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1.
Ned Tijdschr Tandheelkd ; 127(7-08): 402-405, 2020.
Artículo en Holandés | MEDLINE | ID: mdl-32840494

RESUMEN

Activated charcoal-based whitening dentifrices claim to whiten teeth. Scientific evidence for the actual whitening effect, however, is still limited. A search in PubMed shows one randomized controlled double blinded in vitro study in which the'Black is White Curaprox® dentifrice is less effective in reducing extrinsic staining than other whitening dentifrices. One systematic literature review and one review article concluded there is insufficient scientific evidence to substantiate the cosmetic benefits of charcoal-based dentifrices.


Asunto(s)
Dentífricos , Blanqueamiento de Dientes , Decoloración de Dientes , Humanos , Dióxido de Silicio , Fluoruro de Sodio
2.
Stomatologiia (Mosk) ; 99(3): 11-17, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-32608942

RESUMEN

The aim of the study was to study clinical and histological changes in the treatment of discoloration using different systems for professional tooth whitening. The study involved 76 patients. Patients of group 1 had their teeth whitened by the Amazing White Universal Extra photochemical activation system, and group 2 had their teeth whitened by the Beyond Polus system. Each group was divided into 3 more subgroups depending on the method of remineralization and the applied toothpaste (SENSITIVE ULTRA and SENSODYNE Rapid Relief). To assess teeth hyperesthesia before, immediately after and 14 days after the bleaching procedure, we used the prevalence index of teeth hyperesthesia, the intensity index of teeth hyperesthesia, and the Schiff sample. We also used a digital rating scale for patients. 100 teeth extracted for orthodontic indications were subjected to histological examination. The occurrence of hyperesthesia of teeth during professional bleaching was revealed in 100% of cases. Significant structural changes were registered in the enamel and dentin of the teeth, most pronounced during photo-whitening. The treatment based on zinc-substituted hydroxyapatite carbonate in combination with laserophonophoresis against the background of use the toothpaste SENSODYNE Rapid Relief had the greatest remineralizing effect.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Diente , Esmalte Dental , Humanos , Pastas de Dientes
3.
Stomatologiia (Mosk) ; 99(3): 27-31, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-32608945

RESUMEN

THE AIM: Clinical analysis of the effectiveness of photodynamic tooth whitening according to the spectrophotometric method. MATERIAL AND METHODS: Photodynamic tooth whitening was performed in 35 patients aged 20-45 years, on the teeth of the frontal group. To record the optical characteristics of enamel, the spectrophotomerism method was used. RESULTS: The study reliably shows that the average change in color saturation «C¼ ranged from 0.5 to 2 units. The optical characteristic of luminosity "L" before and after photodynamic exposure remained within the limits of healthy enamel, and the optical characteristic of whiteness on the scale of whitened teeth was 2 units. CONCLUSION: The method of photodynamic therapy can be used in dental practice to conduct a teeth whitening procedure.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Diente , Adulto , Color , Esmalte Dental , Humanos , Persona de Mediana Edad , Espectrofotometría , Adulto Joven
4.
Braz Dent J ; 31(3): 236-243, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32667516

RESUMEN

This study aimed to quantify the penetration of hydrogen peroxide, color change evaluation, surface morphology, and composition after application of desensitizing agents before in-office bleaching. Fifty premolars were sectioned, an acetate buffer was placed in the pulp chamber and divided into five groups (n=10). In the positive control group, only the in-office bleaching gel was used, and in the negative control group, no treatment was used. Three different desensitizing agents were applied: Desensibilize KF2%® group; Mi Paste® group, and Desensibilize Nano-P® group. The bleaching procedure was carried out with 35% HP. The absorbance of the resulting solution was determined in a spectrophotometer. Color change was assessed by using a digital spectrophotometer. Four additional premolars were assigned to the same groups above for analysis under scanning electron microscope, as well as to evaluate the elemental composition with X-ray dispersive energy spectrometry. Data were subjected to ANOVA and Tukey's test (α=0.05). All products reduced the penetration of HP in the pulp chamber. Mi Paste and Nano P were the products that yielded the lowest HP penetration, which was similar to the negative control group (p<0.001). No significant difference was detected in color change (p<0.001). Concerning enamel morphology, the groups that were analyzed after bleaching were observed a greater deposition of desensitizing agents on the surface. The use of desensitizing agents before tooth bleaching seems to be an alternative to reduce adverse effects of the tooth.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Esmalte Dental , Cavidad Pulpar , Peróxido de Hidrógeno
5.
Braz Dent J ; 31(3): 221-235, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32667517

