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Korean J Orthod
Copyright © The Korean Association of Orthodontists.
Yasamin Babaee Hemmati, DDS, MSca, Hamid Neshandar Asil, DDS, MScb, Alireza Mahmoudi Nahavandi PhDc, Nika Safari DDSd, Mehran Falahchai, DDS, MSce
a assistant professor, dental sciences research center, department of orthodontics, school of dentistry, guilan university of medical sciences, rasht, iran.
b professor, dental sciences research center, department of prosthodontics, school of dentistry, guilan university of medical sciences, rasht, iran.
c color imaging and color image processing department, institute for color science and technology, tehran, iran
d dental student, dental sciences research center, school of dentistry, guilan university of medical sciences, rasht, iran.
e assistant professor, dental sciences research center, department of prosthodontics, school of dentistry, guilan university of medical sciences, rasht, iran.
Correspondence to:Dr. Mehran Falahchai
Assistant Professor, Dental Sciences Research Center, Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Address: Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht-Fooman Road, Rasht, Iran.
Phone: +98-9119427927
E-mail: Mehran.falahchai@gmail.com
Fax number: 98-1333486423
Objective: To assess the effect of orthodontic bonding with different surface treatments on color stability and translucency of full cubic stabilized zirconia (FSZ) after coffee thermocycling (CTC).
Materials & Methods: This in vitro study was conducted on 120 disc-shaped specimens of FSZ. Thirty specimens were considered as the control group and remained intact. The remaining specimens were randomly divided into three groups based on the type of surface treatment (n=30): airborne particle abrasion (APA), silica-coating (CoJet), and carbon dioxide (CO2) laser. After metal bracket bonding in the test groups, debonding and polishing were performed. Subsequently, all specimens underwent CTC (10,000 cycles). Color parameters, color difference (ΔE00), and translucency parameter (TP) were measured three times at baseline (t0), after debonding and polishing (t1), and after CTC (t2). Data were analyzed by paired t-test, repeated measures ANOVA, Bonferroni, Tukey, and Games-Howell tests (α=0.05).
Results: Significant difference existed among the groups regarding ΔE00t0t2 (P<0.001). The APA group showed minimum (ΔE00 = 1.15 ± 0.53) and the control group showed maximum (ΔE00 = 0.19 ± 0.02) color stability, with no significant difference between the laser and CoJet groups (P=0.511). The four groups were significantly different regarding ΔTPt0t2 (P<0.001). Maximum increase in TP was noted in the CoJet (1.00 ± 0.18) and APA (1.04 ± 0.38) groups while minimum increase was recorded in the control group (0.1 ± 0.02).
Conclusions: Orthodontic treatment makes zirconia restorations susceptible to discoloration and increased translucency. Nonetheless, the recorded ΔE00 and ΔTP did not exceed the acceptability threshold.
Keywords: Y-TZP Ceramic, Brackets, Color, Surface Treatment
Korean J Orthod
First Published Date December 2, 2022
Copyright © The Korean Association of Orthodontists.
Yasamin Babaee Hemmati, DDS, MSca, Hamid Neshandar Asil, DDS, MScb, Alireza Mahmoudi Nahavandi PhDc, Nika Safari DDSd, Mehran Falahchai, DDS, MSce
a assistant professor, dental sciences research center, department of orthodontics, school of dentistry, guilan university of medical sciences, rasht, iran.
b professor, dental sciences research center, department of prosthodontics, school of dentistry, guilan university of medical sciences, rasht, iran.
c color imaging and color image processing department, institute for color science and technology, tehran, iran
d dental student, dental sciences research center, school of dentistry, guilan university of medical sciences, rasht, iran.
e assistant professor, dental sciences research center, department of prosthodontics, school of dentistry, guilan university of medical sciences, rasht, iran.
Correspondence to:Dr. Mehran Falahchai
Assistant Professor, Dental Sciences Research Center, Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Address: Department of Prosthodontics, School of Dentistry, Guilan University of Medical Sciences, Rasht-Fooman Road, Rasht, Iran.
Phone: +98-9119427927
E-mail: Mehran.falahchai@gmail.com
Fax number: 98-1333486423
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Objective: To assess the effect of orthodontic bonding with different surface treatments on color stability and translucency of full cubic stabilized zirconia (FSZ) after coffee thermocycling (CTC).
Materials & Methods: This in vitro study was conducted on 120 disc-shaped specimens of FSZ. Thirty specimens were considered as the control group and remained intact. The remaining specimens were randomly divided into three groups based on the type of surface treatment (n=30): airborne particle abrasion (APA), silica-coating (CoJet), and carbon dioxide (CO2) laser. After metal bracket bonding in the test groups, debonding and polishing were performed. Subsequently, all specimens underwent CTC (10,000 cycles). Color parameters, color difference (ΔE00), and translucency parameter (TP) were measured three times at baseline (t0), after debonding and polishing (t1), and after CTC (t2). Data were analyzed by paired t-test, repeated measures ANOVA, Bonferroni, Tukey, and Games-Howell tests (α=0.05).
Results: Significant difference existed among the groups regarding ΔE00t0t2 (P<0.001). The APA group showed minimum (ΔE00 = 1.15 ± 0.53) and the control group showed maximum (ΔE00 = 0.19 ± 0.02) color stability, with no significant difference between the laser and CoJet groups (P=0.511). The four groups were significantly different regarding ΔTPt0t2 (P<0.001). Maximum increase in TP was noted in the CoJet (1.00 ± 0.18) and APA (1.04 ± 0.38) groups while minimum increase was recorded in the control group (0.1 ± 0.02).
Conclusions: Orthodontic treatment makes zirconia restorations susceptible to discoloration and increased translucency. Nonetheless, the recorded ΔE00 and ΔTP did not exceed the acceptability threshold.
Keywords: Y-TZP Ceramic, Brackets, Color, Surface Treatment
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