Influence of different high power laser irradiation parameters on bond strength between lithium disilicate ceramic and resin cement

• Grant number: 14/04693-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): July 01, 2014
• Effective date (End): June 30, 2015
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: César Rogerio Pucci
• Grantee: Danilo de Souza Andrade
• Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

The present study aims to determine which among different irradiation parameters of Nd:YAG laser is more suitable for the increased bond strength between ceramic di-lithium silicate (IPS e.max Press, IvoclarVivadent, Liechtenstein) and resin cement (Variolink II, IvoclarVivadent, Liechtenstein). For that 100 specimens of ceramic evidence in stem conical shape, with the largest base of 4mm in diameter and 2mm smaller base diameter and 4 mm in height, will be divided into 5 groups (n = 20), according to which treatment will be submitted: Control: is not irradiated with laser, just conditioning hydrofluoric acid 5 % for 1 minute and silanized; ND80: the area that will be subject to membership will be irradiated with Nd:YAG laser parameters 80mJ in energy intensity and 15 Hz frequency by 40 sec, with a constant cooling air, followed by acid etching hidrofluorídrico5 % for 1 minute and silanization; Nd100: the area that will be subject to membership will be irradiated with Nd:YAG laser parameters 100mJ of energy intensity and 15 Hz frequency for 40 sec, with a constant cooling air, followed by etching with hydrofluoric acid 5 % for 1 minute and silanization; Nd120: the area that will be subject to membership will be irradiated with Nd:YAG laser parameters 120mJ of energy intensity and frequency of 15 Hz for 40 sec, with a constant cooling air, followed by etching with hydrofluoric acid 5 % for 1 minute and silanization; Nd140: the area that will be subject to membership will be irradiated with Nd:YAG laser parameters 140mJ intensity energy and 15 Hz frequency for 40 sec, with a constant cooling air, followed by etching with hydrofluoric acid 5 % for 1 minute and silanization. After treatment of the specimens shall be cemented with resin cement at a constant load of 630g. The cemented joint will be subjected to simulated aging thermal cycling (1000 cycles) machine and then the mechanical tests will be performed in a universal testing machine EMIC-2000 (EMIC, São José dos Pinhais, Paraná, Brasil) at a constant speed of 1 0 mm / min, with a cell load of 50 kgf load which the specimen until fracture occurs, showing the maximum value in MPa supported by the interface ceramic / ceramic. Data will be analyzed using the test ANOVA and Tukey. (AU)