RESUMEN

There is an increased accessibility of over-the-counter (OTC) whitening agents with very little data in the literature regarding their effectiveness. This review was done to determine their effectiveness of the predominant OTC whitening agents from 2006 until 2018 where a comparison of each agent was made with a placebo, no treatment or with other OTC whitening agents. The major categories of OTC whitening agents such as dentifrices, whitening strips and paint on gels. Dentist prescribed bleaching applied at home and in-office bleaching studies and studies that demonstrated whitening products to participants were excluded. Articles were searched for in the databases of Medline (Ovid), PubMed, the Cochrane Library and Cochrane Central Register of Controlled Trials. Twenty-four articles were included in the systematic review and the quality of studies was determined by the GRADE (Grading of Recommendations, Assessment, Development and Evaluations) ranking criteria. Compared to other OTC, strips are reported to be effective. Two studies determined whitening strips to be effective. Whitening strips have been shown to be effective when compared with placebos and other OTC whitening agents. Dentifrices are effective in changing the shade of the tooth "by removing extrinsic stains" when compared to a placebo and non-whitening dentifrices, but they are not as effective in comparison to whitening strips. There is a lack of evidence with regards to the effectiveness of paint-on gels. While there is some evidence that OTC can alter shade in the short term, there is a need for better-designed studies.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Decoloración de Dientes , Peróxido de Carbamida , Humanos , Urea
6.
J Contemp Dent Pract ; 21(5): 481-485, 2020 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-32690827

RESUMEN

AIM: To evaluate the effect of two antioxidant formulations (sodium ascorbate and α-tocopherol) on fracture resistance of endodontically treated teeth. MATERIALS AND METHODS: Sixty human premolars were endodontically treated and divided into six groups (n = 10): G1 (negative control)-unbleached and restored with composite resin; G2 (positive control)-bleached in three sessions, using hydrogen peroxide (15 H2O2) plus titanium dioxide (TiO2) nanoparticles, photoactivated by LED laser system and restored with composite resin; G3-bleaching similar to G2, after the use of 10% sodium ascorbate gel for 24 hours and restored with composite resin; G4-similar to G3, but with the use of 10% sodium ascorbate solution and restored with composite resin; G5 and G6-similar to G3, but with the use of 10% α-tocopherol in alcohol or carbopol, respectively, and was also restored. A mechanical fracture resistance test was performed and the Kruskal-Wallis test was used to evaluate the results (α = 0.05). RESULTS: No statistical difference was observed in fracture resistance between groups (p > 0.05). Regarding the antioxidant and pharmaceutical formulation applied, no statistical difference was detected in any comparison (p > 0.05). The frequency of fractures considered favorable was higher in G1 and G3 compared to the other groups. CONCLUSION: The endodontically treated teeth bleached with 15 H2O2 plus TiO2 nanoparticles and photoactivated with the LED laser did not decrease the fracture resistance and the use of sodium ascorbate or α-tocopherol did not increase the crown fracture resistance. CLINICAL SIGNIFICANCE: The literature reports a significant reduction in the bond strength of restorations on the bleached dentin. Therefore, the use of antioxidant agents may have a promising effect on fracture resistance of endodontically treated teeth.


Asunto(s)
Blanqueamiento de Dientes , alfa-Tocoferol , Antioxidantes , Ácido Ascórbico , Resinas Compuestas , Humanos , Peróxido de Hidrógeno
7.
J Appl Oral Sci ; 28: e20190384, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32520077

