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How to Achieve Good Lingual Extension with Hydrocast

Mandibular denture stability is often times a difficult challenge for us and also for patients.

For them to feel that a lower denture is stable and comfortable is very challenging, especially with ridges that are severely atrophic. One of the things that I have learned over my career is using HydroCast, which is a functional impression material. It is made by Sultan.

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And following Jack Turbyfill's techniques for this material has been the best way that I can achieve denture stability.

One of the challenges, though, is getting into the lingual flange area.

Hydro-Cast by SultanAnd the key to getting proper extension is starting with a really good overextended alginate impression. And once the denture base is fabricated, before I add the HydroCast, I will put the denture in the mouth and have the patient lift the tongue. If the denture base rises, then I know that my extensions are too long. So I adjust the extensions until that lifting does not occur, and then I apply the HydroCast material.

Ideally, you want about 3 mm of HydroCast on your denture flange borders. If you have more that that, if the material flows deeper, then it will have a tendency to flip and bend on you.

So there is acrylic that Sultan also makes to support the HydroCast. And once those proper lingual extensions are obtained, you will be amazed at how retentive and stable the denture can be.

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Dr. Daxon is a native of Fort Pierce, Florida and attended John Carroll High School. She received her Bachelor of Science degree in Chemistry from Stetson University in 1989 where she met her future husband, Patrick. Dr. Daxon graduated from the University of North Carolina School of Dentistry in Chapel Hill in 1993. Following graduation, she served a one-year general practice residency at Brigham and Women's Hospital in Boston and a two-year Prosthodontic residency at Harvard School of Dental Medicine and the Veterans Administration. Prior to starting Daxon and Grundset Dentistry, Dr. Daxon was a partner with the International Center for Complete Dentistry for 12 years. She is a Prosthodontist specializing in complex occlusal disorders, complete dentures, implants, and dermal fillers. She is a faculty member at The Dawson Academy in St. Petersburg. She holds awards from the International College of Dentists and the Academy of Oral Medicine. Dr. Daxon is also a member of the International College of Dentists, the Florida Academy of Dental Practice Administration, the American Dental Association, the Florida Dental Association, the American College of Prosthodontists, the Florida Prosthodontic Association, the West Coast Dental Association and the Pinellas County Dental Association. Dr. Daxon is an active member in her church and community. Her husband, Patrick, is Vice President of the Financial Planning Department at Raymond James. They enjoy spending time with their three girls, Claire, Grace, and Lilly. Her interests include cooking, gardening, water-skiing, exercising and fishing.