title: A preliminary report on continuous recording of salivary pH using telemetry in an edentulous patient.
abstract: OBJECTIVE
  This study reports on the development and evaluation of a telemetry system for recording salivary pH.
  
  
  METHODS
  The system used an iridium-oxide pH sensor (Metoxy sensor) and was housed inside a mandibular complete denture. It transmitted the data using the AM band (radio frequency of 12.3 MHz) and had a maximum power output of approximately 1 mW with a 3-V lithium battery (capacity 190 mAh). For the clinical evaluation, a 69-year-old woman who was edentulous and had no systemic disease was the subject.
  
  
  RESULTS
  Under the conditions of the study, the system was able to operate for 19 hours. The maximum error of transmitted pH data values was pH 0.15 within the range from pH 5.0 to 9.0. The evaluation of the test subject showed that this system operated without problems, and that the pH levels responded appropriately.
  
  
  CONCLUSIONS
  The developed system was shown to successfully record salivary pH, and it functioned as expected in a single test subject.
authors.affiliation: Department of Oral Medicine and Orofacial Pain, University of Southern California at Los Angeles School of Dentistry 90095-1668, USA.
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: K
authors.initials: K
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Oizumi
authors.forename: G T
authors.initials: GT
authors.lastname: Clark
mesh_terms: D000368:Aged; D002138:Calibration; D003826:Denture, Complete, Lower; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D009066:Mouth, Edentulous; D011846:Radio Waves; D012463:Saliva / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D013686:Telemetry / Q000295:instrumentation*