INTRODUCTION A great number of studies performed in the last 3 decades have shown the superior mechanical features of nickel-titanium files as compared with stainless steel files. A novel file system recently developed, Gentlefile, defies these findings and claims to have superior qualities despite the fact it is made from stainless steel. METHODS Three file systems were used in this experime...

Endodontic flare-up or post-operative pain occurs when debris such as necrotic pulp tissue, dentin chips, irrigants, and microorganisms are extruded from the apical foramen intraoperatively into periradicular tissue during root canal instrumentation. This study compared amount of extrusion layer after using reciprocating rotary file systems (WaveOne, ProTaper Next Gold). Sixty extracted human m...

Aim: To evaluate the incidence of apical root crack formation after canal preparation using ProTaper Universal (PTU), Next (PTN) and Gold (PTG) rotary file systems compare at various instrumentation lengths. Subjects Methods: One hundred single rooted extracted mandibular premolar teeth were mounted in acrylic resin blocks simulating periodontal ligament. The divided into four groups. Group I w...

Objetivo: Comparar a formatação de canais simulados por dois instrumentos rotatórios: ProTaper Next (Dentsply Maillefer, Ballaigues, Suíça) e X-Gray após segundo uso. Materiais Métodos: Dezesseis blocos foram divididos em grupos: PTN (ProTaper Next) XG (X-Gray). Foi injetada tinta naquim nos simulados. Estes cobertos com papel laminado para que não haja influência na instrumentação. Antes da in...