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Effect of radiation and antioxidant on dentin-composite bonding
d e n t a l m a t e r i a l s 3 2 S ( 2 0 1 6 ) e1–e103
202
that the visual analyzes have less capacity to detect bleaching shade differences than instrumental analysis.
Longitudinal clinical study: 3 in-office bleaching protocols, one year follow-up Cardoso ∗ ,
P.E. Capel F.U. Gentil
http://dx.doi.org/10.1016/j.dental.2016.08.203
B.A. Lopes, H.B. Porcelli,
Purpose/aim: Longitudinal clinical studies, which follow patients over a long period of time, are not very common in the dental literature, especially when associated with large samples. This study evaluated the efficacy and color stability of three in-office bleaching systems over a period of time of 365 d. Materials and methods: A randomized clinical trial was conducted with 90 volunteers divided into 3 Groups (Table 1) (n = 30); subjects for Groups 1 and 3 underwent a bleaching treatment session according to manufacturer’s instructions while an authors’ variation of the technique was used for Group 2. Color changes were measured using a spectrophotometer (Vita-Easyshade) and the shade guides Vita-Classical and Vita-Bleachedguide 3D-Master. Color assessments were made on superior central incisives and canines before, immediately after and at 7, 14, 30, 180 and 365 d post treatment. The data obtained was submitted to statistical analyses of variance (ANOVA) with the use of the software Statistica 8.0 (StatSoft-Dell) and comparisons were made using contrasts (Tukey test). Results: The highest whitening result was obtained by Group 1, at immediate post treatment and for all evaluations thereafter. Results for Groups 2 and 3 were statistically similar among themselves. All treatments promoted tooth whitening and maintained the bleaching effect for 365 days; none of the participants in this study had fadeback to the same shade color levels that were registered before the bleaching treatments. Vita-Easyshade spectrophotometer detected statistically significant differences at the immediately post treatment assessment, while for the other two measurement methods it was only at the 30 d evaluation that statistically significant differences were first observed.
Table 1 – Groups clinical study. Group
Whitening gel
Gel concentration
Light source
1
Zoom Whitespeed Bleaching Gel (Phillips Oral Healthcare) Zoom Whitespeed Bleaching Gel (Phillips Oral Healthcare) Boost Opalescence Xtra Boost (Ultradent)
25% HP
Whitespeed LED light (Phillips Oral Healthcare)
25% HP
No light
3
203 Effect of radiation and antioxidant on dentin-composite bonding
University of Sao Paulo, Brazil
2
e97
A. Costa 1,∗ , L. Correr-Sobrinho 1 , C.J. Soares 2 , R.M. Puppin-Rontani 1 , E.F. Soares 1 , A.B. Correr 1 , M.A.C. Sinhoreti 1 1 2
State University of Campinas, Brazil Federal University of Uberlândia, Brazil
Purpose/aim: The aim of this study was to evaluate the effect of radiotherapy and antioxidant N-acetyl cysteine (NAC) on the microtensile bond strength (TBS) of the dentincomposite interface. Materials and methods: Thirty human thirds molars were sectioned to expose middle dentin surface and distributed into 6 groups (n = 5), according to application or not of NAC for 5 s, before the adhesive Clearfil SE Bond and submission or not of 60 Gy total radiation (2 Gy daily doses, 5 days/week, for 6 weeks): G1: Control group, without radiotherapy and without application of NAC; G2: Control group, without radiotherapy and with application of NAC; G3: RestRtWt, was submitted to radiotherapy after restoration procedure without application of NAC; G4: RestRtNAC, was submitted to radiotherapy after restoration procedure with application of NAC; G5: RtRestWt was submitted to radiotherapy before restoration procedure without application of NAC; and, G6: RtRestNAC, was submitted to radiotherapy before restoration procedure with application of NAC. A block of 6 mm thickness resin composite Z250 (3M ESPE) was constructed on dentin and each 2 mm thickness was light cured for 40 s. After stored in deionized water at 37 ◦ C for 24 h, the specimens were sectioned perpendicularly to bonding area to obtain sticks with a crosssectional area of 1 mm2 , and submitted to the TBS at a crosshead speed of 0.5 mm/min. Data were submitted to two ANOVA and Tukey’s test (˛ = 0.05). Results: Bond strength values (MPa – mean ± standard deviation) for the specimens with or without application of NAC were: Control group (42.5 ± 6.3 and 49.2 ± 9.4) and Groups RestRt (49.9 ± 6.2 and 53.0 ± 1.7) were significantly higher than groups RtRest (37.7 ± 8.4 and 45.9 ± 7.3) (p < 0.05). The antioxidant NAC significantly reduced TBS compared to groups without NAC application (p < 0.05). Conclusions: The radiotherapy before composite restoration procedure decreased the TBS. The use of antioxidant NAC reduced TBS for all conditions. http://dx.doi.org/10.1016/j.dental.2016.08.204
38% HP
No light
Conclusions: Group 1 presented the highest bleaching results and color stability was registered for all the experimental groups at the 365-day period. In addition it was observed
202
that the visual analyzes have less capacity to detect bleaching shade differences than instrumental analysis.