RESUMEN

OBJECTIVES: This study evaluated if the use of a bioactive glass-ceramic-based gel, named Biosilicate (BS), before, after or mixed with bleaching gel, could influence the inflammation of the dental pulp tissue of rats' molars undergoing dental bleaching with hydrogen peroxide (H2O2). METHODOLOGY: The upper molars of Wistar rats (Rattus norvegicus, albinus) were divided into Ble: bleached (35% H2O2, 30-min); Ble-BS: bleached and followed by BS-based gel application (20 min); BS-Ble: BS-based gel application and then bleaching; BS/7d-Ble: BS-based gel applications for 7 days and then bleaching; Ble+BS: blend of H2O2 with BS-based gel (1:1, 30-min); and control: placebo gel. After 2 and 30 days (n=10), the rats were euthanized for histological evaluation. The Kruskal-Wallis and Dunn statistical tests were performed (P<0.05). RESULTS: At 2 days, the Ble and Ble-BS groups had significant alterations in the pulp tissue, with an area of necrosis. The groups with the application of BS-based gel before H2O2 had moderate inflammation and partial disorganization in the occlusal third of the coronary pulp and were significantly different from the Ble in the middle and cervical thirds (P<0.05). The most favorable results were observed in the Ble+BS, which was similar to the control in all thirds of the coronary pulp (P>0.05). At 30 days, the pulp tissue was organized and the bleached groups presented tertiary dentin deposition. The Ble group had the highest deposition of tertiary dentin, followed by the Ble-BS, and both were different from control (P<0.05). CONCLUSION: A single BS-based gel application beforehand or BS-based gel blended with a bleaching gel minimize the pulp damage induced by dental bleaching.


Asunto(s)
Pulpa Dental/efectos de los fármacos , Vidrio/química , Peróxido de Hidrógeno/química , Pulpitis/prevención & control , Blanqueadores Dentales/química , Blanqueamiento de Dientes/métodos , Animales , Pulpa Dental/patología , Peróxido de Hidrógeno/efectos adversos , Masculino , Diente Molar , Pulpitis/inducido químicamente , Pulpitis/patología , Distribución Aleatoria , Ratas Wistar , Reproducibilidad de los Resultados , Factores de Tiempo , Blanqueamiento de Dientes/efectos adversos , Blanqueadores Dentales/efectos adversos , Resultado del Tratamiento
8.
J Evid Based Dent Pract ; 20(2): 101406, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32473797

RESUMEN

OBJECTIVE: To evaluate if the topical application of 10% potassium nitrate applied before in-office bleaching is effective to reduce the risk and intensity of tooth sensitivity (TS), as well as to evaluate if its application can jeopardize color change. MATERIALS AND METHODS: A randomized, split-mouth triple-blind clinical trial was conducted on 43 young patients with incisors A2 or darker. Half of the patient's upper arch received either the application of a 10% potassium nitrate or placebo gel for 10 min in a university setting. In-office bleaching was performed in three 15-min applications in two clinical sessions (1-week interval) using 35% hydrogen peroxide. Risk and intensity of TS was recorded with a 0-4 Numeric Rating Scale and a 0-10 Visual Analogue Scale during bleaching, 1 hour, 24 hours, and 48 hours after bleaching. Color was evaluated before and 1 month after bleaching with shade guides (Vita Classical and Vita Bleachedguide) and a spectrophotometer. The risk of TS (McNemar's test) and intensity of TS (Wilcoxon signed-rank for Numeric Rating Scale and paired t-test for Visual Analogue Scale) were statistically evaluated. Color change was compared using paired t-test. Significant level was set at 5%. RESULTS: No significant difference was observed in the absolute risks of TS between groups (RR = 1.11; 95% CI 0.97 to 1.27; P = .12), which exceeded 87% for both groups. Similarly, no difference in TS intensities was detected (P > .05). Significant whitening was observed with all color measurement instruments with no difference between groups (P > .05). CONCLUSION: The topical application of 10% potassium nitrate, before in-office bleaching, did not reduce the risk and intensity of TS and did not jeopardize color change.


Asunto(s)
Sensibilidad de la Dentina , Blanqueadores Dentales , Blanqueamiento de Dientes , Humanos , Nitratos , Compuestos de Potasio , Resultado del Tratamiento
9.
Swiss Dent J ; 130(6): 493-501, 2020 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-32512985

