Below what degree of mouth opening is considered restricted?

In assessing restricted mouth opening related to Temporomandibular Joint (TMJ) dysfunction, a mouth opening of less than 40 mm is typically considered restricted. This measurement is derived from established clinical guidelines that indicate normal maximum mouth opening ranges from about 40 mm to 60 mm. Hence, an opening of 40 mm would not meet the criteria for being categorized as restricted, while anything below this threshold would indeed indicate a limitation in jaw function.

Normal opening allows for adequate movement necessary for activities such as eating, speaking, and oral hygiene. A range below this indicates a potential for TMJ disorders, muscular issues, or structural abnormalities within the jaw. Therefore, recognizing restricted mouth opening as anything under 40 mm is crucial for diagnosis and treatment planning.