Evaluation of The Effect of Diode Laser on Root Canal Disinfection, Canal Cleanliness, Fracture Resistance of Tooth Structure and Bond Strength to Root Canal Dentin An in Vitro Study

Abstract

The aim of this study was to assess and investigate the effect of diode laser on root canal disinfection, and root canal cleanliness, as well as its effect on the fracture resistance of tooth structure, and on the bond strength of resin sealer to the root canal wall. Materials and MethodsA total of 160 single rooted teeth were selected, and separated into two experimental groups (n=80), Group A were finally irrigated using 980 nm diode laser. Group B were finally irrigated using NaOCl/EDTA. Samples were evaluated for canal disinfection using the colony forming unit count, and Polymerase chain reaction. Samples were placed under scanning electron microscopic to evaluate the smear layer removal. A universal testing machine was used to test the resistance of teeth to fracture, and the bond strength of sealer to the root canal walls. ResultsGroup A showed higher bacterial reduction and better results in smear layer score than Group B. Also Group A presented higher fracture resistance than Group B, as well as better value of push out bond strength than Group B. ConclusionDiode laser is an efficient tool in bacterial reduction and smear layer removal when used as a final irrigation procedure, compared to NaOCl/EDTA.

Evaluation of Fracture Resistance of Bioceramic sealer with C points with and without laser activation (An In-vitro study)

“…In this study, the fracture resistance of root was found to be high after diode laser activation. This came in agreement with Quteifan et al (32) and Barakat et al (33) that accredited it to the fact that laser can glaze, melt, and recrystallize dentin, where such molten dentin layer solidifies and close slight transient surface cracking. In the opposite side a study by Ayrancı et al (34) stated that laser decreased the fracture resistance of dentin, this may be attributed to the difference in the study design and methods as the vertical root fracture resistance test was done on apicoected teeth, also they claimed that the decrease of fracture resistance might be due to alteration in structural composition of dentin.…”