Development of Indwelling Wireless pH Telemetry of Intraoral Acidity

A wireless intraoral pH telemetry system for salivary and plaque pH measurement was developed and examined. The actual size of intraoral pH telemeter unit is 8 mm x 16 mm x 2 mm including a rechargeable battery for more than 24 hours measurement. The unit was covered with polyurethane for waterproofing and was applied to the exterior teethridge of a volunteer. The intraoral acidity of the volunteer was successfully measured without interfering his daily life such as eating, drinking, speaking, and sleeping. The accumulated data in the telemeter unit was transferred to a light emitting diode on the surface of the unit and the emitted light was detected, decoded and transferred to the personal computer and analyzed.