RESUMEN: El objetivo del presente estudio fue evaluar la resistencia a la fractura de los dientes restaurados con materiales compuestos convencionales, de relleno y reforzados con fibras, en relación con los dientes intactos. Se prepararon cavidades estándar en 70 dientes de terceros molares sanos. Los dientes se dividieron al azar en seis grupos: dientes intactos, compuesto convencional basado en Bis-GMA, compuesto reforzado con fibra, compuesto de relleno a base de Bis-GMA, compuesto de relleno a base de ormocer, compuesto de relleno a base de vidrio que contiene resina. Los resultados fueron obtenidos utilizando una máquina universal de pruebas y analizados estadísticamente. La resistencia a la fractura de los dientes restaurados con el composite convencional fue significativamente menor que la de los otros grupos (p<0,05). Los dientes restaurados con un compuesto reforzado con fibra mostraron la mayor resistencia a la fractura; sin embargo, no hubo diferencias estadísticamente significativas entre los dientes intactos y los dientes restaurados con un compuesto reforzado con fibra, un compuesto de relleno a base de Bis-GMA y un compuesto de relleno a base de resina de vidrio (p>0,05). Los datos obtenidos mostraron que la restauración de dientes con composites de relleno y reforzados con fibra podría ser recomendada en cavidades de Clase II.

ABSTRACT: This study aimed to evaluate the fracture resistance of teeth restored with conventional, bulk-fill, and fiber-reinforced composite materials regarding intact teeth. Standard cavities were prepared on 70 sound third molar teeth. The teeth were randomly divided into six groups: intact teeth, conventional Bis-GMA based composite, fiber-reinforced composite, Bis-GMA based bulk-fill composite, ormocer based bulk-fill composite, glass containing resin-based bulk-fill composite. The data was obtained by a Universal Testing Machine and analyzed statistically. Fracture resistance of the teeth restored with conventional composite was significantly lower than the other groups (p<0.05). The teeth restored with fiber-reinforced composite showed the highest fracture resistance; however, there were no statistically significant differences between intact teeth and teeth restored with fiber-reinforced composite, Bis-GMA based bulk- fill composite, and glass containing resin-based bulk-fill composite (p>0.05). The obtained data showed that restoring teeth with bulk-fill and fiber-reinforced composites could be recommended in Class II cavities.

Abstract Objective: To evaluate the effect of the COVID-19 pandemic on senior undergraduate dental students' psychological health by measuring depression, anxiety, and stress levels. Material and Methods: 259 fifth-year dental students participated in this study, including 156 females (60.2%) and 103 males (39.8%), aged 20–25. An online-based questionnaire was created, including a few questions about learning, post-graduation challenges, and fear of the virus exposure. Students were asked to define their acute anxiety state by visual facial anxiety scale (VFAS) and depression, anxiety, and stress levels by The Depression, Anxiety and Stress Scale (DASS-42). All data were analyzed statistically. Results: Participants stated online learning platforms were insufficient for clinical competence (91.5%), the COVID-19 pandemic changed post-graduation career perspectives (29.3%), and they feared exposure to COVID-19 while performing their profession (82.6%). Acute anxiety levels of the students were recorded as 95.4% mild to highest. Mild to extremely severe depression, anxiety, and stress scores of the participants were 82.1%, 79.6%, and 72.9%, respectively. Higher mean values for all depression, anxiety, and stress parameters were obtained in females than males (p<0.05). Conclusion: Data showed that the psychological health of senior undergraduate dental students had been affected adversely due to the COVID-19 pandemic.

Resumen El síndrome de Hallermann-Streiff (HSS) es una discefalia oculomandibulofacial rara con hipotricosis que ocurre como una mutación esporádica. Se caracteriza por hallazgos anormales, especialmente en cabeza y cara. Las anomalías dentales ocurren en 50-80% de los pacientes. En este reporte de caso, se identificaron los hallazgos faciales-orales y las anomalías dentales existentes del síndrome en un paciente masculino de 6 años diagnosticado con HSS. Se informó la rehabilitación dental y un seguimiento de 12 meses del paciente. Cada caso presentado con este síndrome raro puede contribuir a la literatura para determinar el pronóstico de la enfermedad y tomar medidas de protección y prevención.

Abstract Hallermann-Streiff syndrome (HSS) is a rare oculomandibulofacial discephaly with hypotrichosis that occurs as a sporadic mutation. It is characterized by abnormal findings especially in head and face. Dental anomalies occur in 50-80% of the patients. In this case report, facial-oral findings and the existing dental anomalies of the syndrome in a 6-year-old male patient diagnosed with HSS were identified. Dental rehabilitation and a 12-month follow-up of the patient were reported. Each case presented with this rare syndrome may contribute to the literature to determine the prognosis of the disease and to take protective and preventive measures.