Marcelo Coelho Goiato

Bio: Marcelo Coelho Goiato is an academic researcher from Sao Paulo State University. The author has contributed to research in topics: Acrylic resin & Dental prosthesis. The author has an hindex of 30, co-authored 314 publications receiving 4141 citations. Previous affiliations of Marcelo Coelho Goiato include University of São Paulo.

Patient satisfaction with maxillofacial prosthesis. Literature review.

Abstract: Sao Paulo State Univ, UNESP, Aracatuba Dent Sch, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil

Color stability of sealed composite resin restorative materials after ultraviolet artificial aging and immersion in staining solutions

Abstract: Statement of problem The color alteration of resin-based materials is one of the most common reasons to replace esthetic dental restorations. Purpose This study assessed the influence of surface sealant (Biscover) on the color stability of nanofilled (Supreme XT) and microhybrid (Vit-l-escence and Opallis) composite resins after artificial aging. Material and methods One hundred disc-shaped (6 × 1.5 mm) specimens were made for each composite resin. After 24 hours, all specimens were polished and sealant was applied to 50 specimens of each material. Baseline color was measured according to the CIE L*a*b* system using a reflection spectrophotometer. Ten specimens of each group were aged for 252 h in an ultraviolet (UV)-accelerated aging chamber or immersed for 4 weeks in cola soft drink, orange juice, red wine staining solutions or distilled water as control. Color difference (ΔE) after aging was calculated based on the color coordinates before (baseline) and after aging/staining treatment. Data were analyzed with 2-way ANOVA and Fisher's test (α=.05). Results The results showed significant changes in color after artificial aging in all the groups ( P Conclusions All composite resins showed some color alteration after the aging methods. The surface sealant did not alter the color stability of the tested materials.

Use of Stress Analysis Methods to Evaluate the Biomechanics of Oral Rehabilitation With Implants

Abstract: Because the biomechanical behavior of dental implants is different from that of natural tooth, clinical problems may occur. The mechanism of stress distribution and load transfer to the implant/bon...

American Society for Testing and Materials

Abstract: The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.

United Nations High Commission for Refugees

Abstract: 4. UNHCR notes with concern that although the country acceded to the 1951 Convention and the 1967 Protocol in 1999, incorporation of the 1951 Convention obligations into national legislation and normative acts has been slow and to date Kazakhstan has failed to comply with its obligation to give full effect to the Covenant in the domestic legal order, inter alia providing for effective judicial and other remedies for violations of these rights

Bone Regeneration Based on Tissue Engineering Conceptions — A 21st Century Perspective

Abstract: The role of Bone Tissue Engineering in the field of Regenerative Medicine has been the topic of substantial research over the past two decades. Technological advances have improved orthopaedic implants and surgical techniques for bone reconstruction. However, improvements in surgical techniques to reconstruct bone have been limited by the paucity of autologous materials available and donor site morbidity. Recent advances in the development of biomaterials have provided attractive alternatives to bone grafting expanding the surgical options for restoring the form and function of injured bone. Specifically, novel bioactive (second generation) biomaterials have been developed that are characterised by controlled action and reaction to the host tissue environment, whilst exhibiting controlled chemical breakdown and resorption with an ultimate replacement by regenerating tissue. Future generations of biomaterials (third generation) are designed to be not only osteoconductive but also osteoinductive, i.e. to stimulate regeneration of host tissues by combining tissue engineering and in situ tissue regeneration methods with a focus on novel applications. These techniques will lead to novel possibilities for tissue regeneration and repair. At present, tissue engineered constructs that may find future use as bone grafts for complex skeletal defects, whether from post-traumatic, degenerative, neoplastic or congenital/developmental "origin" require osseous reconstruction to ensure structural and functional integrity. Engineering functional bone using combinations of cells, scaffolds and bioactive factors is a promising strategy and a particular feature for future development in the area of hybrid materials which are able to exhibit suitable biomimetic and mechanical properties. This review will discuss the state of the art in this field and what we can expect from future generations of bone regeneration concepts.