Effect of mastication simulation on the phase transformation of posterior 3-unit monolithic zirconia fixed dental prostheses
Küçük Resim Yok
Tarih
2021
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Mosby-Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Statement of problem. Monolithic zirconia restorations are directly exposed to cyclic loads and temperature changes in the oral cavity after cementation. These stresses may reduce the long-term success of the material by causing uncontrolled phase transformations within the zirconia. Purpose. The purpose of this in vitro study was to evaluate the effect of mastication simulation and different measurement points on the phase transformation of posterior 3-unit monolithic zirconia partial fixed dental prostheses (FDPs) in the posterior region. Material and methods. Posterior 3-unit FDPs of monolithic yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP), including BruxZir Shaded (group B), FireZr (group F), and Upcera (group U) (n=10), were machined from presintered blocks. All specimens were exposed to mastication simulation (240000 cycles/1.7 Hz/50 N). The monoclinic phase content was evaluated by X-ray diffraction (XRD). Phase transformation was measured at the mesial connector (group M), distal connector (group D), and pontic regions (group P) before and after mastication simulation. The relative monoclinic phase amount (Xm) was calculated for all specimens. The data were analyzed by ANOVA and post hoc tests (alpha=.05). Results. According to XRD analysis, Xm for all groups and regions showed higher results after aging than before aging (P<.05). Group B has the lowest Xm among the groups. Group B showed a statistically significant difference compared with both group F and group U (P<.05). There was no significant difference between group F and group U (P>.05). When the regions were evaluated regardless of brand and the groups were evaluated in terms of regions, no statistically significant difference was observed between connectors and the pontic region (P>.05). Conclusions. Mastication simulation causes an increase in the Xm. However, this increase was unlikely to be clinically significant. There may be differences in phase transformation depending on the contents of the brands and sintering procedures. Variations in the phase quantity were independent of the connector regions and pontic for FDPs.
Açıklama
24th International Congress of Turkish-Association-of-Prosthodontics-and-Implantology -- OCT 31-NOV 03, 2019 -- Mugla, TURKEY
Anahtar Kelimeler
Monoclinic Transformation, Structural Stability, Flexural Strength, Partial Dentures, Bond Strength, Performance, Resistance, Morphology, Surface
Kaynak
Journal of Prosthetic Dentistry
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
126
Sayı
6
