Objective: Thermally activated acrylic resins (RAATs) are widely used in dentures as a base material due to their good dimensional stability and biocompatibility. However, their low thermal conductivity is a disadvantage, as it affects acceptance when using dental prostheses. Thus, the objective of this work was to measure the conduction heat in RAATs with and without incorporation of silica and silver nanoparticles (NP) and rigid reline (RR). Material and Methods: For this, samples were made and divided into 10 groups (n = 6). The first five groups were 2-mm-thick samples: G1 (RAAT control), G2 (RAAT + RR control), G3 (RAAT and NP + RR), G4 (RAAT + RR and NP), and G5 (RAAT and RR modified by NP). In the other five groups, 8-mm-thick samples were made: G6 (RAAT control), G7 (RAAT + RR control), G8 (RAAT and NP + RR), G9 (RAAT + RR and NP), and G10 (RAAT and RR modified by NP). The heat that cross the surface of the specimens was quantified using a wireless device. The data were submitted to two-factor ANOVA statistical analysis and Tukey´s test with a 5% significance level. Results: After measuring the temperature variation as a function of time, it can be observed that there was a statistically significant difference for thermal conduction between the control groups and those modified with NP. Conclusion: Thus, it was possible to conclude that the NP improved the heat conduction in RAAT and in the RR because the nanoparticles have a higher thermal conductivity.
OBJECTIVE: To review the literature on the digital planning and diagnosis protocol known as "Digital Smile Design", highlighting its main advantages concerning aesthetic rehabilitation in restorative dentistry. MATERIAL AND METHOD: 60 articles were searched in Pubmed, Scielo, and Bireme databases, using the search terms Dental photography, cosmetic dentistry, treatment protocols. Inclusion criteria were: In vivo studies, systematic reviews and meta-analysis, literature addressing variables under study, language in Portuguese and English, and articles published from 1990 to 2020. Exclusion criteria were: letter to the editor, literature review, and clinical case. RESULTS: DSD is a treatment planning tool used in interdisciplinary aesthetic dentistry to strengthen the diagnostic vision, improve communication between specialists and patient guidance. Smile design refers to the many scientific and artistic principles that, collectively, can create a beautiful smile. These principles are established through data collected from patients as diagnostic models, anamnesis, and measurement of facial proportions. In turn, the aesthetic composition of the smile depends on many points of reference and anatomical parameters for the formation of a harmonious and beautiful set. FINAL CONSIDERATIONS: the DSD is an important tool to be used for aesthetics rehabilitations in restorative dentistry, since it is an instrument that facilitates the diagnosis, improves communication between the multidisciplinary team and assists in the orientation and motivation of the patient, increasing the predictability of treatments.
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