The Williams appliance was developed by Dr. Jeff Williams who practices orthodontics and pediatric dentistry in Bartlett, Tennessee, USA. The appliance was originally designed to be used on the mandibular arch in the mixed dentition. The two basic objectives of the appliance are to develop the transverse width of the lower dental alveolar base, and to recover any lost mandibular arch length.
The typical rate of activation is one (1) every 5-7 days. Each RPE requires four (4) activations per 1mm. It is Not uncommon to double up with one turn in the morning and one in the evening. Going too fast may damage periodontal membrane or roots of the teeth. Going too slow may result in producing more dentoalveolar change and less sutural split than normally desired. This appliance should be cleaned every day with toothpaste and a soft toothbrush, morning and night. Encourage the patient to give sufficient time to clean thoroughly around the appliance, gums, teeth, and bands to maintain proper hygiene and prevent inflammation. 3 minutes is recommended.