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Physicomechanical properties of different nanohybrid composites after aging: color stability, flexural strength, and microhardness
Cunha, Leonardo Fernandes da; Saab, Rafaella Caramori; Costacurta, Adriana Osten; Baechtold, Marina Samara; Zinelli, Rafaella Ronchi; Fernandes, Ana Beatriz Franco; Correr, Gisele Maria; Gonzaga, Carla Castiglia.
Affiliation
  • Cunha, Leonardo Fernandes da; Positivo University. School of Health Sciences. Curitiba. BR
  • Saab, Rafaella Caramori; Positivo University. School of Health Sciences. Curitiba. BR
  • Costacurta, Adriana Osten; Positivo University. School of Health Sciences. Curitiba. BR
  • Baechtold, Marina Samara; Positivo University. School of Health Sciences. Curitiba. BR
  • Zinelli, Rafaella Ronchi; Positivo University. School of Health Sciences. Curitiba. BR
  • Fernandes, Ana Beatriz Franco; Positivo University. School of Health Sciences. Curitiba. BR
  • Correr, Gisele Maria; Positivo University. School of Health Sciences. Curitiba. BR
  • Gonzaga, Carla Castiglia; Positivo University. School of Health Sciences. Curitiba. BR
Braz. j. oral sci ; 18: e191395, jan.-dez. 2019. ilus
Article in En | LILACS, BBO | ID: biblio-1087494
Responsible library: BR218.1
ABSTRACT

Aim:

To evaluate the physicomechanical properties of different hybrid composites (Charisma Diamond - CD, Aura - AU, NT Premium - NT, Opallis - OP, Filtek Z250 ­ Z250) after 6 months of aging in distilled water.

Methods:

Discs were fabricated and color measurements were performed after 24 hours and at 7, 30, and 180 days. Flexural strength was determined using the three-point bending test. For the microhardness test, the specimens were flattened to obtain polished and flat surfaces and indentations. The results for ∆E and microhardness were analyzed by two-way repeated-measures ANOVA and Tukey's HSD test. The flexural strength results were analyzed by two-way ANOVA and Tukey's test (α=0.05).

Results:

The ∆E values for composite resins varied in the following order CD (3.54)a < Z250 (4.70)ab < AU (4.95)ab < OP (5.20)ab < NT (6.23)b. ∆E values were lower for 24 h (3.84)a < 7 days (4.43)ab < 30 days (4.93)b. The highest values were observed after 180 days (ΔE = 6.54)c. The flexural strength of composite resins varied in the following order CD (89.17 MPa)a < Z250 (73.06 MPa)b < OP (60.30 MPa)c < NT (51.28 MPa)c < AU (23.77 MPa)d. Flexural strength values were significantly higher for 24 h (68.62 MPa)a < 180 days (51.40 MPa)b. The microhardness of composite resins varied in the following order Z250 (112.05)a < CD (102.15)ab < OP (92.04)bc < NT (87.77)d < AU (87.68)d. Microhardness was significantly higher for 180 days (113.44)a < 24 h (78.21)b.

Conclusion:

The microhybrid (Z250) and one of the nanohybrid composites (CD) performed better. The color stability and flexural strength of all tested composites decreased with storage time
Subject(s)
Key words

Full text: 1 Index: LILACS Main subject: Color / Mechanical Phenomena / Hardness Language: En Journal: Braz. j. oral sci Journal subject: ODONTOLOGIA Year: 2019 Type: Article

Full text: 1 Index: LILACS Main subject: Color / Mechanical Phenomena / Hardness Language: En Journal: Braz. j. oral sci Journal subject: ODONTOLOGIA Year: 2019 Type: Article