Effect of Chemical and Light Bleaching Techniques on Color Change, Dentin Hypersensitivity and Patient Satisfaction

NCT07669324 | Completed

• 1 other identifier: (00A-1-25-1)
• Study Type: interventional
• Target: 30
• Locations: 1 country
• Sites: 1

Brief Summary

Aim of The Study This study aims is to evaluate color change, dentin hypersensitivity and patient satisfaction after different bleaching techniques at different time intervals. Materials(subjects)\& Methods

• Chemically activated bleaching kit.
• Light activated bleaching kit. This will be a randomized single-blind clinical trial, patients attending the faculty. Thirty-two patients will be selected for the study. Oral hygiene steps will be taken at the first visit, as well as scaling and polishing of the teeth. Patients will be divided into two groups according to the bleaching technique used. Group 1: chemical bleaching, Group 2: light activated bleaching. Color change measurements: Tooth color measurements will be performed at baseline T0, immediately after bleaching treatment T1, 1-week T2 and 1-month T3 after bleaching using a spectrophotometer. The whiteness index will be also calculated to verify the perceived bleaching effect. Dentin hypersensitivity will be evaluated at baseline D0, immediately after bleaching treatment D1, 1 week (D2) and 3 month (D3) after bleaching using Visual Analogue Scale VAS numbered from 0 (no pain) to 10 (maximum extreme pain). At the end of the study (3 months) a questionnaire was given to the patients to assess their satisfaction with bleaching treatment.

Conditions

Dentin Hypersensitivity

Keywords

chemical bleaching; light activated bleaching; dentin hypersensitivity; color change

Outcome Measures

Primary Outcomes (1)

• color change measurement

  Tooth color measurements will be performed at baseline T0, immediately after bleaching treatment T1, 1-week T2 and 1-month T3 after bleaching using a spectrophotometer. The measured values will be recorded in the units of CIELab color space. CIE L\* parameter shows the degree of lightness, a\* is indicative of redness/greenness, and b\* indicates yellowness/blueness. Variations in L\*, a\*, and b\* axes and chromatic alteration will be performed at each period and compared to baseline using the following calculation: ΔE\* = \[(ΔL\*)2 + (Δa\*)2 + (Δb\*)2\]1/2.

  three months

Secondary Outcomes (2)

• dentin hypersensitivity

  three months

• Whiteness index WID

  1 month

Study Arms (2)

light-activated bleaching

EXPERIMENTAL

bleaching procedure was conducted according to the manufacturer's instructions. Retractor was set in place, the teeth were dried by air stream, the lips were lubricated with Vaseline, a cheek retractor was placed, and isolation was achieved using cotton rolls and the gingival soft tissues were isolated by protective Liquidam (Philips, Andover, MA), Labial surfaces of the teeth 11, 12, 21, 22 were then covered with whitening gel in about 1-2mm thick layer. one 20 min session was done.protective eye wear for both patient and operator was used,d, the bleaching gel was applied, and agitated, and then light activation was used for the period of the session.

Other: Light activated bleaching

Chemically activated bleaching

EXPERIMENTAL

The bleaching procedure was conducted according to the manufacturer's instructions. Retractor was set in place, the teeth were dried by air stream, the lips were lubricated with Vaseline, a cheek retractor was placed, and isolation was achieved using cotton rolls and the gingival soft tissues were isolated by protective Liquidam (Philips, Andover, MA), Labial surfaces of the teeth 11, 12, 21, 22 were then covered with whitening gel in about 1-2mm thick layer. one 20 min session was done.the bleaching gel was applied and agitated and then left on tooth surface for the period of the session

Other: Chemically activated bleaching

Interventions

Light activated bleaching OTHER

bleaching procedure was conducted according to the manufacturer's instructions. Retractor was set in place, the teeth were dried by air stream, the lips were lubricated with Vaseline, a cheek retractor was placed, and isolation was achieved using cotton rolls and the gingival soft tissues were isolated by protective Liquidam (Philips, Andover, MA), Labial surfaces of the teeth 11, 12, 21, 22 were then covered with whitening gel in about 1-2mm thick layer. one 20 min session was done.protective eye wear for both patient and operator was used,d, the bleaching gel was applied, and agitated, and then light activation was used for the period of the session.

light-activated bleaching

Chemically activated bleaching OTHER

The bleaching procedure was conducted according to the manufacturer's instructions. Retractor was set in place, the teeth were dried by air stream, the lips were lubricated with Vaseline, a cheek retractor was placed, and isolation was achieved using cotton rolls and the gingival soft tissues were isolated by protective Liquidam (Philips, Andover, MA), Labial surfaces of the teeth 11, 12, 21, 22 were then covered with whitening gel in about 1-2mm thick layer. one 20 min session was done.the bleaching gel was applied and agitated and then left on tooth surface for the period of the session

Chemically activated bleaching

Eligibility Criteria

• Age: 18 Years - 45 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Presence of six sound maxillary anterior teeth.
• Patient having brown or yellowish stains.
• Good oral health maintained by routine brushing.
• Generalized tooth staining ranging from A2 or darker according to the value-oriented shade guide (Vita easy shade).
• Patient is willing to sign a consent form and can attend all recall visits.

You may not qualify if:

• Existing anterior crowns or any restorations on anterior teeth that will interfere with the bleaching process.
• Smoker or alcoholic patient.
• Patients suffering from active periodontal diseases and exposed roots.
• Patient who undergone previous whitening procedure.
• Pregnant and lactating women.

Sponsors & Collaborators

• Nahda University: lead

Study Sites (1)

Nahda University

Banī Suwayf, Beni Suweif Governorate, 62511, Egypt

Location

MeSH Terms

Conditions

Dentin Sensitivity

Condition Hierarchy (Ancestors)

Tooth Diseases; Stomatognathic Diseases

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Purpose: SCREENING
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: lecturer of operative dentistry

Study Record Dates

• First Submitted: February 19, 2026
• First Posted: June 25, 2026
• Study Start: February 15, 2025
• Primary Completion: April 22, 2025
• Study Completion: May 13, 2025
• Last Updated: June 25, 2026

Record last verified: 2025-01

Data Sharing

• IPD Sharing: Will not share

Locations

EG (1)