Edson Araujo

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

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Publications (7)2.57 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.
    IADR General Session 2012; 06/2012
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    ABSTRACT: The translucency of enamel shade is a crucial property that affects the color of a layered restoration. This study evaluated the translucency of high-, medium-, and low-value resin composites (4 Seasons, Ivoclar Vivadent, Schaan, Liechtenstein) used to replace enamel in stratified composite restoration techniques. The color specimens with 12 mm in diameter and various thicknesses (0.5, 1.0, 1.5, 2.0, 3.0, 4.0 mm) were measured after polymerization on a reflection spectrophotometer over white and black backgrounds to calculate the translucency parameter (TP). The statistical analysis of TP was accomplished using two-way analysis of variance (p < 0.05). Significant differences were revealed by the Tukey's Honestly Significant Difference post hoc test. Translucency of the value composite resins was influenced by the value and thickness. Color of value resin composites was dependent on the background contrast at the evaluated thicknesses. High-value composite resins were more translucent than medium-value composites, which were more translucent than low-value composites. The translucency decreased as the thickness of the specimens increased. The results suggest that special attention should be paid to the thickness of the increment of value composite resins when reproducing translucency of natural tooth enamel.
    Journal of Esthetic and Restorative Dentistry 02/2012; 24(1):53-8. DOI:10.1111/j.1708-8240.2011.00419.x · 0.81 Impact Factor
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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)
    Journal of Esthetic and Restorative Dentistry 08/2011; 23(4):205-16. DOI:10.1111/j.1708-8240.2011.00451.x · 0.81 Impact Factor
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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.
    IADR General Session 2009; 04/2009
  • Luiz Narciso Baratieri · Edson Araujo · Sylvio Monteiro ·
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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.
    European journal of esthetic dentistry : official journal of the European Academy of Esthetic Dentistry, The 02/2007; 2(2):172-86.
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    ABSTRACT: Contemporary adhesive restorations allow clinicians to deliver minimally invasive, functional, and aesthetic treatment for compromised dentition in the anterior and posterior regions. Part 1 of this article discussed the state-of-the-art relating to composite restorations, both in situations deemed to be relatively uncomplicated and those that are more complicated. This second part discusses the clinical protocol for the placement of direct composite materials as well as the tooth preparation considerations that must be addressed when providing minimally invasive treatment options.
    Practical procedures & aesthetic dentistry: PPAD 07/2003; 15(5):351-7; quiz 359.
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    ABSTRACT: Coronal fractures must be approached in a methodical and clinically indicated way to achieve successful restoration. One option for treatment is reattachment of the dental fragment. Reattachment creates a very positive emotional response in the patient and simplifies the maintenance of the patient's original occlusion. This article discusses dental fragment reattachment techniques and presents clinical cases of coronal fracture involving enamel, dentin, and pulpal exposure.
    Quintessence international 03/2003; 34(2):99-107. · 0.95 Impact Factor