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Digital Dentistry Impacts Hollywood – Newton, Wellesley, MA

Digital models of humans can be uncannily accurate these days, but there's at least one area where they fall short: teeth. Unless you're willing to scan the inside of someone's mouth, you aren't going to get a very faithful representation of someone's pearly whites.ryneDr. Ryne Johnson, a prosthodontist and managing partner of Newton Wellesley Dental Partners has been considered a pioneer in the use of CAD/CAM technology in dental restorations. He notes that, “Disney Research and ETH Zurich have just developed a technique to digitally recreate teeth beyond the gum line using little more than source data and everyday imagery. The team used 86 3D scans to create a model for an "average" set of teeth, and wrote an algorithm that adapts that model based on what it sees in the contours of teeth in photos and videos.  Unlike the $40,000 CAD/CAM unit that’s used in my office, this new approach allows sufficient accuracy to be captured from regular digital photographs”.

The technology doesn't require any special capture equipment outside of the initial scans (the camera on your phone will do). Also, you don't have to purposefully bare your teeth: it can work with the incomplete information from a smile or grimace. A movie crew could generate models based on a brief, natural motion capture session.project1

This being Disney, the most obvious use is for digital actor models in animated movies and video games. You could see uncannily realistic characters whose details pass muster even in close-up shots. However, there are plenty of medical uses as well. The scientists see dentists using the tech to previsualize a patient's mouth before they sit in the operating chair, and it's easy to imagine this leading to more authentic-looking dentures. As silly as the notion of accurately rendered teeth may be, they could be important for your well-being.

Dr. Johnson feels that this new technology will help the film and media production companies but will not be incorporated into a dental office any time soon.  However, he reminds everyone that, “digital dentistry is here and should be a part of your dental reconstructive and implant work”.

For more blogs by Dr. Johnson, click here To contact Dr. Johnson or the office, click here

Original article:  www.engadget.com Artwork:  Chenglei Wu, Derek Bradley et. al.

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Ceramic Dental Implants – Newton, Wellesely, MA

Are dental implants made from ceramics ready to consider as a viable alternative to metal?

Since their introduction over 40 years ago, dental implants have become an established treatment modality that had revolutionized the concept of replacing missing teeth. Dr. Ryne Johnson, prosthodontist ryneand managing partner of Newton Wellesley Dental Partners has been considered a pioneer in computer-assisted implant dentistry.  His first implant case was in 1988.  According to Dr. Johnson, “The recent material of choice for manufacturing dental implants is commercially pure titanium, because of its excellent biocompatibilty and mechanical properties However, the gray colour of the titanium may be disadvantageous and give rise to esthetic problems, especially if the soft tissue situation is not optimal and the dark colour shines through the thin peri-implant mucosa.  The profession has been looking for options to address this concern.  Some implant companies are wrapping a pink material along the collar of the implant while others are developing ceramic implants.”

project1Zirconia ceramics (yttrium-stabilized tetragonal poly-crystals) seem to be a suitable material for dental implants because of their tooth-like colour, their excellent mechanical properties and their good biocompatibility. They have extensively been used as ball heads in total hip replacements with remarkable clinical outcomes. Recent animal studies have also shown successful bone healing of dental zirconia implants under both unloaded and loaded conditions.  Dr. Johnson has been using zirconia to fabricate his dental crowns for many years without outstanding success. As the conventional fabrication of zirconia rods usually results in realtively smooth surfaces, only few studies have investigated rough surface modifications of zirconia implants. This is a critical aspect, since it has been already demonstrated that surface roughness and topography also influence osseointegration of zirconia implants.

A recent study by Rita Depprich, et al, in Head and Face Medicine, looks at the comparison of titanium and zirconia implants on pigs and concludes that, “zirconia implants with modified surfaces display features of osseointegration similar to those of titanium implants. These results are promising for using zirconia implants for dental applications in the future”.

