Influence of Polishing After Bleaching on Color Change and Enamel Morphology

Study Overview
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Brief Summary
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This trial evaluated the influence of polishing on enamel color change after in-office bleaching treatment. It also evaluated the influence of polishing on tooth morphology and sensitivity.

Official Title
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Influence of Polishing After Bleaching on Color Change and Enamel Morphology: Randomized Clinical Trial

Conditions
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Tooth Discoloration, Morphologic Change, Tooth Sensitivity

Intervention / Treatment
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* Other: Hydrogen Peroxide 35%
* Other: Hydrogen Peroxide 35% + Polishing whitened teeth


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Individuals aged 18 to 30 years old of both sexes; With good oral hygiene; With no sensitivity to tactile and evaporative stimuli; Who have not undergone previous bleaching treatment, and with no caries lesions. Exclusion Criteria: patients undergoing fixed orthodontic treatment; patients allergic to the bleaching product; drug users or pregnant women; patients with carious lesions, defective restorations and/or periodontal disease, patients with systemic diseases, pulpitis or patients using analgesics.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 30 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Factorial Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: GROUP GSEM<br>In-office whitening treatment with 35% Hydrogen Peroxide | Other: Hydrogen Peroxide 35%<br>* Group that received only bleaching treatment. Soft tissue protection was performed with a Top Dam light-curing gingival barrier (FGM, Santa Catarina, SC, Brazil). Application of whitening gel (Whitness HP 35%/FGM) on the buccal surface from premolar to premolar in the upper and lower arches. Three 45-minute sessions were held with an interval of seven days between them.<br>|
| Experimental: GROUP GP<br>In-office whitening treatment with 35% Hydrogen Peroxide + Polishing of whitened teeth | Other: Hydrogen Peroxide 35% + Polishing whitened teeth<br>* Group that received only bleaching treatment followed by polishing. Soft tissue protection was performed with a Top Dam light-curing gingival barrier (FGM, Santa Catarina, SC, Brazil). Application of whitening gel (Whitness HP 35%/FGM) on the buccal surface from premolar to premolar in the upper and lower arches. Three 45-minute sessions were held with an interval of seven days between them. After bleaching, the vestibular surfaces were polished for 20s on each bleached tooth, with polishing paste and felt disc (Diamond Flex, FGM, Santa Catarina, SC, Brazil) in low rotation.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Influence of polishing on color after tooth whitening | Color evaluation was performed with the EasyshadeAdvanced spectrophotometer (Vita-Zahnfabrik, GE, Germany) | 14 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Surface morphology of whitening enamel with and without polishing | The images were obtained using a electron microscope (Mira3 model) with type electron gun, mounted on supports of aluminum with 12mm of diameter, using tape double adhesive carbon face, and metallic with Au for 2'30'' which deposits about the sample a film thick average of 10 to 15nm. The images were generated by detecting secondary electrons, using a voltage acceleration of 5 kV and a working distance of around 15 mm. | 14 days | 
| Influence of polishing on sensitivity after tooth whitening | assessment of sensitivity during treatment using a visual analogue scale with values from 0 to 10, with higher values indicating a worse level of pain. | 14 days |