Canal Access, Instrumentation, Irrigation-Access

Summary:  Purpose: to determine if reusing ProTaper rotary instruments up to five times increases their separation incidence. Materials/Methods: •N = 4652 (Treatment/Retreatment Cases) •Treatments were done over a 17-month period by 5 endodontists •Coronal flaring and glide path. WL determination. By EAL. •In retreatment cases, removal of GP with solvent GG and hand files. •Instrumentation […]

Summary:  •Purpose: to evaluate the incidence of nonretrievable instrument separation, when using the LightSpeed system by 3rd and 4th  year dental students  •N= 3543 canals over a 24-month period •Materials/Methods: •Lightspeed was used according to the manufacturer instructions. Preflaring with G.G, instrumentation to WL to size 20. Lightspeed used at speed of 2000 rpm and […]

Summary:  •Purpose: to prospectively determine the incidence of nickel–titanium rotary instrument fracture in an endodontic clinical practice setting. •N= 1403 teeth (354 anterior, 320 premolar, 729 molars) •Materials/Methods: •11 residents had to do all their cases with 1 system during the study. 3 used ProFile, 3 Protaper,3 K3 and 2 GT rotary . •Torque 3, […]

Summary:   Purpose: To analyse the type and frequency of Profile fracture and the ability  to bypass them in molar teeth Materials/Methods:  •n:  1457 Mandibular 1st and 2nd Molars with a prespecified criteria •3 angled PA radiograph were taken •2 endodontist treating 15-45 years old patients with Profile .04  (same Profile used for 5 molars) using crown […]

Summary:   Purpose: to compare the kinematic effect of NiTi instruments with reciprocating motion(R) and continuous rotation (CR) motion in cyclic fatigue resistance, shaping ability for canal transportation, apical debris extrusion, and dentinal defects or cracks Materials/Methods:   •Inclusion criteria were stated •Electronic search in MEDLINE data base and hand searching •n:  12 studies for cyclic […]

Summary:  •Purpose:  To describe a novel canal preparation technique using only one Ni-Ti rotary instrument •Technique: • •Canal negotiation with #8 file, in severely curved canals to #10 or #15. •CW and the CCW rotations are set on the motor at 4/10 and 2/10 of a circle. speed is set at 400 rpm. •F2 protaper […]

Summary:  Purpose: To provide a detailed analysis of the literature concerning the correlation between different movement kinematics and the cyclic fatigue resistance of NiTi rotary endodontic instruments. Materials/Methods: N=20 articles were included (qualitative synthesis comparing both reciprocating and continuous movements to cyclic fatigue of the instruments) after comprehensive and systematic searching of the Medline (PubMed), […]

Summary:  Purpose:  to investigate cyclic flexural fatigue resistance of GT series X rotary files made from the newly developed M-wire nickel-titanium alloy compared with GT and Profile nickel-titanium files made from a conventional nickel-titanium alloy. N= 15 files of each type , size 30/04. Materials/Methods: -A simple device was specifically constructed to measure the time […]

Summary:  Purpose: To evaluate the elemental composition, micro-structure and hardness of Ni-Ti endodontic instruments and to assess the relevance of shape memory and superelastic properties. N= 5 instruments per brand (Table 1). •After embedding the Ni-Ti instrument along their longitudinal axis in resin and metallographic preparation the elemental composition, structure and hardness were evaluated. •SEM/energy-dispersive […]

Summary:  Purpose: to test the hypothesis that multiple sterilizations of endodontic stainless-steel and nickel-titanium files will lead to a continuous deterioration in the hardness and torsional strength of the files N= 100 stainless-steel & 100 nickel-titanium #30 K-type files Materials/Methods: •Files were divided into 20 groups of 10 & sterilized in increments of 10 cycles, […]