Tooth anatomy risk factors influencing root canal working length accessibility.

The aim of this study was to analyze the specific influence of root canal anatomy on the accessibility of working length during root canal therapy. Four hundred seventy-six root canal therapy cases (amounting to a total of 1 005 root canals) were examined. The anatomy risk factors assessed in each case included: tooth type (tooth location), root canal curvature, and root canal calcification, as well as endodontic retreatment.

[The clinical analysis on the effects of different difficulty in root canal preparation].

Objective: To investigate the effects of root canal preparation treated by endodontists of different levels in different difficulty associated with the root canal anatomy factors.

Methods: Totally 422 teeth with 901 root canals were randomly selected from the Conservative Dentistry Department, West China Stomatology Hospital, and these teeth were respectively treated by junior specialist postgraduates, senior specialist postgraduates and endodontic specialists. Grading criteria of root canal risk factor and root canal therapy difficulty assessment were found based on 6 items: Tooth type, working length, root curvature, calcification, number of canals, and the previous endodontic treatment.

[The antibacterial efficacy of KaVo KEY laser on Enterococcus faecalis within infected root canals and roots surface in vitro].

Objective: To evaluate the antibacterial efficacy of KaVo KEY laser on Enterococcus faecalis (E. faecalis) within infected root canals and roots surface in vitro.

Methods: Fifty single-rooted teeth were selected, and infected root canals and roots surface vitro models were prepared.

[Anatomic study of canal isthmuses of mandibular permanent incisors by micro-CT].

Objective: To investigate the anatomic feature of the canal isthmus of mandibular permanent incisors by Micro-CT.

Methods: Thirty-three mandibular permanent incisors with two canals were selected through the radiograph in proximal view. These teeth were then scanned using Micro-CT and reconstructed.

Radiographic investigation of frequency and degree of canal curvatures in Chinese mandibular permanent incisors.

Accurate knowledge of root canal curvature is a critical factor in successful root canal procedures. The objective of this study was to determine the degree of root canal curvature and the frequency of curvature identified in different radiographic views in permanent incisors from a Chinese population. The curvature of canals from 299 permanent mandibular incisors was investigated by measuring the angle, the radius of curvature, and the length of the curved part of the canals.