Effect of coffe and a cola-based soft drink on the color stability of bleached bovine incisors considering the time elapsed after bleaching

There is no consensus about the waiting time necessary for the patient to start consuming beverages containing colorants again after bleaching. Objective: To evaluate the influence of beverages with coloring agents on bleached bovine incisors considering the time elapsed after bleaching. Materials and methods: Sixty bovine incisors were bleached with 35% hydrogen peroxide for in-office use (Whiteness HP Max) and divided into 10 groups. The color was evaluated with a spectrophotometer (Spectro Shade MICRO) before and after bleaching, employing the CIE-Lab system. After bleaching, the teeth were exposed for 5 min to coffee or cola-based soft drink (CBSD) at different periods after bleaching: 10 min, 1 h, 24 h, 48 h, and 72 h. Color (∆E) and lightness (∆L) variations were obtained from the CIE-Lab coordinates. Data were subjected to two-way ANOVA and Tukey HSD tests (p<0.05). Results: Significant differences were observed between groups for both the ∆L and ∆E values (p<0.001). All specimens presented a decrease in brightness (negative ∆L). The highest ∆E values were observed for teeth stained with a CBSD at 10 min and 1 h (4.12 and 4.16, respectively). Teeth pigmented with coffee presented ∆E values below 3.3 units for all evaluation times. Conclusion: The exposure to coffee after bleaching causes less color changes than the exposure to a CBSD regardless of the time after bleaching. .

Effect of coffee and a cola-based soft drink on the color stability of bleached bovine incisors considering the time elapsed after bleaching.

UNLABELLED: There is no consensus about the waiting time necessary for the patient to start consuming beverages containing colorants again after bleaching. OBJECTIVE: To evaluate the influence of beverages with coloring agents on bleached bovine incisors considering the time elapsed after bleaching. MATERIALS AND METHODS: Sixty bovine incisors were bleached with 35% hydrogen peroxide for in-office use (Whiteness HP Max) and divided into 10 groups. The color was evaluated with a spectrophotometer (Spectro Shade MICRO) before and after bleaching, employing the CIE-Lab system. After bleaching, the teeth were exposed for 5 min to coffee or cola-based soft drink (CBSD) at different periods after bleaching: 10 min, 1 h, 24 h, 48 h, and 72 h. Color (∆E) and lightness (∆L) variations were obtained from the CIE-Lab coordinates. Data were subjected to two-way ANOVA and Tukey HSD tests (p<0.05). RESULTS: Significant differences were observed between groups for both the ∆L and ∆E values (p<0.001). All specimens presented a decrease in brightness (negative ∆L). The highest ∆E values were observed for teeth stained with a CBSD at 10 min and 1 h (4.12 and 4.16, respectively). Teeth pigmented with coffee presented ∆E values below 3.3 units for all evaluation times. CONCLUSION: The exposure to coffee after bleaching causes less color changes than the exposure to a CBSD regardless of the time after bleaching.

Endocrown para o tratamento de dentes despolpados / Endocrown: an alternative treatment for pulpless teeth

Um dos problemas odontológicos mais vivenciados pelos cirurgiões dentistas refere-se ao tratamento restaurador de dentes despolpados. Nessas situações, a retenção para o material restaurador é normalmente crítica. Quando a região da câmara coronária apresenta condições adequadas para os princípios de retenção podem-se empregar as coroas tipo Endocrown. No entanto, atualmente, este tipo de tratamento se torna não apenas um problema funcional, mas também estético. Dessa forma, o objetivo deste trabalho é apresentar uma sequência operatória para restaurar um dente posterior despolpado utilizando uma coroa Endocrown para restabelecer a função e a estética

One of the most common problems faced by the dentists is the restorative treatment of pulpless teeth. In these situations the retention for the restorative material is usually critic. When the pulp chamber presents appropriate conditions for the retention the Endocrown type crown can be used. However, nowadays, this type of treatment becomes not only a functional problem, but also an aesthetic one. In that way, the aim of this work was to present an operative sequence to restore a non vital tooth using Endocrown to reestablish aesthetics and function

Using chemical vapor deposition diamond finishing burs for conservative esthetic procedures.

The article demonstrates how chemical vapor deposition (CVD) diamond burs were used in a simple esthetic and cosmetic procedure to treat discolored anterior teeth. A patient who experienced discoloration after bleaching was treated with direct resin composite veneers. Excess restorative material close to the periodontium was removed with a CVD diamond bur attached to an ultrasonic handpiece. The results indicate that CVD diamond burs are appropriate for removing excess material at the gingival margins of resin composite restorations without damaging the periodontium.

The efficacy of acid etching for removing contamination in layered dental restorations.

Contamination between incremental layers of a composite resin restoration can occur during surgical procedures. The present study sought to evaluate how two decontamination treatments affected the shear bond strength between layers of a saliva-contaminated composite resin surface. Forty disks of a nanohybrid composite resin were prepared and divided into four groups (n = 10). The surfaces of all specimens (except for samples in Group 1, the positive control) were contaminated with human saliva. For the negative control samples (Group 2), no decontamination was performed. For Group 3 samples, acid etching was performed and adhesive was applied. For Group 4, surfaces were roughened with a diamond bur prior to acid etching and adhesive application. The specimens were submitted to a shear bond strength test, and the data were analyzed using one-way ANOVA and Tukey tests (α = 0.05). No significant differences were detected between the mean shear bond strengths of samples in Groups 1, 3, and 4 (p < 0.05). Shear bond strength was significantly reduced in Group 2 samples (p < 0.05). Acid etching and the application of adhesive improved shear bond strength, producing values similar to those in the positive control group.

Free-hand stratification with composite resins for the closure of anterior diastema

Introduction: Dental diastemas are common findings at dental clinics. This clinical situation produces discomfort in many patients and its solution is difficult to many professionals. Silicone guides, made from waxed casts, have been used to assist the stratification of resin composites in cases of dental diastemas. This technique, however, does not necessarily need to be used as protocol in all situations. Objective: To demonstrate the stratification technique without silicone guides. Case report: The present study reports a case of stratification technique for anterior diastemas closure without silicone guide. Conclusion: The closure of diastemas can be quickly and easily performed using composite resins without the need of previously manufacturing silicone guides.