OBJECTIVE: This study evaluated the degree of conversion (DC), maximum rate of cure (Rpmax), and polymerization stress (PS) developed by an experimental dental composite subjected to different irradiant energies (3, 6, 12, 24, or 48 J/cm2) under constant irradiance (500 mW/cm2). METHODS: DC and Rpmax were monitored for 10 min on the bottom surface of 2-mm thick disks and on 150-microm thick films (representing the top of the specimen) using ATR-FTIR. PS was monitored for 10 min in 2-mm thick disks bonded to two glass rods (Ø=5mm) attached to a universal testing machine. One-way ANOVA/Tukey tests were used and differences in DC and R(p)(max) between top and bottom surfaces were examined using Student's t-test. Statistical testing was performed at a pre-set alpha of 0.05. RESULTS: For a given surface, DC showed differences among all groups, except at the top between 24 and 48 J/cm2. Rpmax was similar among all groups at the same surface and statistically higher at the top surface. PS also showed significant differences among all groups. Data for 48 J/cm2 were not obtained due to specimen failure at the glass/composite interface. SIGNIFICANCE: Increases in irradiant exposure led to significant increases in DC and PS, but had no effect on Rpmax.
OBJECTIVE: This study evaluated the degree of conversion (DC), maximum rate of cure (Rpmax), and polymerization stress (PS) developed by an experimental dental composite subjected to different irradiant energies (3, 6, 12, 24, or 48 J/cm2) under constant irradiance (500 mW/cm2). METHODS:DC and Rpmax were monitored for 10 min on the bottom surface of 2-mm thick disks and on 150-microm thick films (representing the top of the specimen) using ATR-FTIR. PS was monitored for 10 min in 2-mm thick disks bonded to two glass rods (Ø=5mm) attached to a universal testing machine. One-way ANOVA/Tukey tests were used and differences in DC and R(p)(max) between top and bottom surfaces were examined using Student's t-test. Statistical testing was performed at a pre-set alpha of 0.05. RESULTS: For a given surface, DC showed differences among all groups, except at the top between 24 and 48 J/cm2. Rpmax was similar among all groups at the same surface and statistically higher at the top surface. PS also showed significant differences among all groups. Data for 48 J/cm2 were not obtained due to specimen failure at the glass/composite interface. SIGNIFICANCE: Increases in irradiant exposure led to significant increases in DC and PS, but had no effect on Rpmax.
Authors: Alessandra Cassoni; Juliana de Oliveira Ferla; Luis Gustavo Barrotte Albino; Michel Nicolau Youssef; Jamil Awad Shibli; José Augusto Rodrigues Journal: Lasers Med Sci Date: 2009-07-22 Impact factor: 3.161
Authors: Josiane Marques de Sena Popoff; José Augusto Rodrigues; Wanessa Maria De Freitas Aras; Alessandra Cassoni Journal: Photomed Laser Surg Date: 2014-04-07 Impact factor: 2.796
Authors: Razvan Ghinea; Oscar Pecho; Luis Javier Herrera; Ana Maria Ionescu; Juan de la Cruz Cardona; María Purificación Sanchez; Rade D Paravina; María del Mar Perez Journal: Biomed Eng Online Date: 2015-08-13 Impact factor: 2.819
Authors: Roberta Caroline Bruschi Alonso; Eduardo José Carvalho de Souza-Júnior; Diogo Dressano; Giovana Albamonte Spagnolo de Araújo; José Manuel Ces Rodriguez; Vinícius Di Hipólito; Camillo Anauate-Netto; Regina Maria Puppin-Rontani; Mario Alexandre Coelho Sinhoreti Journal: Eur J Dent Date: 2013-09