and Taha Ozyurek et al., no significant differences have been reported in fracture resistance of the tooth prepared using CAC and traditional access cavities. This vital zone, nearly 4 mm above the crestal bone and extending 4 mm apical to the crestal bone, is imperative for three reasons: (a) fracturing, (b) ferrule, and (c) proximity of the dentin tubule orifice from inside to out. Although the coronal third of the clinical crown and the apex of the root can be amputated and prosthetically replaced, the dentin near the alveolar crest cannot. The dentin near the alveolar crest is known as PCD. Inspired by the minimally invasive dentistry concept, a conservative access cavity (CAC) has been designed which minimizes the removal of pulp chamber roof and peri-cervical dentin (PCD). In terms of clinical outcomes, these fractures may result in a poor prognosis of endodontic treatment and lower the long-term survival rate of the tooth. Extreme tooth structure loss due to trauma or caries, access cavity preparation and design, dryness of dentin, instrumentation with rotary files, excessive pressure during filling procedures, detrimental effects of irrigation solutions, and preparation for intra-radicular post space are all factors that affect the strength of root canal treated teeth and has been shown in studies to increase root fracture susceptibility.
The shaping, cleaning, and disinfection would allow for a three-dimensional obturation (3D) of the root canal system from a biomechanical standpoint.
Results: Root canal instrumented groups showed lower fracture resistance than the uninstrumented group.Ĭonclusion: Hence it could be concluded that endodontic instrumentation with increased taper rotary instruments caused a decrease in fracture resistance of the teeth, and biomechanical preparation of root canal system with rotary or reciprocating instruments caused a significant decrease in fracture resistance of endodontically treated teeth (ETT), thereby decreasing their prognosis and long-term survival.Įndodontic therapy consists of steps that aim to remove the contaminated pulp and dentin from the root canal and repair the periapical tissues that guarantee tooth functioning. Both experimental and control groups were subjected to fracture load using a conical steel tip (0.5mm) attached to a universal testing machine to record force applied in newton until root fracture. The canals were instrumented keeping an apical size of #30 by different taper rotary files: Group 1: un-instrumented (control group), Group 2: 30/.04, Group 3: 30/.06, Group 4: 30/.08 K3XF file system, and teeth were obturated using a 3-D obturation system, and access cavities were filled using composite. The access was opened, and working lengths were determined. Methodology: For the study, 80 freshly extracted human mandibular premolars with single well-developed roots without any curvatures were taken and the tooth roots were wrapped in a single layer of aluminum foil, and they were placed vertically in a plastic mold filled with self-curing acrylic resin. Aim: To compare the effect of different tapers of the K3XF file system on the fracture resistance of endodontically treated mandibular premolars obturated with a three-dimensional (3-D) obturation system.
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