Zusammenfassung
Versagensursache Nr. 1 bei Keramikinlays ist die Fraktur. Während bei katastrophalen
Frakturen (bulk fractures) eine Neuanfertigung der Restauration obligat ist, stellt
sich z.B. bei Aussprengungen an der Randleiste (Chipping) die Frage nach der Reparabilität.
40 IPS-Empress-Inlays (mo) wurden in extrahierte Molaren eingesetzt und für 2 Jahre
in Wasser gelagert. Es erfolgte die Präparation von keramikbegrenzten Reparaturkavitäten
(n = 8), die vor der Aufnahme einer Komposit-Reparaturfüllung unterschiedlich vorbehandelt
wurden: A: Flusssäure (5 %) und Silan, B: Intraorale Silikatisierung (CoJet) und Silan,
C: Sandstrahlen (50 μm) und Silan, D: Phosphorsäure und Silan, E: nur Silan. Nach
dem Legen der Füllungen und Wasserlagerung erfolgte eine thermomechanische Wechselbelastung
(TMW: 100000 Zyklen à 50 N, 2500 Thermozyklen 5 °C/55 °C). Vor und nach der TMW wurden
Replikas erstellt und rasterelektronenoptisch auf ihre Randqualität untersucht. Die
Resultate nach TMW zeigten folgende Signifikanzen (p < 0,05): A = B > C > D = E.
Flusssäure und CoJet-Verfahren zeigen selbst nach Kausimulation noch fast 100 % perfekte
Ränder zur Keramik.
Summary
Fractures remain the no. 1 failure reason with ceramic inlays. Bulk fractures still
require complete rerestoration, however chippings in ceramic may be repaired. 40 IPS
Empress inlays (MO) were inserted in extracted molars and stored in water for 2 years.
Repair cavities in ceramic were prepared (n = 8), having been pretreated prior to
restoration with resin composite as follows: A: Hydrofluoric acid (5 %) + silane coupling
agent (SCA), B: CoJet + SCA, C: Air-abrasion (50 μm) + SCA, D: Phosphoric acid (36
%) + SCA, E: SCA only. After restoration and water storage, thermomechanical loading
was performed (TML: 100000 x 50 N, 2500 x 5 °C/55 °C). Before and after TML, epoxy
replicas were made and investigated for marginal quality under a SEM. Results after
TML exhibit the following significant differences: (p < 0,05): A = B > C > D = E.
Hydrofluoric acid as well as CoJet pretreatment show nearly perfect margins even after
TML.
Schlüsselwörter
Keramik - Adhäsive - Komposit - Sandstrahlen - Silikatisieren
Key Words
Ceramics - Adhesives - Resin Composites - Air Abrasion - Silica Coating
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Korrespondenzadresse
PD Dr. Roland Frankenberger
Glückstr. 11
91054 Erlangen
Email: frankbg@dent.uni-erlangen.de
