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Peer-Review Record

Influence of a Bleaching Agent on the Color Stability of Indirect Composite Resins Immersed in Dyes

Ceramics 2019, 2(2), 235-245; https://doi.org/10.3390/ceramics2020019
Reviewer 1: Anonymous
Reviewer 2: Jane Manakil
Reviewer 3: Anonymous
Ceramics 2019, 2(2), 235-245; https://doi.org/10.3390/ceramics2020019
Received: 31 January 2019 / Revised: 25 March 2019 / Accepted: 26 March 2019 / Published: 1 April 2019

Round 1

Reviewer 1 Report

Clinically, to apply 3 cycles of bleaching agent (1 every week for 3 weeks) on composite surfaces to improve aesthetic effect, is very difficoult to achieve because the costs of this procedure.  

On the other hand, It is appreciable the quality of the analyses. 

Best Regards


Author Response

English language and style: I don't feel qualified to judge about the English language and style 

Response: The English was reviewed by a native English speaker. We are willing to make further modifications and corrections, if necessary.

 

Does the introduction provide sufficient background and include all relevant references? Must be improved.

Response: The Introduction was improved in the fourth pragraph: "Different substances can be used as a bleaching agent, such as carbamide peroxide and hydrogen peroxide. For an in-office application, Opalescence Xtra Boost is a hydrogen peroxide gel with a chemical activation that has a neutral pH, and can be used efficiently, safely, and provides appropriate results in a short period of time."

 

Clinically, to apply 3 cycles of bleaching agent (1 every week for 3 weeks) on composite surfaces to improve aesthetic effect is very difficult to achieve because the costs of this procedure.

On the other hand, it is appreciable the quality of the analyses.

Response: We respect the comment of the reviewer and appreciate their insight. We believe that the whitening need (re-treatment) is not frequently performed in the office. This procedure is often performed every 3 to 4 years or more in a patient, being predictable and stable. In this way, the cost of its realization would not be impracticable since it is not frequent. On the contrary, it is a low-cost alternative, when compared to the need of replacement of the restorations with altered color, for example. 


Reviewer 2 Report

Influence of a Bleaching Agent on Color Stability of Indirect Composite Resins Immersed in Dyes , this study has significant clinical application. But as mentioned the in vivo study is of great concern.

 Some studies have mentioned Carbamide peroxide,   with increased exposure time seems to have a greater influence and is most effective than higher concentration of hydrogen peroxide.

So, this can be another stretch of the study


Author Response

English language and style: English language and style are fine/minor spell check required 

Response: The English was reviewed by a native English speaker. We are willing to make further modifications and corrections, if necessary.

 

This study has significant clinical application. But as mentioned the in vivo study is of great concern. Some studies have mentioned Carbamide peroxide, with increased exposure time seems to have a greater influence and is most effective than higher concentration of hydrogen peroxide. So, this can be another stretch of the study.

Response: We respect the comment of the reviewer and appreciate their insight. We believe that the carbamide peroxide is a suitable alternative for a bleaching, and related information has been inserted in the Introduction section. However, we believe that the hydrogen peroxide provides faster satisfactory results (only 30 minutes per application in office) and is more practical for the patient. In general, the carbamide peroxide requires applications of more than 2 hours and is used in a home environment, without a direct supervision of the professional. However, we agree with the reviewer that the study of this substance may be an alternative route for future studies.


Reviewer 3 Report

Introduction part is too short.

Please provide more clear and reader friendly graphs (Fig. 1-5).

Tables are difficult to read.

Please show the pictures of the samples.

Please add "Tea" for discussion part.


Author Response

English language and style: English language and style are fine/minor spell check required 

Response: The English was reviewed by a native English speaker. We are willing to make further modifications and corrections, if necessary.

 

Is the research design appropriate? Are the methods adequately described? Are the results clearly presented? Are the conclusions supported by the results?

Can be improved.

Response: Alterations were made in the Materials and Methods, Results and Discussion sections.

 

Introduction part is too short.

