1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
2. Όλο το Αποθετήριο
3. Μεταδιδακτορικοί ερευνητές

Τύπος:	Αναρτημένη ανακοίνωση (poster)
Τίτλος:	Surface characterization of dental ceramics before and after thermal cycling and immersion in artificial gastric acid
Συγγραφέας:	[EL] Παντολέων, Παναγιώτης[EN] Pantoleon, Panagiotis [EL] Σαραφίδου, Κάτια[EN] Sarafidou, Katia [EL] Κοντονασάκη, Ελεάνα[EN] Kontonasaki, Eleana
Ημερομηνία:	07/09/2021
Περίληψη:	Nowadays there is a plethora of all-ceramic materials available in the dental market. Their different composition may result in different biological and mechanical behavior. Furthermore, temperature and pH alterations in the oral cavity may affect the biological properties and surface stability of dental ceramics. The aim of the present study was to investigate the impact of thermal artificial aging and exposure to artificial gastric acid on the surface roughness of monolithic zirconia (MZ) and zirconium lithium silicate (ZLS) ceramics. The null hypothesis was that surface roughness will not be affected after each aging treatment. Experimental Methods The following materials were included in the in vitro testing: Katana High Translucent - Kuraray (MZ) and Celtra Duo -Densply Sirona (ZLS). Twenty specimens were fabricated from each material in the following dimensions 10x10x1.5mm. Half of the specimens in each group underwent thermal artificial cycling, whilst the other half of them were immersed in artificial gastric acid. Thermal cycling was performed in distilled water. A total of 10.000 thermal cycles were performed between 37°C – 55°C – 37°C – 5°C, with a dwell time at each temperature of 15 seconds representing 1-year clinical time [1]. The gastric acid solution consisted of 5% hydrochloric acid (pH = 2). Specimens were immersed and placed in an incubator at 37 °C for 91 hours, equivalent to 1 year of exposure to HCl in a patient with bulimia [2]. Surface characterization was performed before and after thermal cycling and exposure to gastric acid through X-Ray Diffraction Analysis-XRD and roughness was measured with a 3D optical profilometer. The main roughness parameters Sa, Sz, Sp, Sv, and Sku were recorded, and data were statistically analyzed by one-way ANOVA with the level of significance set at p<0.05. Results and Discussion Initial mean values of surface roughness was 0.34 ( 0.1) μm for ΜΖ and 0.33 ( μm for ZLS without presenting any statistically significant difference between the two materials. After thermal cycling, mean surface roughness (Sa) was moderately affected by both treatments (p>0.05) accepting the null hypothesis. After immersion in artificial gastric acid all roughness parameters of MZ were slightly decreased, however the differences were not statistically significant. Similarly, non-significant differences were found for the roughness of ZLS ceramics. Ahmed et al. [3] resulted in similar conclusions, regarding milled ZLS ceramics and MZ, that presented non-significant "# alterations in roughness mean values after immersion in gastric acid with pH=1.2 for 96 hours. However, al-Thobity et al. [4] reported significant increase in surface roughness of MZ after prolonged in vitro aging of 168h in an acidic environment with pH=2.2. XRD analysis revealed the presence of cubic and tetragonal zirconia on the surface of MZ ceramics, without remarkable alterations after both thermal cycling and acidic storage. ! !0.06) However, different crystalline phases of lithium silicates (Li4(SiO4), Li2(Si2O5), Li2SiO3) were observed before and after both treatments. Qualitative analysis after in-vitro testing revealed that thermal cycling and immersion in gastric acid affected the surface micromorphology of ZLS to a greater extend compared with MZ. Conclusion Under the limitations of this in vitro study, it can be concluded that both dental ceramics are not affected by thermal cycling or storage in artificial gastric acid, at least for the specific time evaluated. However, slight morphological changes can occur under the thermal and pH fluctuations in the oral cavity which may accelerate the degradation of the materials and thus should be taken into consideration with respect to the biological long-term behavior of dental ceramics. Further long-term in vitro and in vivo studies are essential to validate these in vitro outcomes.
Γλώσσα:	Αγγλικά
Τόπος δημοσίευσης:	Πόρτο, Πορτογαλία
Σελίδες:	1
Θεματική κατηγορία:	[EL] Οδοντιατρική, Γναθοπροσωπική χειρουργική και Στοματολογία[EN] Dentistry, Oral Surgery and Medicine
Λέξεις-κλειδιά:	Dental ceramic; Gastric Acid
Κάτοχος πνευματικών δικαιωμάτων:	© The Author(s) 2021
Σελίδες τεκμηρίου (στην πηγή):	ID#1156 (poster number)
Όνομα εκδήλωσης:	31st Conference of the European Society for Biomaterials (ESB 2021)
Τοποθεσία εκδήλωσης:	Porto, Portugal
Ημ/νία έναρξης εκδήλωσης:	05/09/2021
Ημ/νία λήξης εκδήλωσης:	09/09/2021
Σημειώσεις:	This research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning» in the context of the project $Reinforcement of Postdoctoral Researchers - 2nd Cycle” (MIS-5033021), implemented by the State Scholarships Foundation (ΙΚΥ).
Εμφανίζεται στις συλλογές:	Μεταδιδακτορικοί ερευνητές