Marginal adaptation of lithium disilicate ceramic crowns cemented with three different resin cements

Peroz, Ingrid; Mitsas, Triantafyllos; Erdelt, Kurt und Kopsahilis, Niko (2019): Marginal adaptation of lithium disilicate ceramic crowns cemented with three different resin cements. In: Clinical Oral Investigations, Bd. 23, Nr. 1: S. 315-320

Abstract

ObjectivesThe cementation process and cementation materials have an influence on the marginal adaptation of restorations. The gap could be affected by thermal and mechanical loading (TCML). The computerized x-ray microtomography (CT) method offers the possibility of measuring the marginal gap without destruction of the restoration. The aim of this study was to evaluate the marginal gap (MG) and the absolute marginal discrepancy (AMD) before and after TCML.Materials and methodsThirty-nine human premolars were prepared for full ceramic crowns made of lithium disilicate. The crowns were cemented by three different resinsPanavia F 2.0, Variolink II, and Relyx Unicem. The MG and AMD were evaluated by CT before and after TCML.ResultsPanavia F 2.0 had the lowest MG (before 118m-after TMCL 124m) and AMD (before 145m-after TMCL 154m), followed by Relyx Unicem (MG: before 164m-after TCML 155m;AMD: before 213m-after TMCL 209m) and Variolink II (MG: before 317m-after TMCL 320m;AMD: before 412m-after TMCL 406m). The differences were statistically significant before and after TCML. Rather than TCML, it appeared the resin cement was responsible for differences between the MG and AMD before and after TCML.ConclusionsCT is an accurate technique for assessing cemented restorations. Panavia F 2.0 has the lowest MG and AMD before and after TCML.Clinical relevanceThe resin material that features a three-step protocol (Variolink II) produced higher MG and AMG values than the Panavia or Relyx Unicem varieties with less or no intermediate steps at all.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 1432-6981
• Sprache: Englisch