Objective: The study evaluated the longevity, effectiveness, sensitivity and impact on the oral health-related quality of life of in-office dental bleaching using low, medium, and high concentrate hydrogen peroxide. Material and Methods: Randomized, parallel, and double-blinded clinical trial was performed with 54 participants using18% hydrogen peroxide (HP), 20%HP, and 40%HP in-office bleaching agent. Tooth color was evaluated at baseline, after the 1st session bleaching, after the 2st session bleaching and 6 months (T5) after finishing the bleaching using spectrophotometer. Tooth sensitivity was measured with the Visual Analog Scale at baseline, immediately after bleaching, after 1 day, and after 7 days. The impact on quality of life was evaluated using the Oral Health Impact Profile (OHIP) questionnaire at baseline, and 6 months after bleaching.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
80
After the lip retractor (OptraGate, Ivoclar Vivadent, Schaan, Liechtenstein) was placed, the gingival barrier protection (Biowhiten, Biodent Ltd., İstanbul, Turkey) included in the products was applied to the upper and lower arches from premolar to premolar at the beginning of each session and removed after each treatment. The bleaching gels were applied according to the manufacturer and removed after the recommended period with a disposable surgical saliva ejector, cleaned with gauze and washed with air-water spray. Two bleaching sessions were performed at a 1-week interval. Participants were advised to maintain regular oral hygiene by brushing with toothpaste that does not contain desensitizing or whitening ingredients. HP18 is applied in 5 applications of 10 minutes per session. HP25 is applied in 3 applications of 15 minutes per session. HP40 is applied in 3 applications of 15 minutes per session.
Gazi University
Ankara, Turkey (Türkiye)
Tooth Shade evaluation
Tooth color was objectively evaluated using VitaTM Easy Shade V spectrophotometer (VITA Zanhnfabrik, BadSckingrn, Germany). The assesment was performed with daylight (10 a.m.to 2 p.m.) considering a 6 mm area situated in the middle section of the labial surface of the upper central incisors. In order to ensure consistency, alginate impressions were taken of the upper dental arches of each participant and stone molds were created. The custom trays were fabricated by using a 2mm Essix plate (Essix C; Dentsply, FL, USA) in a vacuum press machine (Ministar, Scheu, Iserlohn, Nordrhein-Westfalen Germany). 6 mm wide holes were drilled in the middle third of the buccal face of the central incisors on this trays to serve as a guide for using Easyshade V.
Time frame: baseline, immediately after the first bleaching session, immediately after the second whitening session (7 days after the first bleaching), 180 days after the first bleaching session
Tooth sensitivity evaluation
To measure tooth sensitivity, participants indicated their discomfort level using a Visual Analog Scale (VAS).23 This scale is represented by a horizontal line measuring 10 centimeters in length. The endpoint of the line labeled "no pain" represents the absence of discomfort, while the opposite endpoint labeled "worst pain" represents the highest level of discomfort.
Time frame: baseline, immediately after the first bleaching session, two hours later, and 7 days later.
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.