[Patient satisfaction after mandibular orthosis fitting by teleconsultation]. / Satisfaction des patients après réglage des orthèses mandibulaire par téléconsultation.

INTRODUCTION: Since the COVID-19 crisis, we have all had to apply telemedicine. As an example, we offered patients teleconsultations for titration of their mandibular advancement device for sleep apnea. The main objective of this study was to determine patient satisfaction with this new method of consultation. METHODS: A cross-sectional survey using a satisfaction questionnaire was carried out in patients having been given an appliance adjustment teleconsultation by our establishment between March 2020 and February 2021. RESULTS: Adjustment of their orthosis by telemedicine was systematically proposed to seventy-five patients, of whom seventeen accepted (22.7%), with a mean age of 52.3 years. The consultations were short (mean duration: 5min), and more than a third were carried out at the patient's workplace; by and large, they were considered highly satisfactory (mean score 4.3/5). CONCLUSION: Although appliance adjustment by teleconsultation was not overwhelmingly accepted when offered, it gave great satisfaction after performance. This type of consultation is both technologically and administratively easy to organize, and it can be proposed as a supplementary service, suitable for all ages.

Characterization of multilayered piezoelectric ceramics for high power transducers.

In some circumstances, large vibrational displacements at ultrasonic frequency must be generated using a low voltage drive. This result cannot be obtained with monolithic PZT ceramics which require voltages larger than 1000 V to produce displacements of the micrometer order at resonance. The use of multilayered hard lead zirconate titanate ceramics as transduction material in resonant devices is experimentally investigated for Langevin-type transducers. Large amplitudes are obtained under low drive (5 microm under 10 V). Material constant (compliance, losses) variations under large dynamic stress are, at least, one order of magnitude larger than for monolithic ceramics. Depolarization is found to be a critical issue when the transducer is driven continuously. It is demonstrated that this problem can be solved by polishing the interfaces between different parts of the device and applying an electrical DC bias to the transducer.