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Conventional Laser Endodontics

  • Chapter
Lasers in Endodontics

Abstract

Laser irradiation of root canals is performed with the conventional fibers or tips inserted into the canal up to the working length and successively activated during the retraction. This technique is suitable for most wavelengths used in dentistry. Medium-infrared wavelengths are well absorbed by water in the dentin and spread their energy superficially over the canal surface; they produce some thermal and ablative effect, clean the canal walls very well, vaporizing the smear layer, exposing the dentinal tubules, and increasing dentinal permeability. Near-infrared wavelengths are not well absorbed by the dentin chromophore and are more penetrating in depth; they produce evident thermal effects with areas of recrystallization of the dentin surface where the smear layer is mainly fused, occluding the dentinal tubules. All wavelengths have an efficient decontaminating action on the main canal surface, with different capacity of penetration in dentin tubules. However, a precise and unambiguous determination of the real bactericidal effect in depth of different lasers has not been reached and also many results are contradictory. When the diode lasers are used in conjunction with conventional irrigation techniques, significant elimination of bacteria is reported, and the morphological pattern produced remained similar to the pattern produced by the use of irrigant alone, limiting the undesired thermal effects correlated with near-infrared laser irradiation. However, the anatomic and operative problems of the introduction of a fiber in narrow and curved canals are still not solved, with the probable impossibility or inefficiency of the procedure in teeth with complicated root canal anatomy, not completely satisfying the needs of modern endodontics.

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Olivi, G., Olivi, M. (2016). Conventional Laser Endodontics. In: Olivi, G., De Moor, R., DiVito, E. (eds) Lasers in Endodontics. Springer, Cham. https://doi.org/10.1007/978-3-319-19327-4_6

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