RESUMEN

This study aimed to evaluate the efficacy and complications of several bleaching methods in patients with discolored teeth after orthodontic treatment. This randomized clinical trial involved 60 volunteers (31 women, 29 men) aged 14 to 30 years, who finished fixed orthodontic therapy at least three months before the study commencement and complained of discoloration on upper front teeth. The subjects were divided into four groups by treatment. The patients in group 1 received home bleaching, whereas those in groups 2 to 4 underwent in-office bleaching using a diode laser, a plasma arc and no light source, respectively. Tooth color was measured at baseline, one hour after the end of the bleaching procedure, and one week later, and the color alteration between different stages was compared among the groups. The severity of tooth sensitivity and the occurrence of other post-treatment complications were recorded. The color change between baseline and one week after treatment was greatest in the home-bleaching and the laser-assisted bleaching groups, and lowest in the plasma-arc bleaching group, although the difference between the groups was not significant (p > 0.05). Tooth sensitivity over 24 hours after bleaching was lowest in subjects who had undergone laser-assisted bleaching and highest in those who had received in-office bleaching without light (p < 0.05). All methods were effective in managing tooth discoloration after orthodontic treatment. Home bleaching produced favorable color alteration. Amongst the in-office approaches, laser-assisted bleaching should be considered as the best option, as it produced effective results with lowest tooth sensitivity and over a shorter period of time.


Asunto(s)
Sensibilidad de la Dentina , Blanqueamiento de Dientes , Decoloración de Dientes , Diente , Adolescente , Adulto , Femenino , Humanos , Peróxido de Hidrógeno , Masculino , Adulto Joven
10.
Oral Health Prev Dent ; 18(3): 549-554, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32515427

RESUMEN

PURPOSE: Resin infiltration may be a barrier for bleaching gels. The aim of this study was to compare dental bleaching effectiveness using low-concentration gels on heavily or mildly stained teeth that were or were not treated with resin infiltration agents. MATERIALS AND METHODS: Forty bovine enamel surfaces were submitted to demineralisation, after which two staining protocols were performed. Twenty specimens were immersed in a staining broth for 24 h (Lab 1) or 7 days (Lab 2). Ten specimens of each group received resin infiltrant application following the manufacturer's recommendation. All specimens were bleached using 15% carbamide peroxide gel for 14 days (8 h daily). Colour measurement was performed using a reflectance spectrophotometer at three time points: baseline, after staining, and after bleaching. Data (CIEDE00) were analysed using Student's t-test (p < 0.05). RESULTS: No statistically significant differences were observed in Lab 1 (p = 0.560). For Lab 2, statistically significant differences were detected (p = 0.031). Once bleaching was achieved to some degree (Lab 2), the resin infiltrant may have behaved as a semipermeable barrier to the carbamide peroxide gels. CONCLUSION: Bleaching treatment was effective on mildly pigmented tooth surfaces. On the other hand, in comparison to the control group, the heavily pigmented surfaces bleached less in the presence of the resin infiltrant, possibly due to the lack of free radicals penetrating into the substrate.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Decoloración de Dientes , Animales , Peróxido de Carbamida , Bovinos , Esmalte Dental , Combinación de Medicamentos , Humanos , Resinas de Plantas
11.
J Appl Oral Sci ; 28: e20190720, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32428059

RESUMEN

Objective This study evaluated the clinical effect of violet LED light on in-office bleaching used alone or combined with 37% carbamide peroxide (CP) or 35% hydrogen peroxide (HP). Methodology A total of 100 patients were divided into five groups (n=20): LED, LED/CP, CP, LED/HP and HP. Colorimetric evaluation was performed using a spectrophotometer (ΔE, ΔL, Δa, Δb) and a visual shade guide (ΔSGU). Calcium (Ca)/phosphorous (P) ratio was quantified in the enamel microbiopsies. Measurements were performed at baseline (T 0 ), after bleaching (T B ) and in the 14-day follow-up (T 14 ). At each bleaching session, a visual scale determined the absolute risk (AR) and intensity of tooth sensitivity (TS). Data were evaluated by one-way (ΔE, Δa, ΔL, Δb), two-way repeated measures ANOVA (Ca/P ratio), and Tukey post-hoc tests. ΔSGU and TS were evaluated by Kruskal-Wallis and Mann-Whitney, and AR by Chi-Squared tests (a=5%). Results LED produced the lowest ΔE (p<0.05), but LED/HP promoted greater ΔE, ΔSGU and Δb (T 14 ) than HP (p<0.05). No differences were observed in ΔE and ΔSGU for LED/CP and HP groups (p>0.05). ΔL and Δa were not influenced by LED activation. After bleaching, LED/CP exhibited greater Δb than CP (p>0.05), but no differences were found between these groups at T 14 (p>0.05). LED treatment promoted the lowest risk of TS (16%), while HP promoted the highest (94.4%) (p<0.05). No statistical differences of risk of TS were found for CP (44%), LED/CP (61%) and LED/HP (88%) groups (p>0.05). No differences were found in enamel Ca/P ratio among treatments, regardless of evaluation times. Conclusions Violet LED alone produced the lowest bleaching effect, but enhanced HP bleaching results. Patients treated with LED/CP reached the same efficacy of HP, with reduced risk and intensity of tooth sensitivity and none of the bleaching protocols adversely affected enamel mineral content.


