Marcos de Oliveira Barceleiro

Changes in surface roughness and color stability of two composites caused by different bleaching agents

The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukeys test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

Clinical Considerations on the Root Coverage of Gingival Recessions in Thin or Thick Biotype.

Gingival biotype is a clinical term used to describe the thickness of the gingiva. It has been classified as being thick or thin and may be related to the clinical outcome of root coverage procedures. This study evaluated the impact of gingival biotype on the clinical outcome of root coverage procedures following subepithelial connective tissue graft plus coronally positioned flap. A total of 19 patients, 10 with thin and 9 with thick gingival biotype, were treated for localized Miller Class I or II gingival recessions. After 6 months, 14 patients achieved complete root coverage, 7 from each group. The overall mean pooled root coverage rate was 90.93%. The thin biotype cases yielded a reduced mean root coverage of 88.51% compared with 93.63% for patients who had the thick biotype classification. Although the thin gingival biotype may impair the clinical outcome of root coverage procedures, this limitation does not appear to have a strong influence on the success of the root coverage therapy when subepithelial connective tissue graft was associated with the coronal positioning of the flap.

Periodontal Plastic Microsurgery in the Treatment of Deep Gingival Recession after Orthodontic Movement

Gingival recession is a condition that affects a large portion of the young and adult population and negatively affects the aesthetic aspects of the smile. Many factors are related to its development, including orthodontic movement beyond the osseous limits. Many treatment options have been proposed to cover the exposed root surface. The aim of this article was to describe three cases where a subepithelial connective tissue graft was performed, using a microsurgical technique, in the treatment of deep gingival recession after orthodontic treatment. This technique resulted in successful root coverage and keratinized tissue gain, improving the gingival esthetic pattern.

Um novo adesivo universal simplificado: ensaio clínico multicêntrico randomizado de 6 meses

Objective: the objective of this multi-center double-blind, randomized clinical trial was to evaluate the clinical performance of a new universal adhesive system (Futurabond U, Voco GbmH, Germany) when applied using different application strategies over a period of six months. Material and Methods: for this, 200 restorations were performed on non-carious cervical lesions using the adhesive Futurabond U according to four adhesive strategies (n = 50 per group): self-etch without previous conditioner (SEE); self-etch associated with selective enamel etching (SET); etch-and-rinse with dry dentin (ERDry) and; etch-and-rinse with wet dentin (ERWet). After hybridization, cavities were restored using Admira Fusion composite resin (Voco GmbH). After 6 months of clinical performance, these restorations were evaluated according to FDI criteria in the following items: retention/fracture, marginal adaptation, marginal staining, postoperative sensitivity and caries recurrence. Results: seven restorations were lost/fractured after six months of clinical evaluation (2 in the SEE group, 1 in the SET group, 1 in the ERDry group, and 3 in the ERWet group). The retention rates for six months (95% confidence interval) were 96% (86%-98%) for the SEE group, 98% (89%-99%) for the SET group, 98% (89%-99%) for the ERDry group and 94% (83%-97%) for the ERWet group, with no statistical difference identified between any pair of groups (p > 0.05). Twenty-four restorations presented small marginal adaptation defects at the six-months evaluation recall, and all of them were considered clinically acceptable. Conclusion: the clinical performance of the universal adhesive Futurabond U associated to Admira Fusion unidoses resin composite was found to be promise after 6-month of clinical evaluation when applied in non-carious cervical lesions and it was not depending on the bonding strategy employed.

Effects of non-surgical periodontal treatment on complete blood count, lipid and glycemic profiles of patients with an indication for surgical coronary revascularization

Objective: the aim of this study was to assess the effects of non-surgical periodontal treatment on the complete blood count, glycemic and lipid profiles in cardiopathic patients with indication for surgical revascularization. Material and Methods: this study evaluated 22 patients with chronic periodontitis, over 35 years of age (mean age 59.45 years) randomly assigned to 2 groups. The test group (n=11) received periodontal treatment before the surgical procedure and the control group (n=11) did not receive periodontal treatment prior to surgery. Results: periodontal treatment resulted in a significant reduction in probing depth in sites with periodontal probing depth >3 mm (reduction of 11.4%) and >5 mm (reduction of 6.3%) (P 0.05). The values regarding to leukocyte count, glucose, hemocyte and hemoglobin did not differ significantly between groups (P>0.05). Total cholesterol and high density lipoprotein presented a statistically significant reduction in the test group (P 0.05). Conclusion: non-surgical periodontal treatment was effective for controlling periodontal disease and diminished serum levels of total cholesterol and high density lipoproteins. The other blood components presented no significant alterations.

Prevalence of dehiscences and fenestrations in human cadavers

Objective: the aim of the present study was to evaluate the prevalence of dehiscences and fenestrations in a convenience sample of human cadavers to provide accurate identification of bone defects. Material and Methods: twenty human cadavers, ranging in age from 20 to 40 years, were evaluated for dehiscences and fenestrations, which were verified after mucoperiosteal flap elevation. Results: the prevalence of dehiscences and fenestrations in the specimens was confirmed as being 40%, accounting for 5% of teeth with lesions. The most prevalent lesions were dehiscences, while only one single case of maxillary fenestration was observed. Conclusion: the planning of any periodontal plastic surgeries performed in the anterior region must take into account the possibility of periodontal defects. Therefore, considering the high prevalence of bone defects with potential impact in the esthetic outcome, the manipulation of soft tissues should be done carefully, especially in patients with a thin periodontium.