title: A study of the relationship of maximal perioral muscle pressure and tonic resting pressure using a pneumohydraulic capillary infusion system.
abstract: The tonic (resting) and peak (maximum) lip pressures of 100 subjects were measured. The purpose was to evaluate the validity of the assumption that high peak pressures are indicative of high tonic pressures and vice versa. This paper describes the equipment and techniques devised to test these pressures. The results showed no statistically significant relationship whatsoever between tonic and peak lip pressures. We, therefore, suggest that maximum lip pressures not be used as a diagnostic aid in orthodontics.
authors.affiliation: New York University College of Dentistry, New York 10010.
authors.forename: E C
authors.initials: EC
authors.lastname: Lubit
authors.forename: M A
authors.initials: MA
authors.lastname: Wallach
authors.forename: R
authors.initials: R
authors.lastname: Schwalb
mesh_terms: D004867:Equipment Design; D005152:Facial Muscles / Q000502:physiology*; D006801:Humans; D006874:Hydrostatic Pressure; D008046:Lip / Q000502:physiology*; D008365:Manometry / Q000295:instrumentation / Q000379:methods; D009055:Mouth / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D009129:Muscle Tonus / Q000502:physiology; D011312:Pressure; D014160:Transducers, Pressure; D014867:Water
chemical_list: D014867:Water