Edson Araujo

Federal University of Santa Catarina, Nossa Senhora do Destêrro, Santa Catarina, Brazil

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Publications (5)0.81 Total impact

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    ABSTRACT: Objective: This study has instrumentally evaluated the influence of the application of a specific resin for the reproduction of the dentin-enamel junction (DEJ) in the optical properties of restorations with composites. Method: Resin blocks with 4mm of thickness, formed by 3 disks of resin corresponding to the vestibular enamel, dentin and palatal enamel were made. These blocks were divided into 2 groups conforming to the compound resin used for its making: group A (n=30), resin type Vit-l-escence (Ultradent); and group B (n=30), resin type 4 Seasons (Ivoclar Vivadent). Each group was subdivided into 05 subgroups (n=6), conforming to the reproduction or not of the DEJ: subgroup 1, without reproduction of DEJ; subgroup 2, reproduction of vestibular DEJ (V) with DE Connector (Ultradent); subgroup 3, reproduction of DEJ V and Palatine (P) with DE Connector; subgroup 4, reproduction of DEJ V with Single Bond (3M); and subgroup 5, reproduction of DEJ V and P with Single Bond. The blocks were analyzed in the spectrophotometer for evaluation of the reflection, brightness (coordinate L*) and fluorescence. The balances were submitted to the statistical test of variance analysis, theory of Tukey and Kruskal Wallis. Result: The reflection values and L* increased when the DE Connector was applied, however without a statistically significant difference between subgroups A2 and A3; and B2 and B3. The fluorescence was not influenced by the application of the DE Connector. Conclusion: The reproduction of dentin-enamel junction, through the DE Connector, between the resins for the enamel and dentin, is sufficient to increase the diffusion of internal light in a restoration with composite resin, since its use modifies the optical properties of the restoration.
    No preview · Conference Paper · Jun 2012
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    ABSTRACT: Dental erosion is a contemporary disease, mostly because of the change of the eating patterns that currently exist in society. It is a “silent” and multifactorial disease, and is highly influenced by habits and lifestyles. The prevalence of dental erosion has considerably increased, with this condition currently standing as a great challenge for the clinician, regarding the diagnosis, identification of the etiological factors, prevention, and execution of an adequate treatment. This article presents a dental erosion review and a case report of a restorative treatment of dental erosion lesions using a combination of bonded ceramic overlays to reestablish vertical dimension and composite resin to restore the worn palatal and incisal surfaces of the anterior upper teeth. Adequate function and esthetics can be achieved with this approach. It is essential for the practitioner to establish a correct and early diagnosis of dental erosion, as this condition is of growing concern and is becoming more prevalent in current society. (J Esthet Restor Dent ••:••–••, 2011)
    Full-text · Article · Aug 2011 · Journal of Esthetic and Restorative Dentistry
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    Junio S Almeida e Silva · Edson Medeiro de Araujo · Elito Araujo
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    ABSTRACT: This in vitro study evaluated the microtensile bond strength (muTBS) of composite resin bonded to dentin that had been contaminated by cigarette smoke. Ten extracted unerupted human third molars were used: Six molars were prepared for muTBS testing, while the other four molars were assigned to pre- and post-etching scanning electronic microscopy (SEM) analysis. The 20 specimens obtained from the 10 coronal portions were distributed into two experimental groups so that each tooth served as its own control. Group 1 underwent a daily toothbrushing simulation and exposure to a smoking simulation chamber, while Group 2 received only a daily simulated toothbrushing. Student's t-test demonstrated that Group 1 samples demonstrated significantly lower bond strength (49.58 MPa) than Group 2 samples (58.48 MPa). Pre and postetching SEM analysis revealed the presence of contaminants on the dentinal surfaces of the Group 1 specimens. It was concluded that contamination by cigarette smoke decreases the bond strength between dentin and composite resin.
    Full-text · Article · Nov 2009 · General dentistry
  • J. ALMEIDA E SILVA · E. ARAUJO
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    ABSTRACT: Objectives: The aim of this in vitro study was to evaluate the microtensile bond strength (μTBS) of composite resin bonded to cigarette smoke contaminated dentin. Methods: Ten extracted unerupted human third molars were used. Six molars were prepared for μTBS testing and the four remaining molars were assigned to pre and post-etching scanning electronic microscopy (SEM) analysis. By performing sequential sections, each tooth had its root portion eliminated and the remaining coronal portions were longitudinally sectioned into two, in a mesiodistal direction. In order to fabricate the specimens, each half was embedded in epoxy resin using a bipartite metallic matrix. Thus, twenty specimens were obtained from the ten teeth coronal portions, which were distributed into two experimental groups: CS (cigarette smoke) and NCS (no cigarette smoke), in such way that each tooth coronal portion was its own control. The CS specimens underwent a daily toothbrushing simulation and exposure to cigarette smoke regime. The NCS specimens underwent only a daily toothbrushing simulation regime. The μTBS test was conducted using a non-trimming technique with a three-step etch & rinse adhesive system. The specimen's dentinal surfaces received a six millimeters resin composite build-up. After 24h distilled water storage at 37 C, each specimen was longitudinally sectioned in both x and y directions in order to obtain rectangular sticks with a approximately 0.45 mm2 cross-sectional area. The fracture pattern of each stick was analyzed under a 25x magnification microscopy after debonding. Results: Student's t-test demonstrated that CS group presented significant lower bond strength (49.58 MPa) than NCS group (58.48 MPa). Pre and post-etching SEM analysis revealed the presence of contaminants on the dentinal surfaces of the CS specimens. Conclusions: Contamination by cigarette smoke decreases bond strength between dentin and composite resin.
    No preview · Conference Paper · Apr 2009
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    ABSTRACT: This article presents the essential aspects for understanding and reproducing the color of natural teeth with the use of direct resin composite. Fluorescence and opalescence are discussed, with special emphasis on counter-opalescence, which is primarily responsible for the appearance of an orange discoloration at the mamelon dentin tips and incisal edges of anterior teeth. The dynamics of color in natural teeth in relation to age is also discussed, focusing on the age-related changes that occur in enamel, dentin, and pulp. Further, it is demonstrated how to reproduce the esthetic features of natural teeth using latest-generation direct resin composites.
    No preview · Article · Feb 2007 · European journal of esthetic dentistry : official journal of the European Academy of Esthetic Dentistry, The