he aim of this study was to evaluate the apical displacement produced by different rotary nickel-titanium instruments, testing the hypothesis that rotary systems with nickel-titanium instruments produce lower mean values of apical displacement than stainless steel hand instruments. A total of 100 maxillary permanent first molars were selected for the study. The mesiobuccal roots were sectioned ...

The study investigates the relationship between electricity trade and economic growth in South Africa. utilised time series data spanning from 1985 to 2022 collected secondary sources like Quantec. employed DF-GLS KPSS unit root, ARDL Bounds cointegration test, ECM model, Granger causality residual diagnostics tests. discovered presence of short long run negative relationships revealed unidirec...

This study investigated the influence of cross-section profile on the mechanical behaviors of six commercial nickel-titanium (NiTi) root canal instruments using the finite element method. The nonlinear mechanical characteristics of the NiTi alloy were taken into account. The six root canal instruments studied were ProTaper, Hero642, Mtwo, ProFile, Quantec, and NiTiflex. Mathematical models for ...

The purpose of this study was to analyze the type and frequency of defects in nickel-titanium rotary endodontic files after routine clinical use, and to draw conclusions regarding the reasons for failure. All of the files (total: 378, Quantec Series 2000) discarded after normal use from a specialist endodontic practice over 6 months were analyzed. Almost 50% of the files showed some visible def...

The 1991 “Emami paper”1 summarized dose/volume/outcome estimates for normal tissues as part of a full issue the International Journal Radiation Oncology, Biology, Physics (IJROBP) dedicated to report an NCI-funded Collaborative Working Group on Evaluation High Energy Photon External Beam Treatment Planning. It guided and informed many providers helped countless patients in early years 3D planni...