Asunto(s)
Peróxido de Carbamida/administración & dosificación , Peróxido de Hidrógeno/administración & dosificación , Luz , Fototerapia/métodos , Blanqueadores Dentales/administración & dosificación , Blanqueamiento de Dientes/métodos , Adolescente , Adulto , Análisis de Varianza , Colorimetría , Terapia Combinada , Esmalte Dental/efectos de los fármacos , Esmalte Dental/efectos de la radiación , Sensibilidad de la Dentina/inducido químicamente , Femenino , Humanos , Masculino , Valores de Referencia , Factores de Riesgo , Espectrofotometría , Estadísticas no Paramétricas , Propiedades de Superficie/efectos de los fármacos , Propiedades de Superficie/efectos de la radiación , Resultado del Tratamiento , Adulto Joven
12.
Oper Dent ; 45(3): 265-275, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32396502

RESUMEN

OBJECTIVE: The aim of this systematic review and meta-analysis was to evaluate a high concentration of hydrogen peroxide (35%) regarding tooth sensitivity and color change in tooth bleaching in comparison to low concentrations (6% to 20%). METHODS AND MATERIALS: This review was conducted using the criteria of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses and is registered on the Prospective Register of Systematic Reviews (CRD42017064493). The PICO question was "Does a concentration of hydrogen peroxide ≥35% using in-office bleaching procedure contribute to greater tooth sensitivity?" A search was made in PubMed/MEDLINE, Scopus, and the Cochrane Library. RESULTS: Fourteen studies were selected for the qualitative analysis and seven for quantitative analysis. A total of 649 patients were evaluated (mean age: 36.32 years; range: 13.9 to 31 years), and the follow-up period ranged from one week to 12 months. The meta-analysis demonstrated that tooth sensitivity was higher in the patients submitted to treatment involving a high concentration of hydrogen peroxide (0.67; 95% confidence interval [CI]: 0.44 to 1.03; p=0.04; I 2 : 56%), and a significant difference was found regarding objective color ΔE (1.53; 95% CI: 2.99 to 0.08; p<0.0001; I 2 : 82%) but no significant difference was found regarding subjective color ΔSGU (0.24; CI: 0.75 to 1.23; p<0.00001; I 2 : 89%). CONCLUSIONS: This study indicated that a lower concentration of hydrogen peroxide causes less tooth sensitivity and better effectiveness in objective color change (ΔE); however, there is no difference between them related to subjective color (ΔSGU).


Asunto(s)
Sensibilidad de la Dentina , Blanqueadores Dentales , Blanqueamiento de Dientes , Preescolar , Color , Humanos , Peróxido de Hidrógeno , Lactante , Resultado del Tratamiento
13.
J Contemp Dent Pract ; 21(2): 140-147, 2020 Feb 01.
Artículo en Inglés | MEDLINE | ID: mdl-32381817

RESUMEN

AIM: The aim of this study was to evaluate the effects of different concentrations of sodium ascorbate (SA), green tea (GT), and chamomile (CM) on the shear bond strength (SBS) of metal orthodontic brackets bonded to teeth bleached with 40% hydrogen peroxide (HP). MATERIALS AND METHODS: Ninety-four sound premolars were divided into eight groups: group I (control + no bleaching), group II (bleaching + immediate bonding), group III (bleaching + 10% SA), group IV (bleaching + 35% SA), group V (bleaching + 0.5% GT), group VI (bleaching + 1% GT), group VII (bleaching + 0.5% CM), and group VIII (bleaching + 1% CM). In groups III-VIII, teeth were treated with the antioxidants for 10 minutes after bleaching with 40% HP, but before bonding. All the specimens were bonded with the resilience adhesive, and the SBS was tested with a universal testing machine (Instron 5965). The cross-head speed to break the bond was 1 mm/minute. The adhesive remnant index (ARI) was tested under 50× magnification. One-way analysis of variance, Tukey's post hoc, and Chi-squared tests were used for analysis (p ≤ 0.05). RESULTS: The differences in SBS among the eight tested groups were highly significant (p < 0.001). Comparison of the eight groups using Tukey's post hoc test revealed significantly lower SBS (p < 0.001) in test groups II, III, IV, and VIII than in group I. Adhesive remnant index scores showed significant intergroup differences (p = 0.005). Most groups had a failure score of 1 (<50% of the bonding material adhering to the tooth), whereas groups II and VIII showed a failure score of 0 (no material adhering to the tooth). CONCLUSION: Bond strength can be enhanced by using 0.5% or 1% GT or 0.5% CM to allow bracket bonding immediately after bleaching. CLINICAL SIGNIFICANCE: The use of antioxidants would allow clinicians to bleach teeth before orthodontic treatment without delaying bonding.


