scholarly journals Color stability of a resin composite: Effect of the immersion method and surface treatments

2016 ◽  
Vol 27 (2) ◽  
pp. 195 ◽  
Author(s):  
RO Rocha ◽  
LL Miotti ◽  
GF Nicoloso ◽  
LB Durand ◽  
AH Susin
2009 ◽  
Vol 17 (5) ◽  
pp. 388-391 ◽  
Author(s):  
Silvia Terra Fontes ◽  
María Raquel Fernández ◽  
Claudia Modena de Moura ◽  
Sônia Saeger Meireles

2012 ◽  
Vol 15 (4) ◽  
pp. 603-610 ◽  
Author(s):  
Nádia da Rocha Svizero ◽  
Roberta Caroline Bruschi Alonso ◽  
Linda Wang ◽  
Regina Guenka Palma-Dibb ◽  
Maria Teresa Atta ◽  
...  

LASER THERAPY ◽  
2017 ◽  
Vol 26 (3) ◽  
pp. 173-180 ◽  
Author(s):  
Nazanin Kiomarsi ◽  
Melika Espahbodi ◽  
Nasim Chiniforush ◽  
Mohammad Javd Karazifard ◽  
Sedighe Sadat Hashemi Kamangar

2015 ◽  
Vol 26 (5) ◽  
pp. 507-513 ◽  
Author(s):  
Lourenço de Moraes Rego Roselino ◽  
Michelle Alexandra Chinelatti ◽  
Carla Cecilia Alandia-Román ◽  
Fernanda de Carvalho Panzeri Pires-de-Souza

Abstract: Dentifrice abrasiveness and brushing time may increase color change (∆E) and surface roughness (∆Ra) of resin composites. This study aimed to evaluate the effect of mechanical brushing time of dentifrices with different abrasiveness on ∆E and ∆Ra of nanofilled (Z350, 3M ESPE) and nanohybrid (Tetric N-Ceram, Ivoclar Vivadent) resin composites. Sixteen specimens (12 mm diameter x 2 mm thick) were fabricated using a white Teflon matrix of each resin composite and a ceramic (IPS e.max Ceram, Ivoclar Vivadent), used as control. After initial color readouts on white backgrounds (Spectrophotometer PCB 6807, Byk Gardner), with D65 standard illuminant, and surface roughness (Rugosimeter Surfcorder SE 1700, Kosalab) with cut-off=0.8 mm and speed=0.25 mm/s, specimens were assigned (n=8) according to the abrasiveness of the dentifrices: RDA* 68 (Colgate) and RDA* 180 (Colgate Total Plus Whitening). Specimens were submitted to mechanical brushing (58,400 cycles) and after every 14,600 cycles (1 year of brushing by a healthy individual), new color and surface roughness readouts were taken. Color stability was calculated by CIEDE2000. Data were analyzed by 3-way repeated measures ANOVA and Bonferroni test (p<0.05), and demonstrated that the dentifrice abrasiveness (p=0.02) and brushing time (p<0.0001) affected the ∆E of nanofilled resin composite. There was no difference on surface roughness of materials (p=0.6752) or brushing time (p=0.7997). In conclusion, the longer the brushing time and dentifrice abrasiveness, the greater the color change of the nanofilled resin composite. The surface roughness was not influenced by dentifrice abrasiveness.


2021 ◽  
Vol 03 (02) ◽  
pp. 51-57
Author(s):  
Pydiahnaidu Bandaru ◽  
Nagesh Bolla ◽  
Rupadevi Garlapati ◽  
Sayesh Vemuri ◽  
Yamini Bandaru

Author(s):  
Siripan Simasetha ◽  
Awiruth Klaisiri ◽  
Tool Sriamporn ◽  
Kraisorn Sappayatosok ◽  
Niyom Thamrongananskul

Abstract Objective The study aimed to evaluate the shear bond strength (SBS) of lithium disilicate glass-ceramic (LDGC) and resin cement (RC) using different surface treatments. Materials and Methods LDGC blocks (Vintage LD Press) were prepared, etched with 4.5% hydrofluoric acid, and randomly divided into seven groups (n = 10), depending on the surface treatments. The groups were divided as follows: 1) no surface treatment (control), 2) Silane Primer (KS), 3) Signum Ceramic Bond I (SGI), 4) Signum Ceramic Bond I/Signum Ceramic Bond II (SGI/SGII), 5) experimental silane (EXP), 6) experimental silane/Signum Ceramic Bond II (EXP/SGII), and 7) Experimental/Adper Scotchbond Multi-purpose Adhesive (EXP/ADP). The specimens were cemented to resin composite blocks with resin cement and stored in water at 37 °C for 24 hours. The specimens underwent 5,000 thermal cycles and were subjected to the SBS test. Mode of failure was evaluated under the stereo microscope. Statistical Analysis Data were analyzed with Welch ANOVA and Games-Howell post hoc tests (α = 0.05). Results The highest mean SBS showed in group EXP/ADP (45.49 ± 3.37 MPa); however, this was not significantly different from group EXP/SGII (41.38 ± 2.17 MPa) (p ≥ 0.05). The lowest SBS was shown in the control group (18.36 ± 0.69 MPa). This was not significantly different from group KS (20.17 ± 1.10 MPa) (p ≥ 0.05). Conclusions The different surface treatments significantly affected the SBS value between LDGC and RC. The application of pure silane coupling agent with or without the application of an adhesive improved the SBS value and bond quality.


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