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Defects in rotary nickel-titanium files after clinical use.
TLDR
The results indicated that torsional failure, which may be caused by using too much apical force during instrumentation, occurred more frequently than flexural fatigue, which might result from use in curved canals.
Load and strain during lateral condensation and vertical root fracture.
TLDR
The results suggest that lateral condensation alone should not be a direct cause of vertical root fracture, and the use of finger spreaders, however, is associated with lower risk.
Patterns of vertical root fracture: factors affecting stress distribution in the root canal.
TLDR
Finite-element models demonstrated that canal curvature seems more important than external root morphology, in terms of stress concentration, and that reduced dentin thickness increases the magnitude but not the direction of maximum tensile stress.
Effect of root canal size and external root surface morphology on fracture susceptibility and pattern: a finite element analysis.
The aim of the study was to determine the extent to which canal size, radius of curvature and proximal root concavity influence fracture susceptibility and pattern. A standardized cross-section of
Finite element analysis and strain-gauge studies of vertical root fracture.
TLDR
Finite element analysis indicated that circumferential tensile stresses were concentrated on the buccal and lingual surfaces of the canal wall, corresponding to areas of greatest canal wall curvature.
Microshear bond strength of resin composite to teeth affected by molar hypomineralization using 2 adhesive systems.
TLDR
The microshear bond strength of resin composite bonded to hypomineralized enamel was significantly lower than for control enamel, supported by differences seen in etch patterns and at the enamel-adhesive interface.
Fracture strength and fracture patterns of root filled teeth restored with direct resin restorations.
TLDR
Direct restorations increased fracture resistance of root filled teeth with extensive endodontic access and increased the strength of prepared teeth particularly in teeth without axial walls.
Physicochemical Characterization of Casein Phosphopeptide-Amorphous Calcium Phosphate Nanocomplexes*
TLDR
Detailed investigations of calcium and calcium phosphate binding using a library of synthetic homologues and analogues of the casein phosphopeptides have revealed that although the fully phosphorylated seryl-cluster motif is pivotal for the interaction with calcium and phosphate, other factors are also important.
Torque during canal instrumentation using rotary nickel-titanium files.
TLDR
The torque at failure was significantly (p < 0.001) higher than torque during instrumentation, but with considerable variation in the extent of the difference, which was greater in small than in medium canals.
Strain patterns in cervical enamel of teeth subjected to occlusal loading.
TLDR
The asymmetric pattern of strains in buccal cervical enamel in response to oblique occlusal forces is consistent with the common clinical picture of asymmetric non-carious cervical lesions.
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