Treatment outcomes of regenerative endodontic procedures in nonvital mature permanent teeth: a retrospective study.

Objectives: This retrospective study was undertaken to clinically and radiographically evaluate the long-term outcomes of regenerative endodontic procedures (REPs) for nonvital mature permanent teeth, to analyze predictors influencing treatment outcomes.

Methods: Nonvital mature permanent teeth treated by REPs with a minimum follow-up period of 6 months were included from 2015 to 2017. Treatment outcomes were categorized as success and failure.

Experts consensus on the procedure of dental operative microscope in endodontics and operative dentistry.

The dental operative microscope has been widely employed in the field of dentistry, particularly in endodontics and operative dentistry, resulting in significant advancements in the effectiveness of root canal therapy, endodontic surgery, and dental restoration. However, the improper use of this microscope continues to be common in clinical settings, primarily due to operators' insufficient understanding and proficiency in both the features and established operating procedures of this equipment. In October 2019, Professor Jingping Liang, Vice Chairman of the Society of Cariology and Endodontology, Chinese Stomatological Association, organized a consensus meeting with Chinese experts in endodontics and operative dentistry.

Clinical and radiographic outcomes of regenerative endodontic procedures for traumatized permanent necrotic teeth with apical periodontitis and external root resorption.

Aim: This clinical study was undertaken to assess the effect of treatment with regenerative endodontic procedures (REPs) on 20 teeth with pulp necrosis, apical periodontitis, and external root resorption (ERR).

Methodology: Teeth were treated with REPS utilizing the American Association of Endodontists (AAE) protocol. Quantitative assessment of changes in radiographic root area (RRA) were statistically analysed to assess changes in root dimensions after an average follow-up period of 3 years.

Comparing accuracy after guide access and microscope-assisted access for fiber post removal.

Objectives: This study compared the accuracy of the guide-supported and the microscope-assisted fiber post removal systems by using the extracted teeth. These new idea and theory can be used by clinicians to remove fiber posts.

Methods: Twenty-eight human extracted premolars were randomly divided into the guide and microscope groups.

Regenerative Endodontic Procedures for Traumatized Immature Permanent Teeth with Severe External Root Resorption and Root Perforation.

External root resorption (ERR) is often a complication of traumatic injury to the teeth. Traditionally, external inflammatory root resorption is treated with calcium hydroxide. The outcome of ERR, especially replacement resorption, is unpredictable.

Oxidative potential of ambient PM in Wuhan and its comparisons with eight areas of China.

Oxidative potential (OP) is a good indicator for assessing health risk associated with exposure to fine particulate matter (PM, <2.5 μm in aerodynamic diameter). In this study, 24-h ambient PM samples were collected at three sampling sites throughout selected months of 2012 in Wuhan, Central China.

A hybrid source apportionment strategy using positive matrix factorization (PMF) and molecular marker chemical mass balance (MM-CMB) models.

The molecular marker-based chemical mass balance (MM-CMB) method performs well in the source apportionment of organic carbon (OC) but has some difficulty with contributions from primary sources to inorganic secondary ions when apportioning PM (particles with aerodynamic diameter of 2.5 μm or less) sources. Positive matrix factorization (PMF) with the input of inorganic and organic tracers can properly estimate the contributions of primary and secondary sources to inorganic secondary ions; however, PMF is unable to apportion several PM sources with large fractions of organic carbon and few elemental compositions.

[Contrasting study of erythritol and xylitol on Streptococcus mutans].

Objective: To study the inhibitory effect of erythritol by contrast to xylitol on growth and acid production of Streptococcus mutans (S. mutans).

Methods: S.