Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1)

Direct bilayered biomimetic composite restoration: The effect of a cusp-supporting short fiber-reinforced base design on the chewing fracture resistance and failure mode of molars with or without endodontic treatment




Julkaisun tekijätJasmina Bijelic-Donova, Filip Keulemans, Pekka K. Vallittu, Lippo V. J. Lassila

KustantajaElsevier

Julkaisuvuosi2020

JournalJournal of the Mechanical Behavior of Biomedical Materials

Lehden akronyymiJ Mech Behav Biomed Mater

Artikkelin numero103554

Volyymi103

DOIhttp://dx.doi.org/10.1016/j.jmbbm.2019.103554


Tiivistelmä

The aim of this study was to assess the chewing fracture resistance of compromised molars restored with direct composite resin (CR) restorations, with and without a short-fiber reinforcing (short-FRC) base. Wide extension of MOD cavities with removed palatal cusps preparations were simulated on 48 extracted maxillary molars. Five groups (n 1⁄4 12) were designed: 1. control (intact teeth), 2. non-endodontically treated and 3. endodontically treated teeth with direct CR restorations (GC-Posterior), and 4. non-endodontically treated and 5. endodontically treated teeth with direct biomimetic bilayered restorations. Groups 4 and 5 included an anatomically shaped short-FRC base (everX Posterior), covered with a 2 mm CR layer (GC-Posterior). Restorations were subjected to chewing in water (1.5 Hz), with load of 85 N. Specimens were loaded until fracture or to a maximum of 120 000 cycles. Restorations that survived the chewing cycle were submitted to static load test (post-chewing test). The data were statistically analyzed using two-way ANOVA (p 1⁄4 0.05) and fracture types with the chi-square test (p 1⁄4 0.05). Fractures were classified into reparable, possibly reparable or non-reparable. All specimens survived the chewing cycle. The chewing fracture resistance of the direct biomimetic restorations prepared on non- endodontically treated teeth (2889 N) was statistically significantly higher than the direct CR counterparts (1966 N) (p 1⁄4 0.00015), which was not the case for the groups with endodontically treated teeth (p 1⁄4 0.257). Inclusion of a short-FRC base also influenced the fracture type resulting in most reparable fractures (67–75% versus 25% for biomimetic and CR groups respectively) (p 1⁄4 0.054). Anatomically shaped i.e. a cusp-supporting design made of short-FRC base (everX Posterior) improved the chewing fracture resistance and fracture manner of compromised molars regardless of whether they were endodontically treated or not.


Last updated on 2022-13-06 at 16:15