A comparison of spreader penetration depth and load required during lateral condensation in teeth prepared using various root canal preparation techniques

Abstract

The flare created by canal preparation affected spreader penetration depth, but had no effect on the spreader load.

Potential Relationship between Design of Nickel-Titanium Rotary Instruments and Vertical Root Fracture

“…Factors that predispose a root to VRF have been extensively investigated and are considered reasonably well understood (20)(21)(22)(23)(24)(25). Canal filling procedures or loading in relation to posts are most frequently considered as VRF risks (21,22,26,27), but VRF may also originate from stress concentrations arising from the final canal shape, the extent of canal enlargement, and irregularities or ''defects'' along canal surfaces induced during clinical procedures (25). Shemesh et al (28) reported that canal preparation had created significant dentin defects such as fractures, craze lines, and incomplete cracks.…”

The effect of spreader size on fracture resistance of maxillary incisor roots

“…Dulaimi & Wali Al‐Hashimi (2005) compared the effect of four different preparation techniques on spreader penetration depth and load required during lateral compaction. Their study showed that the stepback technique with Gates‐Glidden drills resulted in the smallest distance between the initial spreader (same size as the master apical file 40) and the working length.…”

Un approccio critico alle tecniche di otturazione canalare

“…Per altri Autori però il range di tali forze, compreso tra 1-3 Kg, non risulterebbe dannoso per il dente né sarebbe da considerarsi causa diretta di fratture verticali [30][31][32][33] .…”