“It’s still early in the game” according to Dr. Johnson, “but it may be available in the next few years after clinical trials are complete.  Until then, titanium implants are sill the gold standard. ”

For more information on Dr. Johnson, click here To contact Dr. Johnson or the office, click here

Original article:  https://head-face-med.biomedcentral.com Artwork: www.southerdentalimplant.com

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E-Cigarettes as bad the Real Ones? – Newton, Wellesely, MA

Former and would-be smokers who opt for electronic cigarettes may not be doing their teeth a whole lot of good, according to a new study.  Dr. Ryne Johnson, ryneprosthodontist and managing partner of Newton Wellesley Dental Partners has been educating his patients on the harmful effects of smoking on dental tissues for 30 years.  "Many have shifted toward the e-cigarettes thinking that they are a ‘safe’ alternative but new evidence suggests that both may increase the likelihood of gum disease".

However, research published in the journal Oncotarget, which focuses on cancer-related issues, suggests that electronic cigarette smoke may wreak the same type of havoc on teeth and gums that conventional tobacco does. A team of scientists from the University of Rochester and Stony Brook University found that the vapors released in e-cigarettes can cause tissue inflammation and damage comparable to that produces by regular ones.

Furthermore, chemicals used to flavor some e-cigs may cause even more harm to mouth tissue, the researchers say.  project1

Some caveats: This particular experiment was conducted on gum tissue, not live human participants. It’s possible that there are other confounding factors that may contribute to gum disease and in e-cig and regular cigarette users alike.

But it’s the latest example of scientific skepticism surrounding the health benefits of e-cigarettes. Manufacturers claim that they are an obviously superior alternative to conventional products that contain known carcinogens; but the overall public health ramifications of the products remain unclear, including whether or not they may actually be encouraging more kids to smoke.

For additional blogs by Dr. Johnson, click here To contact the office or reach Dr. Johnson, click here

Original article:  http://fortune.com/2016/11/17/e-cigarettes-yellow-teeth-study/ Artwork: www.motherjones.com

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All-on-Four Dental Implants – Newton, Wellesley, MA

Dr. Ryne Johnson, prosthodontist and managing partner of Newton Wellesley Dental Partners rynerecently participated in the American College of Prosthodontics annual meeting in San Diego where he discussed the All-on-4® treatment concept. It provides edentulous and soon-to-be edentulous patients with an efficient and effective restoration using four dental implants to support an immediately-delivered full-arch prosthesis.  Dr. Johnson has been called a pioneer in the synergistic use of computers in implant dentistry. His first case, using a CT scan generated model was performed in 1988.

After the first dental implant patient was treated in the 1980s, a discussion began around the optimal number of implants needed to anchor a fixed dental prosthesis in edentulous patients. Some clinicians tended to install as many implants as possible, often one per tooth. Others argued that biomechanically, only four or even three were needed. Only long-term clinical data could provide answers.

At the forefront

The records of the early patients of P-I Brånemark allowed for an early retrospective study. After a 10-year observation period, the survival rates were demonstrated to be the same for restorations with four and six implants assuming that the bone levels and distribution of implants were ideal. The challenge of advanced resorption remained, however. Because it is not possible in many cases to insert distal implants without grafting and/or nerve lateralization, thproject1e concept of tilting the two distal implants was introduced.

Immediate results

In 2003, the concept of immediate loading (placing a dental prosthesis on implants the same day the implants are placed) of four implants in edentulous lower—and soon after also upper—jaws with two tilted distal implants. This one-stage procedure substantially reduced the costly and time-consuming bone grafting procedures, number of surgeries and healing time.

The success continues

In an early reported a cumulative survival rate of 96.7% for implants and 100% for prostheses at up to 3-year follow up.2 Since then, he and others have repeatedly reproduced high survival rates for both upper and lower jaws.  Today, the All-on-4® treatment concept is used around the world with similar high survival rates and patient satisfaction that is enhanced by limited costs.

Dr. Johnson, with his in-office periodontist, has done hundreds of implant cases with outstanding results.  To arrange a consultation with Dr. Johnson, contact Newton Wellesley Dental Partners.

For additional blogs related to dentistry, click here To contact Dr. Johnson or the office, click here Original article and artwork: www.nobelbiocare.com

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