Longitudinal clinical study: 3 in-office bleaching protocols, one year follow-up Cardoso ∗ ,
P.E. Capel F.U. Gentil
http://dx.doi.org/10.1016/j.dental.2016.08.203
B.A. Lopes, H.B. Porcelli,
Purpose/aim: Longitudinal clinical studies, which follow patients over a long period of time, are not very common in the dental literature, especially when associated with large samples. This study evaluated the efficacy and color stability of three in-office bleaching systems over a period of time of 365 d. Materials and methods: A randomized clinical trial was conducted with 90 volunteers divided into 3 Groups (Table 1) (n = 30); subjects for Groups 1 and 3 underwent a bleaching treatment session according to manufacturer’s instructions while an authors’ variation of the technique was used for Group 2. Color changes were measured using a spectrophotometer (Vita-Easyshade) and the shade guides Vita-Classical and Vita-Bleachedguide 3D-Master. Color assessments were made on superior central incisives and canines before, immediately after and at 7, 14, 30, 180 and 365 d post treatment. The data obtained was submitted to statistical analyses of variance (ANOVA) with the use of the software Statistica 8.0 (StatSoft-Dell) and comparisons were made using contrasts (Tukey test). Results: The highest whitening result was obtained by Group 1, at immediate post treatment and for all evaluations thereafter. Results for Groups 2 and 3 were statistically similar among themselves. All treatments promoted tooth whitening and maintained the bleaching effect for 365 days; none of the participants in this study had fadeback to the same shade color levels that were registered before the bleaching treatments. Vita-Easyshade spectrophotometer detected statistically significant differences at the immediately post treatment assessment, while for the other two measurement methods it was only at the 30 d evaluation that statistically significant differences were first observed.
Table 1 – Groups clinical study. Group
Whitening gel
Gel concentration
Light source
1
Zoom Whitespeed Bleaching Gel (Phillips Oral Healthcare) Zoom Whitespeed Bleaching Gel (Phillips Oral Healthcare) Boost Opalescence Xtra Boost (Ultradent)
25% HP
Whitespeed LED light (Phillips Oral Healthcare)
25% HP
No light
3
203 Effect of radiation and antioxidant on dentin-composite bonding
University of Sao Paulo, Brazil
2
e97
A. Costa 1,∗ , L. Correr-Sobrinho 1 , C.J. Soares 2 , R.M. Puppin-Rontani 1 , E.F. Soares 1 , A.B. Correr 1 , M.A.C. Sinhoreti 1 1 2
State University of Campinas, Brazil Federal University of Uberlândia, Brazil
Purpose/aim: The aim of this study was to evaluate the effect of radiotherapy and antioxidant N-acetyl cysteine (NAC) on the microtensile bond strength (TBS) of the dentincomposite interface. Materials and methods: Thirty human thirds molars were sectioned to expose middle dentin surface and distributed into 6 groups (n = 5), according to application or not of NAC for 5 s, before the adhesive Clearfil SE Bond and submission or not of 60 Gy total radiation (2 Gy daily doses, 5 days/week, for 6 weeks): G1: Control group, without radiotherapy and without application of NAC; G2: Control group, without radiotherapy and with application of NAC; G3: RestRtWt, was submitted to radiotherapy after restoration procedure without application of NAC; G4: RestRtNAC, was submitted to radiotherapy after restoration procedure with application of NAC; G5: RtRestWt was submitted to radiotherapy before restoration procedure without application of NAC; and, G6: RtRestNAC, was submitted to radiotherapy before restoration procedure with application of NAC. A block of 6 mm thickness resin composite Z250 (3M ESPE) was constructed on dentin and each 2 mm thickness was light cured for 40 s. After stored in deionized water at 37 ◦ C for 24 h, the specimens were sectioned perpendicularly to bonding area to obtain sticks with a crosssectional area of 1 mm2 , and submitted to the TBS at a crosshead speed of 0.5 mm/min. Data were submitted to two ANOVA and Tukey’s test (˛ = 0.05). Results: Bond strength values (MPa – mean ± standard deviation) for the specimens with or without application of NAC were: Control group (42.5 ± 6.3 and 49.2 ± 9.4) and Groups RestRt (49.9 ± 6.2 and 53.0 ± 1.7) were significantly higher than groups RtRest (37.7 ± 8.4 and 45.9 ± 7.3) (p < 0.05). The antioxidant NAC significantly reduced TBS compared to groups without NAC application (p < 0.05). Conclusions: The radiotherapy before composite restoration procedure decreased the TBS. The use of antioxidant NAC reduced TBS for all conditions. http://dx.doi.org/10.1016/j.dental.2016.08.204
38% HP
No light
Conclusions: Group 1 presented the highest bleaching results and color stability was registered for all the experimental groups at the 365-day period. In addition it was observed