Banca de DEFESA: Jéssica Jacovetti Mesquita

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Jéssica Jacovetti Mesquita
DATE: 19/01/2024
TIME: 09:00
LOCAL: Plataforma Teams
TITLE:

In vitro Analysis of Sorption and Solubility, Color Stability, and Microhardness of Polymeric Materials for Temporary Crowns

KEY WORDS:

Three-dimensional printing, temporary crown, polymeric material, sorption, solubility, diffusion coefficient, color stability, spectrophotometry, microhardness test

PAGES: 100
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

“Objective: To evaluate the properties of water diffusion kinetics: sorption (SO), solubility (SL), and diffusion coefficient (CD); color stability; and microhardness of different polymeric materials used for conventional and printed temporary crowns. Materials and Methods: Printed resins (Prizma Bioprov, Makertech Labs), self-polymerizing acrylic resin (Dencôr, Classico), and bis-acrylic resin (Protemp 4, 3M ESPE) were utilized. For SO, SL, and CD testing, disc-shaped specimens (15 mm x 1 mm) were divided (n=5) into groups: printing resin (PR), self-polymerizing acrylic resin (AR), and bis-acrylic resin (BR). Testing was conducted according to ISO 4049:2009. The CD value in water (%) was calculated by summing sorption and solubility. For color stability testing, specimens of each material, in disc format (15x1mm), were immersed in distilled water (n=30), red wine (n=30), and coffee (n=30) for 7, 14, and 21 days. Subsequently, they were evaluated with the Easyshade® spectrophotometer (VITA). For Vickers microhardness testing, 5 specimens from each group (PR, AR, and BR) were assessed using a microhardness tester with three indentations at distinct locations; the obtained values were then combined to obtain the mean. The collected data underwent analysis of variance (ANOVA-1 criterion) for superficial microhardness, sorption, solubility, and diffusion coefficient tests. Two-way ANOVA with repeated measures was employed for color stability testing, considering each resin type, and Tukey's post-hoc test (p<0.05). Results: No statistically significant differences were found for microhardness (p=0.106) and solubility (p=0.932) tests concerning resin types. Both sorption and diffusion coefficient showed statistical differences (p<0.001) among the analyzed materials. Regarding color stability, there were statistical differences (p>0.001) in the interaction between immersion types and time in AR, BR, and PR. Additionally, there was a significant statistical difference in resin type and immersion time (p<0.002). AR exhibited color differences in wine and coffee immersions at 14 and 21 days compared to 7 days. BR showed color alteration with statistical differences when immersed in wine during the first 7 days, with a statistically significant increase over coffee immersion periods. For PR, the highest color change values occurred at 14 and 21 days. Conclusion: The three tested polymeric materials exhibit similar microhardness and solubility. The printing resin showed more significant color changes over time in red wine and coffee immersion and higher sorption and diffusion coefficients compared to self-polymerizing acrylic and bis-acrylic resins. Water diffusion kinetics may vary depending on the resin composition, which can be relevant for its long-term durability and clinical performance.”

COMMITTEE MEMBERS:
Externo à Instituição - SICKNAN SOARES DA ROCHA - UFG
Externa à Instituição - ANA PAULA RIBEIRO DO VALE PEDREIRA - UCB
Presidente - 1877052 - LILIANA VICENTE MELO DE LUCAS REZENDE
Interno - 1843167 - LUCAS FERNANDO TABATA