Asunto(s)
Recubrimiento Dental Adhesivo , Soportes Ortodóncicos , Blanqueamiento de Dientes , Antioxidantes , Análisis del Estrés Dental , Humanos
14.
Compend Contin Educ Dent ; 41(5): e11-e16, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32369381

RESUMEN

Clear aligner treatment has become popular for many orthodontic cases that ordinarily would have required traditional orthodontic brackets and wires. One of the motivating reasons for patients to use clear aligner therapy is to improve their esthetic appearance, which typically is the same motivation for teeth bleaching, thus a combination of the two treatments may be desirable. The case report presented demonstrates bleaching concurrent with clear aligner (Invisalign®) treatment. A concern about bleaching during such treatment is that the areas on the tooth under the composite attachments, or buttons, used to retain the clear aligner trays may remain unbleached. However, due to the small molecular size of the bleaching material agent and its ability to permeate the tooth, the area under the attachment will be bleached as well. With this understanding, a practitioner can treat patients more efficiently by being able to complete bleaching treatment simultaneously with clear aligner treatment.


Asunto(s)
Aparatos Ortodóncicos Removibles , Soportes Ortodóncicos , Blanqueamiento de Dientes , Atención Odontológica , Humanos
16.
Am J Dent ; 33(2): 79-82, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-32259412

RESUMEN

PURPOSE: To evaluate the bleaching efficacy of laser application with chemical treatment compared to chemical treatment alone. METHODS: This was a randomized controlled trial (RCT), single blind (evaluator), in 24 patients randomized into two groups: Laser and chemical intervention (12) or chemical intervention alone without laser (12). The commercial products used were Whiteness HP 35% hydrogen peroxide gel and the Whitening Laser II of DCM equipment. The color was measured with a spectrophotometer before, immediately and 3 days after the bleaching procedure. The trial outcome measures were obtained using the Vita EasyShade spectrophotometer and the International CIELCh system. To establish differences before vs. after treatments and between groups, the T test and chi² tests were applied. The data was statistically analyzed with Student's T-test (P ≤ 0.05). RESULTS: After applying the delta formula to measure the change in color, both groups gave clinically significant results before vs. after bleaching procedures ( P ≤ 0.05). The deltas for luminosity, chroma, and hue all showed significant improvements for baseline to 15 minutes post treatment (P ≤ 0.05), baseline to 3 days post treatment (P ≤ 0.05), but not for 15 minutes to 3 days post treatment (P ≥ 0.05). When comparing between groups applying T-test, no statistically significant differences were found (P ≥ 0.05) for all three deltas. When comparing sensitivity after bleaching, no differences were found between groups (P ≥ 0.05). CLINICAL SIGNIFICANCE: The use of laser during bleaching treatment did not improve the results compared to not using laser.


Asunto(s)
Sensibilidad de la Dentina , Blanqueadores Dentales , Blanqueamiento de Dientes , Color , Humanos , Peróxido de Hidrógeno , Resultado del Tratamiento
17.
Am J Dent ; 33(2): 89-94, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-32259414

