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Research Article
- Effect of medium or high concentrations of in-office dental bleaching gel on the human pulp response in the mandibular incisors
- Douglas Augusto Roderjan, Rodrigo Stanislawczuk, Diana Gabriela Soares, Carlos Alberto de Souza Costa, Michael Willian Favoreto, Alessandra Reis, Alessandro D. Loguercio
- Restor Dent Endod 2023;48(2):e12. Published online March 8, 2023
- DOI: https://doi.org/10.5395/rde.2023.48.e12
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Abstract
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ePub Objectives The present study evaluated the pulp response of human mandibular incisors subjected to in-office dental bleaching using gels with medium or high concentrations of hydrogen peroxide (HP).
Materials and Methods The following groups were compared: 35% HP (HP35;
n = 5) or 20% HP (HP20;n = 4). In the control group (CONT;n = 2), no dental bleaching was performed. The color change (CC) was registered at baseline and after 2 days using the Vita Classical shade guide. Tooth sensitivity (TS) was also recorded for 2 days post-bleaching. The teeth were extracted 2 days after the clinical procedure and subjected to histological analysis. The CC and overall scores for histological evaluation were evaluated by the Kruskal-Wallis and Mann-Whitney tests. The percentage of patients with TS was evaluated by the Fisher exact test (α = 0.05).Results The CC and TS of the HP35 group were significantly higher than those of the CONT group (
p < 0.05) and the HP20 group showed an intermediate response, without significant differences from either the HP35 or CONT group (p > 0.05). In both experimental groups, the coronal pulp tissue exhibited partial necrosis associated with tertiary dentin deposition. Overall, the subjacent pulp tissue exhibited a mild inflammatory response.Conclusions In-office bleaching therapies using bleaching gels with 20% or 35% HP caused similar pulp damage to the mandibular incisors, characterized by partial necrosis, tertiary dentin deposition, and mild inflammation.
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Basic Research
- Clinical assessment of whitening efficacy and safety of in-office tooth whitening system containing 15% hydrogen peroxide with or without light activation
- Young-Suk Noh, Young-Jee Rho, Yeon-Jee Yoo, Hyang-Ok Lee, Sang-Min Lim, Hyun-Jeong Kweon, Yeun Kim, Seong-Yeon Park, Hee-Young Yoon, Jung-Hyun Lee, Chan-Hee Lee, So-Ram Oh, Kee-Yeon Kum
- J Korean Acad Conserv Dent 2011;36(4):306-312. Published online July 31, 2011
- DOI: https://doi.org/10.5395/JKACD.2011.36.4.306
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Abstract
PDFPubReaderePub
Objectives This clinical study evaluated the effect of light activation on the whitening efficacy and safety of in-office bleaching system containing 15% hydrogen peroxide gel.
Materials and Methods Thirty-three volunteers were randomly treated with (n = 17, experimental group) or without light activation (n = 16, control group), using Zoom2 white gel (15% H2O2, Discus Dental) for a total treatment time of 45 min. Visual and instrumental color measurements were obtained using Vitapan Classical shade guide and Shadepilot (DeguDent) at screening test, after bleaching, and 1 month and 3 month after bleaching. Data were analyzed using
t -test, repeated measure ANOVA, and chi-squared test.Results Zoom2 white gel produced significant shade changes in both experimental and control group when pre-treatment shade was compared with that after bleaching. However, shade difference between two groups was not statistically significant (
p > 0.05). Tooth shade relapse was not detected at 3 months after bleaching. The incidence of transient tooth sensitivity was 39.4%, with being no differences between two groups.Conclusions The application of light activation with Zoom2 white gel system neither achieved additional whitening effects nor showed more detrimental influences.
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Original Article
- The effectiveness of sealing technique on in-office bleaching
- Yoon Lee, So-Ran Kwon, Jeong-Won Park
- J Korean Acad Conserv Dent 2008;33(5):463-471. Published online September 30, 2008
- DOI: https://doi.org/10.5395/JKACD.2008.33.5.463
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Abstract
PDFPubReaderePub
This study investigated the clinical effectiveness and safety of sealed bleaching compared to conventional in-office bleaching using a randomized clinical trial of split arch design. Ten participants received a chairside bleaching treatment on the upper anterior teeth, and each side was randomly designated as sealed or control side. A mixture of Brite powder (PacDent, Walnut, USA), 3% hydrogen peroxide and carbamide peroxide (KoolWhite, PacDent, Walnut, USA) were used as bleaching agent. The control side was unwrapped and the experimental side was covered with a linear low density polyethylene (LLDPE) wrap for sealed bleaching. The bleaching gel was light activated for 1 hour. The tooth shades were evaluated before treatment, after treatment, and at one week check up by means of a visual shade (VS) assessment using a value oriented shade guide and a computer assisted shade assessment using a spectrophotometer (SP). The data were analyzed by paired t-test.
In the control and sealed groups, the visual shade scores after bleaching treatment and at check up showed statistically significant difference from the preoperative shade scores (p < .05). The shade scores of the sealed group were significantly lighter than the control immediately after bleaching and at the check-up appointment (p < 0.05). Compared to prebleaching status, the ΔE values at post-bleaching condition were 4.35 ± 1.38 and 5.08 ± 1.34 for the control and sealed groups, respectively. The ΔE values at check up were 3.73 ± 1.95 and 4.38 ± 2.08 for the control and sealed groups. ΔE values were greater for the sealed group both after bleaching (p < .05) and at check up (p < .05).
In conclusion, both ΔE and shade score changes were greater for the sealed bleaching group than the conventional bleaching group, effectively demonstrating the improvement of effectiveness through sealing.
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