RESUMEN
OBJECTIVE: The objective of this study was to evaluate the resin-ceramic adhesion of a long-carbon-chain silane (LCSI)-containing resin cement. METHODS: Polished lithium disilicate ceramic discs were etched with hydrofluoric acid and randomly assigned into four groups; (PSAP), cemented using a silane-free resin cement with no prior priming; (PSAP-S), primed using a silane-containing primer before cementation using a silane-free resin cement; (PSAU), cemented using a LCSI-containing resin cement with no prior priming; (PSAU-S), primed as for the group (PSAP-S) and cemented using a LCSI-containing resin cement. The cemented blocks were sectioned into microbeams. The resin-ceramic microtensile bond strength (µTBS) was measured at 1 week and after thermocycling. The failure modes of the tested microbeams were evaluated. RESULTS: The µTBS of the LCSI-containing and silane-free resin cements, either with or without a prior priming step, did not significantly differ. The adhesion of the LCSI-containing resin cement to lithium disilicate ceramic, either with or without a prior priming step, did not significantly deteriorate after artificial aging. CONCLUSIONS: The long-carbon-chain silane (LCSI) monomer incorporated in the resin cement eliminated the need for a silane priming step of a hydrofluoric acid-etched lithium disilicate ceramic.
RESUMEN
Aim: The present study was undertaken to assess the knowledge and practice of ergonomics among dental practitioners in Riyadh, Saudi Arabia. Methodology: A self-administered questionnaire was distributed among dental practitioners through Google Forms. Link of the questionnaire was sent through social media and e-mail. The questionnaire was focused on the awareness of ergonomics and practice of ergonomics during dental practice. Results: About 97.9% of participants are aware of different operating positions. About 71.7% of participants rate their operating procedure chair positions as good. 52.5% admit they feel numb fingers while working. Many questions were statistically significant according to educational qualification and type of practice (P < 0.050. Conclusion: Majority of the study population were aware of proper chair positions, correct operating procedures and were practicing four-handed dentistry, maintained proper back support while working, and even performed stretching exercises during clinical working hours.