The prevalence, characteristics, and risk factors of external cervical resorption: a retrospective practice-based study.

Objectives: External cervical root resorption (ECR) is a poorly understood and aggressive form of resorption. The purpose of this study was to examine the prevalence, characteristics, and risk factors associated with the occurrence of ECR in patients seeking endodontic care from private practice settings.

Materials And Methods: Records of 343 patients with 390 teeth diagnosed with ECR were identified from 3 private endodontic practices from 2008 to 2022.

ProFile Vortex instruments after clinical use: a metallurgical properties study.

Introduction: The aim of the study was to analyze the incidence and mode of ProFile Vortex instrument (Dentsply Tulsa Dental Specialties, Tulsa, OK) defects during a predefined schedule of clinical use by the undergraduate students in a dental school setting and to examine the metallurgical characteristics of unused and clinically used Vortex instruments.

Methods: A total of 2,203 ProFile Vortex instruments discarded after single use from the undergraduate students program over 24 months were collected and examined for defects using a stereomicrosocpe at 10× magnification. The incidence and type of instrument defects or separation were analyzed.

Prevalence of internal inflammatory root resorption.

Introduction: Internal inflammatory root resorption is regarded as rare because it is only occasionally detected in clinical or radiographic examination of teeth. However, inflammation is supposedly an important etiologic factor of internal resorption. Therefore, we tested the hypothesis that there is no difference in the presence of internal resorption between teeth with vital, healthy pulp and teeth with a history of pulp inflammation.

Proinflammatory cytokine profiles in pulp fibroblasts stimulated with lipopolysaccharide and methyl mercaptan.

Pulpal disease is intimately associated with the immune system's response to bacteria products. Clinical pathology is mediated in part by the production of pyrogenic cytokines, especially interleukin (IL)-1, tumor necrosis factor (TNF)-alpha, and IL-6. Methyl mercaptan (CH3SH), a volatile sulfur compound produced by anaerobic Gram-negative bacteria, has been shown to contribute to the production of IL-1 by human mononuclear cells.