und Umfangbestimmung bei Adhäsivhalte-Elementen: eine Möglichkeit der Langzeitprognose?