26 research outputs found
LPS levels in root canals after the use of ozone gas and high frequency electrical pulses
Epidemiological evaluation of apical periodontitis prevalence in an urban Brazilian population
Root Canal Anatomy of Maxillary and Mandibular Teeth
It is a common knowledge that a comprehensive understanding of the complexity of the internal anatomy of teeth is imperative to ensure successful root canal treatment. The significance of canal anatomy has been emphasized by studies demonstrating that variations in canal geometry before cleaning, shaping, and obturation procedures had a greater effect on the outcome than the techniques themselves. In recent years, significant technological advances for imaging teeth, such as CBCT and micro-CT, respectively, have been introduced. Their noninvasive nature allows to perform in vivo anatomical studies using large populations to address the influence of several variables such as ethnicity, aging, gender, and others, on the root canal anatomy, as well as to evaluate, quantitatively and/or qualitatively, specific and fine anatomical features of a tooth group. The purpose of this chapter is to summarize the morphological aspects of the root canal anatomy published in the literature of all groups of teeth and illustrate with three-dimensional images acquired from micro-CT technology.info:eu-repo/semantics/publishedVersio
Picosecond laser ablation of dentine in endodontics
The interaction of picosecond laser radiation with human dental tissue
was investigated in this study, in order to determine the ablation rates
and the surface characteristics of the dentine by using scanning
electron microscopy (SEM). Dentine ablation was performed by using tooth
sections of different thicknesses (0.5-2.0 mm). Dental tissue samples
were irradiated in air with the fundamental wavelength and first
harmonic of a regenerative amplifier Nd:YAG laser system, at 1064 nm and
532 nm, respectively, with a pulse duration of 100 ps and a pulse
repetition rate of 10 Hz. The results showed very clean craters
surrounded by minimum melting of the surface of dentine when the 1064 nm
pulses were used. in contrast, when the first harmonic 532 nm pulses
were used, the SEM examinations revealed cracks and melting of dentine
with irregular surface modification. Consequently, it seems that
cleaning and shaping of the foot canal walls during endodontic therapy
with the picosecond Nd:YAG laser application may be possible in the
future. The, as yet unexplored, field of the picosecond laser
interaction with hard dental tissue is expected to be a potential
alternative for powerful laser processing of biomedical structures