Knowledge, application and how about competence? Qualitative assessment of multiple-choice questions for dental students.

: Many medical schools train their faculty members to construct high cognitive level multiple choice questions (MCQs) that demand a great deal of analytical and critical thinking, application, and competence. The purpose of this study is to determine the cognitive levels of MCQs by using Moore's Expanded Outcomes Framework and to understand whether the quality of MCQs has an effect on students' assessment performance.: Four trained faculty members analysed 100 randomly selected questions developed at the University Clinic of Dentistry (UCD) and 100 questions developed by the National Board of Dental Examinations (NBDE).

Comparison of Bleaching Products With Up to 6% and With More Than 6% Hydrogen Peroxide: Whitening Efficacy Using BI and WI and Side Effects - An Study.

The aim of this study was to evaluate the effect of bleaching agents containing different concentrations of hydrogen peroxide (HP) on color-change and on enamel-surface in bovine teeth. Furthermore the influence on cell viability and proliferation was investigated. Two hundred and forty teeth were randomly assigned into four groups (home bleaching ≤6%, in-office bleaching ≤6%, in-office bleaching > 6% HP, and control group).

Influence of two different cement space settings and three different cement types on the fit of polymer-infiltrated ceramic network material crowns manufactured using a complete digital workflow.

Objectives: The study evaluates the influence of two spacer settings and three resin luting materials on the marginal and internal fit of polymer-infiltrated ceramic network (PICN) material crowns manufactured using a complete digital workflow.

Methods: Optical impressions of fifty identical dies were performed using the 3M scanner (software version 5.0.

Effect of two different primers on the shear bond strength of metallic brackets to zirconia ceramic.

Background: In view of the increasing demand of adult orthodontics for esthetic purposes, adult treatment with brackets has become an important issue. One essential factor for the quality of such treatment is bracket bonding on ceramics. For testing the adhesive bond between the bracket and the ceramic surface it is important to consider the static or cyclic loading that goes along with it.

Micro-CT evaluation of marginal and internal fit of cemented polymer infiltrated ceramic network material crowns manufactured after conventional and digital impressions.

Purpose: Purpose of this study was to evaluate the accuracy of fit of cemented polymer infiltrated ceramic network (PICN) material crowns manufactured after digital and conventional impression techniques using micro computed tomography (CT). Furthermore to determine the cement space volume and porosities in the cement layer.

Methods: A molar typodont tooth was prepared for PICN material crowns and replicated thirty times.

Shear bond strength of different materials used as core build-up to ceramic.

Purpose: To determine the performance of a resin composite material specially developed for core build-ups in comparison with conventional restorative materials.

Methods: 90 roughened ceramic blocs were divided into three groups; one group (n=30) was used for the core build-up material (Gradia Core) and the other two groups (n=30, each) were used for two conventional restorative materials (Tetric EvoCeram, Compoglass F). After adhesive fixation, specimens of each material were subdivided in accordance with the storage conditions (thermocycling or water storage).

Hypoxia-based strategies for regenerative dentistry-Views from the different dental fields.

The understanding of the cell biological processes underlying development and regeneration of oral tissues leads to novel regenerative approaches. Over the past years, knowledge on key roles of the hypoxia-based response has become more profound. Based on these findings, novel regenerative approaches for dentistry are emerging, which target cellular oxygen sensors.

Comparison of marginal fit of cemented zirconia copings manufactured after digital impression with lava™ C.O.S and conventional impression technique.

Background: Evaluation of the marginal fit of cemented zirconia copings manufactured after digital impression with Lava™ Chairside Oral Scanner in comparison to that of zirconia copings manufactured after conventional impressions with polyvinyl siloxane.

Methods: A prepared typodont tooth #36, was replicated 40 times with a vinyl silicone and precise model resin. The dies were randomly divided into two groups according to the impression taking technique.

Evaluation of the Morphological Characteristics of Laser-Irradiated Dentin.

Objective: The aim of this study was to investigate the effect of different energy settings of Er:YAG laser irradiation on dentin surface morphology with respect to the number of opened dentinal tubules.

Background Data: An ideally prepared dentin surface with opened dentinal tubules is a prerequisite for adhesive fixation. No study, however, has yet compared the numbers of opened dentinal tubules with regard to statistical differences.