RESUMEN
BACKGROUND: Self-assessment is key to improving the quality of work performed by dental professionals. The ability to accurately self-assess has been found to correlate with better clinical performance, making it an important skill for students to master during their dental education. Furthermore, studies conducted in dental schools across the world have shown that lower-performing students tend to overestimate their abilities compared to their peers. OBJECTIVES: This study aimed to evaluate the self-assessment skills of dental students in pre-clinical operative dentistry and to investigate the impact of gender on these skills. MATERIAL AND METHODS: Third-year undergraduate dental students (N = 335) took 2 pre-clinical practical exams: class II composite preparation and restoration. Students self-assessed each assignment using a standardized rubric, and 6 calibrated faculty members graded all procedures blindly and independently. The difference between students' self-assessment scores (S) and mean faculty grades (F) reflected the students' self-assessment skills and was referred to as the Student-Faculty (S-F) gap. A positive S-F gap indicates that students overestimate their work, while a negative S-F gap indicates that students underestimate their work. Data was stratified by gender and by faculty-determined student performance, and then statistically analyzed. RESULTS: The study demonstrated a statistically significant difference between faculty grades and students' self-assessment scores. Positive S-F gaps were observed across all procedures, indicating overestimation, with a mean S-F gap of 11.4 ±9.9%. A negative correlation was found between faculty grades and S-F gaps. Higher-performing students showed smaller S-F gaps (4.8 ±5.3%) compared to lower-performing students (21.2 ±9.68%). Furthermore, male students showed significantly higher S-F gaps (14.0 ±10.3%) compared to females (9.7 ±9.4%). CONCLUSIONS: Overestimation was more prevalent among lower-performing and male students compared to higher-performing and female students. Future investigations should consider exploring effective interventions and educational strategies aimed at improving students' self-awareness and their ability to accurately assess their performance.
RESUMEN
Objective: To evaluate the effect of saliva contamination and different decontamination protocols on the microshear bond strength of a universal adhesive to dentin. Material and Methods: 84 bovine teeth were divided into three groups according to bonding stage at which salivary contamination occurred; before curing of the adhesive, after curing of the adhesive, and a control group with no salivary contamination. Each group was further subdivided into four subgroups according to the decontamination protocol used (n=7): no decontamination protocol, rinsing then reapplication of the adhesive, grinding with sandpaper silicon carbide grit 600 then reapplication of the adhesive and finally ethanol application then reapplication of the adhesive. Specimens were tested in micro-shear mode. Results: All the decontamination protocols used in this study to reverse effect of salivary contamination before curing significantly improved the bond strength to contaminated dentin (p<0.001). Meanwhile, after curing, ethanol decontamination protocol recorded highest bond strength followed by rinsing and grinding compared to no decontamination (p<0.001). Conclusion: Saliva contamination led to significant deterioration in the bond strength regardless of the bonding stage at which saliva contamination occurred. All decontamination protocols improved the immediate microshear bond strength when contamination occurred before curing of the adhesive, while ethanol seemed to be the most effective both before curing and after curing (AU)
Objetivo: Avaliar o efeito da contaminação por saliva e de diferentes protocolos de descontaminação na resistência de união ao microcisalhamento de um adesivo universal à dentina. Material e Métodos: 84 dentes bovinos foram divididos em três grupos de acordo com o passo operatório do protocolo adesivo em que ocorreu a contaminação por saliva: antes da polimerização do adesivo, ou após a polimerização do adesivo e um grupo controle sem contaminação por saliva. Cada grupo foi subdividido em quatro subgrupos de acordo com o protocolo de descontaminação utilizado (n=7): sem protocolo de descontaminação; lavagem seguida da reaplicação do adesivo; lixar a região com lixa de carbeto de silício de granulação 600 e reaplicar o adesivo; aplicar etanol e reaplicar o adesivo. Os espécimes foram testados no modo de micro-cisalhamento. Resultados: Todos os protocolos de descontaminação utilizados neste estudo em busca de reverter o efeito da contaminação do adesivo por saliva melhoraram significativamente a resistência de união à dentina contaminada (p<0,001). Enquanto isso, após a polimerização, o protocolo de descontaminação com etanol resultou na maior resistência de união, seguido pela lavagem, e depois pelo lixamento, em comparação com nenhum protocolo de descontaminação (p<0,001). Conclusão: A contaminação por saliva levou a uma deterioração significativa na resistência de união, independentemente do passo operatório do protocolo adesivo em que ocorreu a contaminação por saliva. Todos os protocolos de descontaminação melhoraram a resistência de união ao microcisalhamento imediato quando a contaminação ocorreu antes da polimerização do adesivo, enquanto o etanol pareceu ser o protocolo mais eficaz nos dois tipos de contaminação (antes e depois da polimerização).
Asunto(s)
Saliva , Descontaminación , Recubrimientos Dentinarios , Resistencia al Corte , EtanolRESUMEN
This study evaluated the interfacial integrity of deep (6 mm) Class-II (OM/OD) restorations placed using different bulk-fill resin composites [Filtek™ Bulk Fill Flowable Restorative (BF) and Filtek™ Bulk Fill Posterior Restorative (BP) (3M ESPE, St. Paul, MN, USA)] of different increment thicknesses (2 or 4 mm). BP was used for capping in all cases, while Filtek™ Z250 Universal Restorative (3M ESPE) was used as the control material. Interfacial debonding was measured during curing through acoustic emission (AE), followed by image analysis using micro-computed tomography and scanning electron microscopy. Microhardness testing was also conducted to assess degree of conversion. Depth of cure was adequate in all restorations. Specimens with 4-mm thick first increment of BF, which had a higher shrinkage strain, produced most AE events and debonding. Thus, bulk filling of deep cavities using bulk-fill resin composites with a high shrinkage strain should be avoided.
