Canal Transportation and Volumetric Dentin Removal Abilities of Ni-Ti Rotary File Systems in Curved Primary Root Canals: CBCT Study

Abstract

Current improvements in nickel–titanium (Ni–Ti) rotary file systems have created a paradigm shift in the root canal therapy of primary teeth. Therefore, it is necessary to perform a comprehensive evaluation regarding the efficiencies of newly manufactured instruments for different parameters. The current study was conducted to evaluate the abilities of RaceEvo, R-Motion, ProTaper Gold (PTG) systems in curved primary root canals with regard to the patterns of canal transportation and volumetric dentin removal by using cone-beam computed tomography (CBCT). Two experimental sets were designed following the determination of experimental groups by using pre- and post-operative CBCT data: canal transportation and volumetric dentin removal. The highest amount of canal transportation was significantly detected in the PTG group in comparison to RaceEvo and R-Motion groups. When the mean values of volumetric dentin removal data were analyzed across all groups, the PTG group again exhibited the significantly highest value of dentin removal volumetrically, compared to RaceEvo, R-Motion and manual instrumentation groups. It is possible to state that R-Motion and RaceEvo rotary systems could be used as reliable alternatives without causing adverse mechanical effects and maintaining the original root canal anatomy of curved primary root canal systems compared with PTG rotary systems and manual instrumentation, with a high diagnostic sensitivity of CBCT in pediatric endodontics when the alternative methods are not adequate.

Comparative assessment of cleaning efficacy of two exclusive paediatric rotary files in root canals of primary teeth: An in vitro study

“…This insinuates that the maximum volume of dentine was removed by H files when compared with the other two NiTi rotary file systems. Islam et al 20 . and Barasuol et al 21 .…”

“…This insinuates that the maximum volume of dentine was removed by H files when compared with the other two NiTi rotary file systems. Islam et al 20 and Barasuol et al 21 also checked the incidences of canal transportation with NiTi rotary files in comparison with hand files along with volumetric dentine removal. Both these studies found NiTi files to be a suitable and more efficient alternative to hand filing, which falls in line with the conclusions of similar studies carried out by other authors [22][23][24] ; it is, however, worth mentioning that these studies did not include any exclusive paediatric rotary files in their studies.…”

Comparative evaluation of canal transportation, centering ability, and remaining dentin thickness between Race Evo and Protaper Next Rotary systems by using CBCT in mesial curved root canals of mandibular molar teeth (A comparative inVitro Study)

“…However, there is no published research on the three-dimensional (3D, e.g., volumetric) and two-dimensional (2D, e.g., canal transportation) e ciency of this newly developed rotary system on primary curved root canals. Thus, it is vital to evaluate relevant parameters, shaping quality, canal transportation, canal straightening, and unneeded hard dental tissue reduction during the curved root canals preparation in order to conduct successful long-term clinical trials using minimally invasive dentistry (14).…”

Comparação entre lima manual de níquel-titânio (SMF ®) e instrumentação mecanizada com diferentes cinemáticas (WOG ® e SBF ®) em molares decíduos prototipados: um estudo in vitro

“…17 O tempo efetivo de instrumentação para os grupos mecanizados foi menor quando comparado aos grupos manuais, corroborando com os estudos de Mehlawat, et al 18 instrumento possui um efeito proporcional ao desvio radicular. 30,31 Nos demais grupos estudados, com instrumentos de conicidades menores, recomendadas para os dentes decíduos, devido ao seu alargamento no terço apical e maiores taxas de transporte de canais radiculares curvos, os resultados foram satisfatórios. 32,33 A quantidade de resina remanescente demonstra o desgaste das paredes dos canais após a instrumentação, indicando o nível de força empregado, que é proporcional ao nível de resina restante.…”