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• W853860288 abstract "To evaluate the quality of root canal preparation using two different mechanical NiTi systems. 40 maxillary and mandibular molars were selected. Specimens were randomly assigned to two groups and were scanned using a micro-computed tomography scanner before and after root canal preparation that was performed using ProFile instrument sequence and Reciproc single file technique. Each system was used to obtain an optimal apical size for each specimen, following common clinical guidelines. 3D models were reconstructed and evaluated for volume, areas and root canal axis. The total volume of dentine removed and the volume of the coronal, middle and apical thirds of each root canal were calculated, as well as the average deviation of the root canal axis at different levels and the values compared. Student t-test was used to determine the difference between the two experimental groups (P < 0.05). A qualitative evaluation of root canal preparation was also performed. No statistically significant differences were noted between the groups in the volume of dentine removed after root canal preparation, except for the volume of the coronal third (P < 0.05) and the volume of the apical third (P < 0.05) of the disto-buccal canal of maxillary molars and in the mesial canals of mandibular molars, where ProFile instruments produced significantly less enlarged canal volume in the apical third and more enlarged canal volume in the coronal third (P < 0.05). No statistically significant differences were found in the root canal axis deviation. Under the conditions of this study, both the systems analyzed were able to prepare molar teeth with similar amount of dentine removal and a relatively low risk of procedural errors. L’obiettivo del presente lavoro è stato quello di rendere possibile mediante l’uso di un software realizzato dagli Autori la visualizzazione e la quantificazione delle modifiche prodotte da diverse tipologie di strumenti endodontici sull’anatomia originale dei canali radicolari, utilizzando una analisi alla micro-tomografia computerizzata (MCT). 40 elementi dentari sono stati analizzati mediante l’uso di uno scanner micro-tomografico prima e dopo due tipologie di preparazione canalare, sequenza di strumenti Profile in approccio crown-down e Single Instrument Technique Reciproc. Dopo l’acquisizione un algoritmo appositamente sviluppato ha reso possibile la precisa sovrapposizione delle scansioni, in modo da poter apprezzare e misurare l’influenza delle procedure. Un altro algoritmo ha permesso il preciso riconoscimento della componente endodontica, così da poter calcolare e misurare lo spostamento del centro di massa dei canali e del relativo asse, la quantità e la percentuale della dentina rimossa dalla strumentazione e la localizzazione delle zone di contatto strumento/canale. Non ci sono state differenze statisticamente significative tra i due gruppi per la maggior parte dei parametri analizzati, eccetto che per il volume nel terzo coronale e per il volume del terzo apicale delle radici disto-buccali dei molari superiori e delle radici mesiali dei molari inferiori analizzati, dove il gruppo dei ProFile ha prodotto una maggiore rimozione di dentina nel terzo coronale e una minore nel terzo apicale. Non sono state riscontrate differenze statisticamente significative per il grado di deviazione dell’asse originale del canale radicolare (P < 0.05). Dai risultati emersi nel presente studio si evince che entrambi i sistemi analizzati sono in grado di realizzare preparazioni canalari adeguate e con un rischio relativamente basso di errori procedurali." @default.
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• W853860288 date "2015-06-01" @default.
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• W853860288 title "The impact of endodontic anatomy on clinical practice: a micro-CT study and tribute to Prof. Francesco Riitano" @default.
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• W853860288 doi "https://doi.org/10.1016/j.gien.2015.05.001" @default.
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