Abstract
Objectives: To evaluate “in vitro” the degree of marginal leakage in class V cavities irradiated with Nd:YAG laser onto enamel and dentin pretreated with bonding system (Single Bond, 3M ESPE) without light-curing. Material & Methods: Class V cavities were performed and standardized in 60 bovine incisors. After the acid etching, the teeth were divided into three groups: G1 – Application of bonding system, irradiation with Nd:YAG laser at 140 mJ/pulse without light-curing. G2 – Application of bonding system, irradiation with Nd:YAG laser at 200 mJ/pulse without light-curing. Group C - Application of bonding system and light-curing. Next, resin composite restorations were executed and thermocycled at alternated baths from 2 to 50 ºC (± 2 ºC), totalizing 500 cycles. To assess the microleakage, the teeth were submersed into 50% silver nitrate solution for 24 h, cut at 1 mm of thickness and analyzed through stereoscopy. The following leakage criterion scores were employed: 0 – none leakage; 1 – gingival or incisal wall; 2 – axial wall towards the pulp. Results : It was observed a high leakage frequency with score 1 among the experimental conditions. There was a higher predominance of score 2 leakage for control group at cementum. Concerning to enamel and cementum, Group C was similar to G1. By comparing control group with G2, and G1 with G2, it was verified statistically significant differences. Conclusion: The laser energy provided a reduction of the marginal leakage at enamel and dentin/ cementum; however, the energy density increase resulted in smaller marginal leakage at enamel and dentin/cementum.KeywordsNd-YAG Laser; Energy; Marginal leakage; Enamel; Dentin.
Highlights
The actions provided by laser technology meet their main barrier into tooth substrate
Neodymium laser has been applied for remodeling the soft tissues and blood coagulation [9], modifying the enamel and dentin surface [9], and desensitizing the dentin [10]
The first neodymium laser applications were executed prior to the application of the bonding system, so that most of the studies exhibited a reduction of the bond strength and increasing of the acid resistance in comparison with the non-irradiated cavities
Summary
The actions provided by laser technology meet their main barrier into tooth substrate. Among the several laser devices, the following ones have been employed in Dentistry: Nd:YAG, Er:YAG, Ho:YAG and CO2 [2,3,4,5,6,7] These have shown different wavelengths for the treatment of the tooth tissues (caries removal, sterilization of cavities and root canals, and hypersensitivity treatment) and bonding purposes [7,8]. The first neodymium laser applications were executed prior to the application of the bonding system, so that most of the studies exhibited a reduction of the bond strength and increasing of the acid resistance in comparison with the non-irradiated cavities. This occurred because of the property of this laser type which provokes the denaturation of the organic components of dentin by generation of heating and the obliteration of the dentinal tubules by melting and resolidification the inorganic content [4]
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