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Effects of an Experimental Propolis Gel on Tooth Sensitivity Control and Post-bleaching Color Change: a Randomized Clinical Trial

29. april 2026 opdateret af: Cecy Martins Silva, Universidade Federal do Para

Effects of a 0.5% Experimental Propolis Gel on Tooth Sensitivity Control and Post-bleaching Color Change: a Randomized Clinical Trial

This randomized, parallel, double-blind, placebo-controlled clinical study aims to investigate the effects of an experimental 0.5% propolis gel on controlling tooth sensitivity and discoloration after in-office dental bleaching. Sixty-six volunteers will be selected according to inclusion and exclusion criteria and will be randomly assigned to three experimental groups: Placebo - received application of a gel without active ingredient (K-Y Original), KF2 - received application of 5% potassium nitrate and 2% sodium fluoride (Desensitize KF 2%), and Propolis 0.5% - application of the experimental 0.5% propolis gel. All participants will undergo two in-office bleaching sessions with 35% hydrogen peroxide, with seven-day intervals between them. The bleaching agent will be applied for 30 minutes. The desensitizing agents will be applied prior to bleaching and kept in contact with the vestibular dental surface for ten minutes. Sensitivity will be monitored daily using the Visual Analogue Scale for fourteen days, while color change will be determined by spectrophotometry, using the parameters of the CIELab* system and calculation of ΔE00, measured before bleaching (T0) and 7 days after the second bleaching session (T1). The data will be subjected to statistical analysis according to sample distribution, adopting a power of 80% and a significance level of 5%.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

All groups will undergo in-office whitening treatment, carried out in 2 sessions with a 7-day interval, according to the steps described below:

Prophylaxis; Application of gingival barrier; Application of desensitizing agent or placebo, according to the established groups; Handling of the whitening material following the manufacturer's instructions: application of Whiteness HP 35% whitening gel for 30 minutes Final removal of the whitening gel and gingival barrier, followed by rinsing with water.

The application of the desensitizing agent or its placebo will follow this sequence:

Relative isolation with cotton rolls; Active application of the product on the buccal surfaces of all teeth using a rubber cup for 10 minutes; Rinsing with water.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

66

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Studiesteder

  • Brasilien
    • Pará
      • Belém, Pará, Brasilien, 66075-110
        • UFPA
        • Kontakt:
          • University F Para
          • Telefonnummer: 55(91) 3201-7390
          • E-mail: ppgo@ufpa.br

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen

Tager imod sunde frivillige

Ingen

Beskrivelse

Inclusion Criteria:

  • good oral hygiene
  • absence of active caries lesions
  • never having previous whitening therapy
  • not present dental hypersensitivity
  • don't be a smoker
  • not be pregnant
  • present at least 28 teeth in the oral cavity.

Exclusion Criteria:

  • volunteers who were under orthodontic treatment,
  • presence of periodontal disease
  • dental cracks or fractures
  • restorations and prostheses on anterior teeth
  • extensive molar restorations
  • gastroesophageal disorders
  • severe internal dental darkening
  • presence of dentinal exposure in anterior and/or posterior teeth.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Dobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Placebo komparator: Placebo- KY original gel
The Placebo group received the application of placebo gel for post tooth bleaching sensitivity.
Andet: Placebo - gel KY original
Prior to bleaching treatment with 35% hydrogen peroxide, the Placebo group received the application of a placebo gel (without active ingredient), under the same conditions described for the experimental gel.
Aktiv komparator: KF2- Potassium nitrate
The KF2 group received the application of potassium nitrate for post tooth bleaching sensitivity.
Andet: KF2- Potassium nitrate
Prior to bleaching treatment with 35% hydrogen peroxide, the dental elements of the KF2 received application of the potassium nitrate gel on the buccal surfaces of the central incisors, lateral incisors, canines and upper and lower premolars, for 10 minutes.
Eksperimentel: Propolis- Propolis 0,5% gel
The Propolis group received the application of experimental gel of propolis 0,5% for post tooth bleaching sensitivity.
Andet: Propolis gel
Prior to bleaching treatment with 35% hydrogen peroxide, the dental elements of the Propolis received application of the experimental desensitizing gel on the buccal surfaces of the central incisors, lateral incisors, canines and upper and lower premolars, for 10 minutes.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Post-whitening sensitivity assessment
Tidsramme: 14 days
To assess post-operative sensitivity, patients will be instructed to fill out a form to record daily tooth sensitivity during the 14 days of treatment, based on their individual perception of pain. This form will be handed out at each whitening session and returned to the researcher at the following session, that is, always one week after each whitening session. The assessment form will consist of a visual analogue scale (VAS). This scale consists of a 10 cm horizontal line with scores of 0 and 10 at its ends, where 0 means no sensitivity and 10 means severe tooth sensitivity. The patient will be instructed to draw a vertical line along the horizontal line of the scale, recording the intensity of tooth sensitivity per day. So that the distance in millimeters from the zero end can later be measured with the aid of a millimeter ruler, thus obtaining the patient's pain intensity level.
14 days

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Color evaluation
Tidsramme: Baseline (T0) and one week after the 2rd whitening session (T1)
The VITA Easyshade spectrophotometer (VITA Zahnfabrik, Bad Säckingen, Germany) will be used to measure the color, where the area of dental correspondence to be evaluated will be the middle third of the vestibular surface of the upper canines. To standardize the color readings, silicone matrices will be made, where the impression will be extended from canine to canine. A window will be created on the vestibular surface of each canine of the silicone guide using a metal device with a radius of 6 mm, corresponding to the diameter of the spectrophotometer tip. Thus, the tip of the device will be inserted into the silicone guide to obtain the color parameters. Subsequently, the color difference between the baseline (T0) and one week after the 2rd bleaching session (T1) will be calculated using the CIEDE2000 formulas (ΔE00).
Baseline (T0) and one week after the 2rd whitening session (T1)

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Universidade Federal do Para

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

29. april 2026

Primær færdiggørelse (Anslået)

30. december 2026

Studieafslutning (Anslået)

30. marts 2027

Datoer for studieregistrering

Først indsendt

29. april 2026

Først indsendt, der opfyldte QC-kriterier

29. april 2026

Først opslået (Faktiske)

6. maj 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

6. maj 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

29. april 2026

Sidst verificeret

1. april 2026

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 93881125.4.0000.0018

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

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Kliniske forsøg med Smerte

Kliniske forsøg med Placebo - gel KY original

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Sponsorer og samarbejdspartnere

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Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

Abonner