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Contribution of a* to Dental Bleaching After Combined Dental Bleaching
Contribution of the a* Parameter to Dental Bleaching After Combined Bleaching: A Prospective Non-randomized Single-arm Interventional Clinical Study
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Gedetailleerde beschrijving
Tooth whitening is one of the most commonly requested aesthetic dental treatments, requiring objective and reproducible methods to quantify color changes. The CIELab color system (L*, a*, b*) and the Whiteness Index for Dentistry (WID) are widely used for this purpose.
While increases in L* and decreases in b* are recognized as the main contributors to dental whitening, the role of the a* parameter remains unclear. Variations in a*, including the presence of negative values or changes in sign during treatment, have been insufficiently studied.
A prospective, non-randomized, single-arm interventional clinical study with a before-after design will be conducted to evaluate changes in L*, a*, b*, and WID following a combined dental bleaching protocol consisting of an in-office phase with hydrogen peroxide and an at-home phase with carbamide peroxide.
Spectrophotometric measurements will be performed at baseline, after the in-office phase, and after completion of the at-home phase. The study will also analyze the relationship between changes in CIELab parameters and WID.
The study will be conducted in accordance with ethical standards and will be approved by the corresponding institutional review board. All participants will provide written informed consent prior to inclusion.
Studietype
Inschrijving (Geschat)
Fase
- Niet toepasbaar
Contacten en locaties
Studiecontact
- Naam: José Amengual-Lorenzo, PhD
- Telefoonnummer: +34616941167
- E-mail: jose.amengual@uv.es
Studie Contact Back-up
- Naam: Rubén Agustín Panadero, MSc; Phd
- Telefoonnummer: +34653098901
- E-mail: ruben.agustin@uv.es
Studie Locaties
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Valencia
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Valencia, Valencia, Spanje, 46010
- University of Valencia
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Contact:
- José Amengual Lorenzo, Phd
- Telefoonnummer: +34616941167
- E-mail: jose.amengual@uv.es
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Contact:
- Rubén Agustín-Panader, MsC; PhD
- Telefoonnummer: +34653098901
- E-mail: ruben.agustin@uv.es
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Hoofdonderzoeker:
- José Amengual-Lorenzo, PhD
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
- Volwassen
- Oudere volwassene
Accepteert gezonde vrijwilligers
Beschrijving
Inclusion Criteria
- Age 18 to 65 years
- Good oral health
- Presence of natural anterior teeth (incisors, canines, premolars)
- Anterior teeth without restorations
- Indication for tooth bleaching treatment
- Ability to comply with study procedures and visits
Exclusion Criteria
- Smoking
- Previous tooth bleaching treatment
- Pregnancy
- Breastfeeding
- Restorations in anterior teeth
- Presence of diseases affecting tooth color
- Conditions that may interfere with study outcomes
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Behandeling
- Toewijzing: NVT
- Interventioneel model: Opdracht voor een enkele groep
- Masker: Geen (open label)
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
|---|---|
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Experimenteel: Combined Dental Bleaching
Participants will undergo a combined dental bleaching treatment consisting of an in-office phase followed by an at-home phase using custom trays.
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The intervention consists of an in-office bleaching phase with two 20-minute applications of 40% hydrogen peroxide, followed by an at-home bleaching phase using 16% carbamide peroxide applied with custom trays for 90 minutes daily.
Treatment will continue until color stabilization is achieved, defined as a change in WID of less than 2.6 units between two consecutive weekly measurements.
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Change in Whiteness Index for Dentistry (WID)
Tijdsspanne: From baseline to end of treatment (up to 12 weeks).
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Change in WID values calculated from CIELab parameters (L*, a*, b*) between baseline and the end of treatment (up to 12 weeks).
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From baseline to end of treatment (up to 12 weeks).
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Change in L* parameter
Tijdsspanne: Baseline to end of treatment (up to 12 weeks).
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Difference in L* values between baseline and the end of treatment (up to 12 weeks) measured using spectrophotometry.
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Baseline to end of treatment (up to 12 weeks).
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Change in a* parameter
Tijdsspanne: Baseline to end of treatment (up to 12 weeks).
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Difference in a* values between baseline and the end of treatment (up to 12 weeks), including assessment of sign changes.
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Baseline to end of treatment (up to 12 weeks).
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Change in b* parameter
Tijdsspanne: Baseline to end of treatment (up to 12 weeks)
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Difference in b* values between baseline and the end of treatment (up to 12 weeks), measured using spectrophotometry.
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Baseline to end of treatment (up to 12 weeks)
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Correlation between WID and CIELab parameters
Tijdsspanne: At end of treatment (up to 12 weeks).
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Assessment of the relationship between changes in WID and changes in L*, a*, and b*.
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At end of treatment (up to 12 weeks).
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Medewerkers en onderzoekers
Sponsor
Onderzoekers
- Hoofdonderzoeker: José Amengual-Lorenzo, University of Valencia
Publicaties en nuttige links
Studie record data
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Studieregistratiedata
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Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Andere studie-ID-nummers
- Bleaching_aStar_WID_2026
- Application Reference 2026-ODO (Andere identificatie: Ethics Committee University of Valencia)
Plan Individuele Deelnemersgegevens (IPD)
Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?
Beschrijving IPD-plan
Informatie over medicijnen en apparaten, studiedocumenten
Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel
Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct
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