Tooth discoloration, Dentin Sensitivity
Conditions
Interventions
Twenty patients will be randomly distributed in each of the 5 groups, not having active control once the comparison will be performed among bleaching with or without light groups. The groups are: 1) 1
2) 3 appoitments of of 20-min Violet LED application with consecutive 30-s intervals associated with 35% hydrogen peroxide
3) 3 appoitments of of 20-min Violet LED application with consecutive 30-s intervals associated with 37% carbamida peroxide
4) 3 appoitments of 35% hydrogen peroxide application for 30 minutes with no light activation
5) 3 appoitments of 37% carbamide peroxide application for 30 minutes with no light activation. Three to seven-day intervals will be done among sessions as per manufacturers instructions and data in t
Radiation
Other
Sponsors
Faculdade de Odontologia de Piracicaba
Faculdade de Odontologia de Piracicaba
Eligibility
Age
18 Years to No maximum
Inclusion criteria
Inclusion criteria: Sign Informed Consent Form; agree to not participate of any other clinical trial during this study; present good general and oral condition; have not been undergoone dental bleaching over the last 3 years or to present shade higher than A2 (vita SCALE); teeth submitted to dental bleaching with vitality; not present any edentulous space between premolars in both arches; upper right central incisor and canine must present shade higher than A2; the participant must be over 18 and under 60 years old.
Exclusion criteria
Exclusion criteria: Be participating of another clinical trial; not agree to afford for the displacement until the Dental School; present dental caries or gengivitis after clinical examination; present any allergy to one of the materials used in the clinical procedures for bleaching and mineral content analysis; not be able to attend all the appoitments necessary until the end of the treatment; patients with cracks on the teeth that will receive bleaching, once this could enhance tooth sensitivity; present upper right central incisor and canine brighter than A2; present wide restorations on the teeth that will be bleached.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Expected outcome: It is expected that color change will be higher in gel associated or not with Violet light in relation to the only-light group. However, no difference is awaited among groups with peroxide gels associated or not with the Violet LED. Difference on color alteration before and after bleaching obtained by means of a hand sprectophotometer among groups, which use different bleaching protocols. Data will be transformed in delta E values obtained using CIE*L*a*b system. | — |
Secondary
| Measure | Time frame |
|---|---|
| Expected outcome: Intensity of tooth sensitivity after bleaching protocols used in the study. It is expected that sensitivity will be more intense in the groups using hydrogen rather than carbamide peroxide. No intensification of the sensitivity is expected when the light is associated with the gel in comparison to the only-gel groups. The volunteers will mark the intensity of sensitivity during bleaching and the interval among sessions in a 0 to 10 visual analogical scale. This numbers will be used to quantify the outcomes of each group, obtaining an average for the during-session values and another one for the intervals. ;Expected outcome: do not present enamel mineral content difference among bleaching protocols. Methods: upper right premolar will be submitted to microbiopsy, which consists in the application of a demineralizing solution that will be collected and analyzed under spectrophotometry to calculate concentrations of calcium and phosphate. The values will be compared among initial and final collection, before and after bleaching respectively. ;Expected outcome: relapse of tooth color regardless the group after annual follow-ups. Methods: patients will be annually re-called to color evaluation by means of a hand spectrophotometer using CIE*L*a*B system. Delta E values will be annually compared to delta E obtained after bleaching. | — |
Countries
Brazil
Contacts
Public ContactMatheus ;Vanessa Kury Rodrigues;Cavalli Gobbo
Faculdade de Odontologia de Piracicaba;Faculdade de Odontologia de Piracicaba
Outcome results
None listed