• Comparación in vitro de la cantidad de debris apical extruido tras la utilización de una técnica manual, un sistema rotatorio y un reciprocante

      Vertiz Falla, Augusto Rensso; Chiarella Montoya, Sara Grecia (Universidad Peruana de Ciencias Aplicadas (UPC)PE, 07/11/2015)
      Objective: Compare in vitro the weight of extruded apical debris using a manual technique, a Protaper® rotary systems and Reciproc® reciprocating in single rooted premolars. Materials and methods: An experimental type of research have been done in vitro, for wish sixty human single rooted premolar with similar characteristics, divided on three groups. Depending on the type of instrumentation the groups were divided on (n=20) manual step back, Protaper® y Reciproc® respect. Instrumentation have been done on each group agreed with the instructions of the fabricant. Independent on every technique, each one of them were irrigated with 1 ml of distillated water. The weight of collected debris was extruded using the method modified by Myers and Montgomery in 1991. Subsequently the sample is placed into the incubator (Gravity Convection Incubator, Model Economy 2EG) at 37° C for seven days. After the debris was weighed using an electronic balance (Balance Electronics Denver Instrument M-220D) with an accuracy of <0.0001 g. Results: Reciproc® produced less debris 0.0010 compared with other systems. No statistically significant difference was observed between the manual techniques and the Protaper® (p=0.1939). At the time to compare the three manual systems Step back, Protaper® and Reciproc®, statistically differences were found (p=0.0001) respect from the quantity of debris extruded. Conclusions: Every technique of instrumentation produces extrusion of the debris. This extrusion to the periapical region can cause inflammation and flare up after the treatment and can cause sings, however it depends of the quantity of debris extruded. In the present study the Protaper® extruded significantly more quantity of apical debris that the one in the instrumentation with Reciproc® and manual.
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    • Comparación in vitro de la microdureza superficial de dos resinas compuestas (Tetric® N- Ceram y Filtek™ Z 350XT) sumergidas en una bebida isotónica (Gatorade®) y una bebida energizante (Red Bull®)

      Hermoza Novoa, Mónica Mercedes; ; Castilla Minaya, Olga (Universidad Peruana de Ciencias Aplicadas (UPC)PE, 07/11/2015)
      Objective: Compare in vitro the microhardness of two composites resins (Filtek ™ Z 350xt and Tetric® N-Ceram) immersed in an isotonic drink (Gatorade®) and an energy drink (Red Bull ®). Materials and methods: The study was experimental in vitro. 44 composite resin blocks were prepared, which were divided into two groups according to trademark and, within these, by type of sports drink 11 specimens used to drink Gatorade® and Red Bull®. Resin blocks were stored in distilled water in an oven at 37 ° C. Initial microhardness was measured at 24 hours of ready-made. Subsequently, they were immersed in energy drinks for 10 minutes daily for 5 days and then proceeded to measure the final microhardness through the Vickers microdurometer. Results: An initial average 77.73 + 4.34 and 3.93 73.73+, and a final average of 54.27 + 4.29 and 3.59 52.64+ for Tetric® N-Ceram resin was found after being submerged to drink Red Bull® and Gatorade® respectively. Also, an initial average of 92.91 + 4.78 and 92.27+ 2.65, and a final average of 80.55 + 4.03 and 3.46 for 80+ Filtek ™ Z 350xt after immersion to the same drinks resin was found. In addition, statistically significant differences were found when comparing the surface microhardness of composite resins before and after immersing in beverages obtaining a p= 0.000. On the other hand, no statistically significant differences were found when comparing the decrease of microhardness of resins versus energy drinks. However, when comparing the two brands of composite resin statistically significant differences (p = 0.000) were seen. Conclusions: The decrease in surface microhardness of Filtek ™ Z xt 350 resin after being submerged for drinks Gatorade® and Red Bull® was lower compared to Tetric® N-Ceram resin.
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    • Evaluación de la edad cronológica según la edad dental a partir de la maduración de las terceras molares usando el método de Demirjian en pacientes de 13 a 24 años de edad en el periodo 2013

      Zuiko Felix, Alfredo; Zavaleta Rodriguez, Katya Rosemary (Universidad Peruana de Ciencias Aplicadas (UPC)PE, 07/11/2015)
      Objective: To correlate chronological age and third molar development using Demirjian method in patients from 13 to 22 years old attended at Clinica Docente UPC in the period from 2013 to 2014. Materials and Methods: The study design was observational, comparative, correlational, cross-sectional and retrospective. The population consisted of patients between 13 and 22 years old attended at Clinica Docente UPC in the period from 2013 to 2014. For purpose of this research, data was collected by convenience sampling. A total of 510 orthopantographys were used to evaluate the morphology of each third molar according to Demirjian method (A-H) and recorded in Excel as a data collection instrument. The sample was separated by age and gender. Results: A positive linear correlation between chronological age and third molar develoment was found of 0.796 and 0.799 for women and men respectively. Conclusions: A correlation was found between chronological age and third molar develoment.
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