DH was a common finding in this population suggesting that preventive measures considering its risk factors must be implemented in order to reduce or control the symptoms.

This in vitro research verified the possibility of eliminating staining caused by coffee and red wine in five composite resins, after being submitted to thermal cycling. Thirty-six specimens were prepared and immersed in water at 37°C for 24 hours. After polishing, specimen color was measured in a spectrophotometer Cintra 10 UV (Visible Spectrometer, GBC, Braeside, VIC, Australia). All specimens were submitted to thermal cycling at temperatures of 5 and 55°C with a dwell time of 1 minute, for 1,000 cycles in a 75% ethanol/water solution. After thermal cycling, the specimens were immersed in water at 37°C until 7 days had elapsed from the time the specimens were prepared. All specimens were then taken to the spectrophotometer for color measurement. The specimens were divided into three groups (N = 12): distilled water (control), coffee, and red wine. For the staining process to occur on only one surface, all the sides, except one, of the surfaces were isolated with white wax. The specimens were immersed in one of the solutions at 37°C for 14 days. The specimens were dried and taken to the spectrophotometer for color measurement. After this, the specimens were submitted to 20 µm wear three times, and the color was measured after each one of the wear procedures. Calculation of the color difference was made using CIEDE2000 formula. According to the methodology used in this research, it was concluded that the staining caused by coffee and red wine was superficial and one wear of 20 µm was sufficient to remove the discoloration.

Owing to improvements in its mechanical properties and to the availability of shade and translucence resources, resin composite has become one of the most widely used restorative materials in present day Dentistry. The aim of this study was to assess the relation between the surface hardness of seven different commercial brands of resin composites (Charisma, Fill Magic, Master Fill, Natural Look, Opallis, Tetric Ceram, and Z250) and the different degrees of translucence (translucid, enamel and dentin). Vickers microhardness testing revealed significant differences among the groups. Z250 was the commercial brand that showed the best performance in the hardness test. When comparing the three groups assessed within the same brand, only Master Fill and Fill Magic presented statistically significant differences among all of the different translucencies. Natural Look was the only one that showed no significant difference among any of the three groups. Charisma, Opallis, Tetric Ceram and Z250 showed significant differences among some of the tested groups. Based on the results found in this study, it was not possible to establish a relation between translucence and the microhardness of the resin composites assessed. Depending on the material assessed, however, translucence variation did affect the microhardness values of the resin composites.

The ability to understand and distinguish color differences is extremely important in clinical dentistry. There could be differences in color perception between men and women that would influence clinical performance.

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Objective: The size of primary teeth in the current Brazilian population has not been studied yet; the aim of this in vitro study was to document the size and variation of deciduous teeth from a tooth bank in São Paulo, Brazil. Methods: A sample of 1,095 deciduous teeth was obtained from a tooth bank at the Dental School of the University of Sao Paulo. The measurements were made with a digital caliper. Only unworn, undamaged teeth were measured. Results: At mesiodistal diameter, maxillary central incisor showed the highest variation and the mandibular first molar the least. In buccolingual sizes, mandibular second molar was the tooth with the highest variability. Conclusion: This study provides a record of primary tooth sizes in Brazilian children. There was an evident variation of size of the primary teeth.

is related to the students' performance in carving practice. For this purpose, 76 theoretical exams (planned on the location of the anatomical features of the maxillary left canine tooth), and 76 wax sculptures (practical exam) were individually examined by two previously trained examiners for each trait. The data were organized in tables according to the characteristic analyzed and the type of exam (theoretical or practical). The chi-square test showed no statistically signifi cant difference between theoretical and practical exams (p ≥ 0.05). The tooth structure that students most answered correctly in both exams was the cingulum (79%) and the greatest shortcoming of students in associating both exams was the location of the palatine cervical bulge (19%). The fi ndings are based only on results of student performance with regard to the identifi cation and location of anatomical structures on one anterior tooth. Considering the data obtained, it was concluded that it was not possible to observe a relationship between the theoretical knowledge acquired by the students and their practical performance in tooth carving. Sculpture; Teaching; Tooth Components; Tooth / anatomy & histology.Conhecimento teórico versus performance prática em escultura dental -estudo preliminar • Conhecer a anatomia dos dentes é de fundamental importância na prática das diversas especialidades odontológicas. Todas as faculdades de odontologia possuem obrigatoriamente em sua grade curricular uma disciplina responsável pelo ensino da anatomia dental, na qual um conteúdo teórico é transmitido aos alunos para reprodução na escultura em cera. Assim, o objetivo deste estudo foi avaliar se o conteúdo teórico programático ministrado na

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