American Board of Orthodontics (ABO) Practice Exam 2026 - Free Orthodontics Practice Questions and Study Guide

The presence of mucoid in saliva plays a significant role in the characteristics of plaque permeability. Mucoid, which is a mucous substance, contributes to the viscosity and thickness of saliva, influencing how easily ions and molecules can diffuse through plaque biofilms.

When mucoid is present, it can form a protective layer that reduces the diffusion of ions and other substances. This effect leads to decreased permeability of the plaque, making it more difficult for ions, nutrients, and water to penetrate. Consequently, this reduction in permeability can hinder the access of ions necessary for biological processes, such as remineralization and the maintenance of a balanced oral environment.

The effects on permeability associated with mucoid presence highlight the interplay between saliva composition and oral health, particularly in the formation and stability of dental plaque. In contrast, other options would not adequately reflect the interaction of mucoid with plaque structures or its physiological implications in oral environments.