Influence of working length and foraminal enlargement on foramen morphology and sealing ability

Abstract

Under the conditions of this study, it can be concluded that foramen enlargement resulted in more apical deviation; however, no differences in bacterial microleakage was observed among the experimental groups.

Evaluation of apical transportation and apical root sealing in root canals prepared with mtwo rotary system with and without apical enlargement – an in vitro study

“…Regarding samples of Group II, (1mm from the apical foramen), there was no statistically significant difference in the mean apical foramen diameter after instrumentation when compared to its condition before instrumentation. These results also were observed in previous study (Silva et al 2016), where enlargement of the apical foramen could not be observed when root canal preparation was performed 1mm from the apical foramen. These data are confirmed by previous studies (Chugal et al 2003;Endo et al 2011), which showed that enlargement of the apical foramen improved the cleaning and filling ability during root canal therapy.…”

“…In this case, the samples were prepared using rotary nickel-titanium Mtwo instruments, showing the last file a taper of 0.04mm and a diameter close to 40 and 45 k-file.This concept is in accordance with previous studies (Benatti et al 1985;Jara et al 2018;Brandão et al 2019), which demonstrated that this type of apical enlargement does not have interference in the periapical repair. Furthermore, according to previous study, this type of apical enlargement provides better adaptation in the interface between filling material and apical foramen (Silva et al 2016).…”

“…However, the absence of cleaning and organic tissue remnants could be observed in previous studies, when chemomechanical preparation was performed 1mm from the apical foramen (Wu et al 2000;Wu et al 2002). On the other hand, some studies revealed some undesirable apical enlargement effects such as higher postoperative pain (Silva et al 2017), higher extrusion of debris and filling material (Albuquerque et al 2020), higher apical deviation (Silva et al 2016) and foraminal deformation (Silva-Santos et al 2018). In the present study, apical morphology modification and apical transportation were evaluated after the use of two root canal preparation techniques, with or without apical foramen enlargement, followed by apical sealing evaluation after root canal sealing.…”

“…The success predictability of the root canal therapy does not depend only on the quality of instrumentation and filling, but also on complete elimination of organic substrate and microorganisms from the root canal, including the apical foramen area (Schilder 2006;Silva et al 2016). According to previous study, maintaining the patency of the apical foramen prevents the accumulation of pulp and dentinal debris, which can induce apical blockage, deviation, apical zip and root perforation (Mohammadi et al 2017).…”

Passive Ultrasonic Irrigation Efficacy in the Vapor Lock Removal: Systematic Review and Meta-Analysis

“…The amount of time dedicated to chemical cleaning has been drastically reduced. It is now preferred to minimally shape the apex, with the use of 7-8% tapered and 0.20-0.25 mm of diameter instruments at the tip, in order to get a more predictable apical gutta-percha sealing to the detriment of irrigants action and possible increasing procedures [20], although other studies seem to prove the contrary [28, 29]. We aimed to revise the literature, following inclusion criteria: studies performed on that have artificial canals and extracted teeth, preventively shaped.…”