Response: The Introduction was improved in the fourth pragraph: "Different substances can be used as a bleaching agent, such as carbamide peroxide and hydrogen peroxide. For an in-office application, Opalescence Xtra Boost is a hydrogen peroxide gel with a chemical activation that has a neutral pH, and can be used efficiently, safely, and provides appropriate results in a short period of time."

 

Please provide more clear and reader friendly graphs (Fig. 1-5)

Response: The Figures were altered. We are willing to make further modifications and corrections, if necessary.

 

Tables are difficult to read

Response: Tables were revised and adjusted for a better understanding. Table 1 was reduced. Table 5 was divided in Tables 5 to 9 to make it easier to read.

 

Please show the pictures of the samples

Response: The Figure of the samples was added.

 

Please add "Tea" for discussion part

Response: A section about "Tea" was added in the Discussion section: "Several studies have also demonstrated a staining potential of the tea, with greater pigmentation than coffee and grape juice, for example. The color alteration is a result of teaflavins presented in tea leaves, which cause a yellowish-brown staining. Therefore, this staining solution should be evaluated in further studies for a better understanding of its behavior."


Round 2

Reviewer 1 Report

I'm gratefull with the authors for the modifications about their paper. The study is well designed but it's my opinion to add a clinical implication section to make easily its applicability on common practice. 

Author Response

I'm gratefull with the authors for the modifications about their paper. The study is well designed but it's my opinion to add a clinical implication section to make easily its applicability on common practice. 

Response: The clinical implication of the study was added in the Discussion section: "In the present study, a challenge was performed, which consisted in periods of exposition to solutions intercalated to periods of exposition in saliva, simulating with a higher accuracy oral conditions. The clinical implication of this study is that a greater color alteration was observed in ΔE1, independent of color solution, indicating extrinsic pigmentation. The Resilab group exhibited greater values of ΔE1 when compared to other resins. The 38% hydrogen peroxide-based bleaching agent was effectively bleached the surface of the materials studied. Therefore, these findings are important to patients and can help scientists and professionals in their daily clinic."


Reviewer 3 Report

Thank you for the modification. The article was much improved.

However, as I pointed out, you should show the pictures of each samples which readers can understand the surface color changes. In the reply you only show the picture of a resin block.

And in M&M, you put the codes for the each period (like L0 to L4). However L2 to L4 are in same situation (after bleeching), L0 and L1 are different. So please put the different codes for them. 

For the names of material, the company's name are wrong. 3M ESPE is now 3M, and Kuraray Medical is Kuraray Noritake Dental.

Author Response

Thank you for the modification. The article was much improved.

However, as I pointed out, you should show the pictures of each samples which readers can understand the surface color changes. In the reply you only show the picture of a resin block.

Response: We respect the comment of the reviewer and appreciate their insight. Unfortunately, we do not have a picture of the samples with color change. We apologize for the incident and are willing to make further changes if necessary.

 

And in M&M, you put the codes for the each period (like L0 to L4). However L2 to L4 are in same situation (after bleeching), L0 and L1 are different. So please put the different codes for them. 

Response: We respect the comment of the reviewer. However, we would like to state that L2 to L4 are not in same situation since the day of analysis was different:

L0 - initial

L1 - after 21 days of immersion in the color solutions

L2 - after 7 days of immersion in the bleaching agent

L3 - after 14 days of immersion in the bleaching agent

L4 - after 21 days of immersion in the bleaching agent

Therefore, the sentence was changed in the Materials and Methods section to avoid misunderstanding: "The readings of the color alteration were performed in the following periods: initial (L0), after 21 days of immersion in the color solutions (ΔE1 and L1), after 7 of immersion in the bleaching agent (ΔE2 and L2), after 14 of immersion in the bleaching agent (ΔE3 and L3) and after 21 days of immersion in the bleaching agent (ΔE4 and L4)."

 

For the names of material, the company's name are wrong. 3M ESPE is now 3M, and Kuraray Medical is Kuraray Noritake Dental.

Response: The terms were changed. 


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