Rubric for peer evaluation of oral presentations: Use and perceptions among experienced and non-experienced students.

Purpose: A properly designed rubric for oral presentations should be useful both to assess students' performance and to help them prepare for the task. However, its use and perceptions might be influenced by scholars' previous familiarization with rubrics during pre-university courses. The aim of this study was to evaluate how the previous experience of students in the use of rubrics can influence their assessment of oral presentations and to compare their ratings with those assigned by educators.

Performance of obturation techniques in anatomical irregularities located at different thirds of the root canal system.

This study aimed to compare the quality of root canal obturation (ratio of area occupied by gutta-percha (G), sealer (S), and presence of voids (V)) in different anatomical irregularities (intercanal communications, lateral irregularities, and accessory canals) located at different thirds of the root canal system of mandibular molar replicas. Sixty-seven 3D printed replicas of an accessed mandibular molar were prepared using ProGlider and ProTaper Gold rotatory systems. Three specimens were randomly selected to be used as controls and did not receive further treatment.

Influence of the incorporation of small-group practical seminars to a traditional lecture for the understanding of root canal morphology classification systems.

Introduction: This study aimed to assess if the incorporation of small-group practical seminars into a traditional lecture format improved the understanding and learning of the root canal classification systems in undergraduate students.

Materials And Methods: A small-group practical seminar was designed for 3rd year undergraduate students. The seminar consisted of the analysis of a guided summary of root canal morphology classifications, a participative discussion of several cases and drawing exercises of several internal anatomies based on the different classifications in templates presenting the external anatomy of different dental groups.

Effect of exposure to etidronic acid on the bond strength of calcium silicate-based cements after 1 and 21 days: an in vitro study.

Background: After reparation of root perforations with calcium silicate-based cements (CSBC), the surface of the material is expected to be exposed to root canal irrigants (RCI) while resuming the root canal treatment.

Methods: The aim of this study was to compare the effect of exposure to a mixture of sodium hypochlorite (NaOCl) and etidronic acid (HEBP) or other irrigants on the Push Out Bond Strength (POBS) of CSBC after two different setting times. 240 root slices 1 mm thick were obtained from single-rooted human teeth.

Effect of exposure to root canal irrigants on the push-out bond strength of calcium silicate-based cements.

Objectives: The aim of this study was to compare the push-out bond strength (POBS) of three calcium silicate-based cements (CSBC) after exposure to saline, sodium hypochlorite (NaOCl), ethylenediaminetetraacetic acid (EDTA), and a mixture of NaOCl and etidronic acid (NaOCl+HEBP) in simulated perforation.

Materials And Methods: A total of 180 dentin slices were perforated and then filled with either Biodentine (BD), ProRoot MTA (PMTA), or Total Fill (TF). After 1 week, specimens in each group were divided into 4 subgroups (n = 15) according to the root canal irrigant (RCI) that their coronal surface was exposed to: saline, 5.

Influence of humidity and setting time on the push-out strength of mineral trioxide aggregate obturations.

The aim of this study is to assess how a wet environment curing affects the retention characteristics of mineral trioxide aggregate (MTA), and also to determine the time needed for curing. MTA obturations were carried out in perforated dentine slices and cured under different conditions (presence or absence of humidity and several time intervals). The obturations were then subjected to an increasing mechanical strength until they were displaced from the perforations.