Associations between different triglyceride glucose index-related obesity indices and periodontitis: results from NHANES 2009-2014.

Background: This study aimed to explore the associations between triglyceride glucose (TyG) index-related obesity indices and periodontitis within the American population.

Methods: This cross-sectional investigation utilized data from the National Health and Nutrition Examination Survey (NHANES) for 2009-2014. The association between the TyG-waist-to-height ratio (TyG-WHtR), TyG-weight-adjusted-waist index (TyG-WWI), TyG-waist circumference (TyG-WC), or TyG-body mass index (TyG-BMI) and periodontitis was investigated utilizing multivariable logistic regression model, subgroup, and dose-response curve analyses.

[An in vitro study on taper of single root canal of mandibular second premolars of 13-23 year-old people].

Objective: To determine the root canal initial taper of mandibular second premolars of 13-23 year-old people by using Micro-CT.

Methods: 23 extracted, single root, human root canal of mandibular second premolars of 13-23 year-old people were selected. The teeth were embedded in resin.