No abstract

Background Social isolation is ongoing worldwide with the aim to stem the spread of the novel coronavirus SARS‐CoV‐2 responsible for the COVID‐19 pandemic. However, social isolation leads to significant psycho‐emotional changes. This study aimed to assess the effect of distance education (DE) activities implemented due to social isolation, on the quality of life of undergraduate dentistry students. Method An e ‐questionnaire (Google Forms®) was administered to identify specific DE activities after social isolation and included the World Health Organization Quality of Life (WHOQOL)‐bref questionnaire. The e ‐questionnaire was sent 14 days after the initiation of social isolation, remaining available for 48h. Cronbach’s alpha and the means of the quality of life domains were calculated and analyzed using the Friedman/Dunn and Spearman’s correlation tests. After ranking, Chi‐squared and Fisher’s exact tests plus multinomial‐logistic‐regression were performed (SPSS, p<0.05). Result There was an excellent internal consistency of WHOQOL‐bref (α=0.916), and the mean quality of life (0‐100) was 70.66±12.61. The psychological domain was the most affected (p<0.001). The social domain exhibited the weakest correlation with overall quality of life (p<0.001, r=0.688). The use of the Internet, cell phones, and streaming media increased, although all students had DE activities. In the multivariate analysis, attending virtual meetings (p=0.028) and performing DE activities in an office/study room (p=0.034) were significantly associated with good quality of life. Conclusion Facing social isolation never previously experienced by this generation, undergraduate dentistry students are at risk of reduced quality of life. Therefore, performing DE activities through devices with teacher‐student interaction is a key coping tool.

A novel antimicrobial orthodontic band cement was developed that has comparable mechanical properties to controls, controlled and sustained Ag(+) ion release, significant bacterial inhibition in vitro, and excellent biocompatibility.

No abstract

No abstract

Background Implant design and apical stability are principal parameters involved in achieving successful primary stability. Using polyurethane models to simulate post-extraction sockets, we investigated the effects of using differing blade designs on the primary stability of tapered implants and the impact of apical depth. Method Six polyurethane blocks were used to simulate post-extraction pockets. One of the implants presented self-tapping blades (Group A), while the other (Group B) did not. Seventy-two implants were placed at 3 different depths (5 mm, 7 mm, and 9 mm), and a torque wrench was used to measure the stability of the implants. Results When evaluating the implants (placed at 5 mm, 7 mm, and 9 mm apical to the socket), we observed that the torque of the Group B implants was higher than that of Group A implants (P < 0.01). At the 9-mm depth, there was no difference between the groups (Drive GM 34.92 Ncm and Helix GM 32.33 Ncm) (P > 0.001), and considering the same implant groups, those placed at 7-mm and 9-mm depths presented higher torques (p < 0.01) than those placed at 5-mm (p > 0.01). Conclusion Considering both groups, we concluded that an insertion depth of greater than 7 mm is needed for initial stability, and in situations involving reduced supportive bone tissue or low bone density, a non-self-tapping thread design improves implant stability.

Introdução: o objetivo do presente trabalho foi avaliar, por meio do método de filtração de fluidos, a influência da solução irrigadora e diferentes associações de materiais obturadores na infiltração apical. Metodologia: foram utilizados 112 pré-molares inferiores extraídos, divididos em dois grupos controle (n=8) e oito grupos experimentais (n=12), de acordo com a solução irrigante: hipoclorito de sódio (H), vinagre de maçã (V), e, de acordo com o material obturador, guta-percha/AH Plus (GA), Resilon/Epiphany (RE), guta-percha/Epiphany (GE) e Resilon/AH Plus (RA). Os canais radiculares foram instrumentados e obturados pela técnica híbrida de Tagger. Em seguida, os canais foram desobturados nos terços médio e cervical, permanecendo apenas 4 mm do terço apical para a análise da infiltração pelo método de filtração de fluidos. Os dados foram analisados, estatisticamente, pelo teste de Kruskal-Wallis, sendo considerado significante quando P<0,05. Resultados: as médias obtidas de infiltração apical (μL/min) nos grupos foram: H/GA (0,03 ± 0,09), V/GA (0,04 ± 0,05), H/RE (0,06 ± 0,13), V/RE (0,10 ± 0,20), H/GE (0,08 ± 0,18), H/GE (0,16 ± 0,21), H/RA (0,40 ± 0,63) e V/RA (0,57 ± 1,13). Não foi observada diferença estatística quanto às soluções de irrigação aplicadas (P>0,05). No entanto, em relação aos materiais obturadores, verificou-se que os grupos obturados com a associação Resilon/AH Plus apresentaram, significativamente, maior infiltração que os demais grupos (P<0,05). Conclusões: concluiu-se que a infiltração apical foi influenciada apenas pelos materiais obturadores, independentemente da solução de irrigadora.

No abstract