RESUMEN

PURPOSE: This crossover study evaluated the hydrogen (HP) and carbamide (CP) peroxide degradation of bleaching gels in prefilled (PT) and customized trays (CT). METHODS: Volunteers were randomly allocated to treatments (n=10) : PT-HP/OGO (Opalescence GO-10%); CT-HP/WTC (White Class-10%) or CT-CP/OPF (Opalescence PF-10%). Gel samples were collected from the upper and lower trays in each period (baseline, 15, 30, 50 and 120 minutes). HP concentration was determined with the potassium permanganate titration method. Degradation was calculated based on initial concentration of gels. Repeated measures two-way ANOVA and Tukey's test (5%) were applied. RESULTS: Bleaching gels exhibited exponential degradation over time. In 30 minutes, no significant differences in degradation among them were detected (P= 0.13). After 2 hours, lower degradation of CT-CP/OPF (61.85±10.65), compared with hydrogen peroxide in PT and CT (71.55±8.24 and 78.69±9.33, respectively) was observed. The gels showed higher degradation rate in lower trays than in upper trays in all evaluated times. In general, the bleaching gels in lower trays degraded more than in upper trays. The carbamide peroxide gel presented lower degradation than hydrogen peroxide after 2 hours. The degradation of the 10% hydrogen peroxide gel used in prefilled trays was higher than the one in customized trays after 30 minutes, but after 120 minutes, the degradation rate was similar for both. CLINICAL SIGNIFICANCE: Bleaching gels degraded faster in lower arches than in upper arches. The degradation process was faster in the first 15 minutes of use and depended on the gel's composition, time of use, and tray position in the dental arches.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Estudios Cruzados , Humanos , Peróxido de Hidrógeno , Peróxidos , Urea
18.
Oper Dent ; 45(4): 368-376, 2020 Jul 01.
Artículo en Inglés | MEDLINE | ID: mdl-32216723

RESUMEN

CLINICAL RELEVANCE: This study suggests that at-home bleaching systems are safe in relation to toxicity based on peroxide levels in saliva since the amount of peroxide potentially ingested is much lower than the estimated toxic dose.


Asunto(s)
Peróxido de Hidrógeno , Blanqueamiento de Dientes , Peróxido de Carbamida , Estudios Cruzados , Combinación de Medicamentos , Geles , Peróxidos , Saliva , Urea
19.
Nat Commun ; 11(1): 1328, 2020 03 12.
Artículo en Inglés | MEDLINE | ID: mdl-32165627

RESUMEN

The increasing demand for a whiter smile has resulted in an increased popularity for tooth whitening procedures. The most classic hydrogen peroxide-based whitening agents are effective, but can lead to enamel demineralization, gingival irritation, or cytotoxicity. Furthermore, these techniques are excessively time-consuming. Here, we report a nondestructive, harmless and convenient tooth whitening strategy based on a piezo-catalysis effect realized by replacement of abrasives traditionally used in toothpaste with piezoelectric particles. Degradation of organic dyes via piezo-catalysis of BaTiO3 (BTO) nanoparticles was performed under ultrasonic vibration to simulate daily tooth brushing. Teeth stained with black tea, blueberry juice, wine or a combination thereof can be notably whitened by the poled BTO turbid liquid after vibration for 3 h. A similar treatment using unpoled or cubic BTO show negligible tooth whitening effect. Furthermore, the BTO nanoparticle-based piezo-catalysis tooth whitening procedure exhibits remarkably less damage to both enamel and biological cells.


Asunto(s)
Blanqueamiento de Dientes , Catálisis , Proliferación Celular , Humanos , Carmin de Índigo , Nanopartículas/química , Nanopartículas/ultraestructura , Espectrofotometría Ultravioleta , Cepillado Dental , Vibración
20.
Br Dent J ; 228(5): 333-337, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-32170243

RESUMEN

Internal bleaching is an effective and minimally invasive way of bleaching non-vital teeth. A commonly cited risk associated with it is external cervical resorption (ECR), which is a potentially significant complication that could result in loss of the tooth. This is an important point of discussion with a patient during the consent process. Legally, patients are required to be made aware of material risks to which they would be likely to attach significance, such as the loss of a tooth. The risk of ECR is therefore a key component in the patient's decision-making process as they weigh it against the perceived benefits. Over the last ten years, both clinical and legal reasons have resulted in a number of changes in the materials and protocols used for internal bleaching. This leads to the question of what the current quality of evidence is regarding the association of ECR following internal bleaching with modern protocols. Other restorative options for discoloured teeth, such as veneers or crowns, involve the irreversible removal of tooth tissue and these may be chosen by patients over internal bleaching based on out-of-date evidence.


Asunto(s)
Blanqueamiento de Dientes , Decoloración de Dientes , Diente no Vital , Diente , Humanos , Peróxido de Hidrógeno
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