Salivary Cortisol and Salivary Flow Rate in Clinical Types of Oral Lichen Planus.

Patients with oral lichen planus (OLP) may develop immune sialadenitis that causes a dry mouth. The role of cortisol in autoimmune diseases is well known; yet studies on this subject are controversial. In this study, the salivary flow rate and salivary cortisol level were compared among subtypes of OLP.

Comparative Study of the Shear Bond Strength of Flowable Composite in Permanent Teeth Treated with Conventional Bur and Contact or Non-Contact Er:YAG Laser.

Introduction: The aim of this study was to evaluate and compare the in vitro effect of the Erbium-Doped Yttrium Aluminum Garnet (Er:YAG) laser with different radiation distances and high-speed rotary treatment on the shear bond strength of flowable composite to enamel of human permanent posterior teeth.

Methods: freshly extracted human molar teeth with no caries or other surface defects were used in this study (n=45). The teeth were randomly divided into 3 groups.