According to a recent news release, a new invention made at the Faculty of Dentistry, University of Oslo, Norway, helps the body generate new bone, which is as strong as the original. Using this new method, dentists can insert artificial scaffolding that will determine where the new bone tissue will grow.
If there is too wide a gap between two bone fragments, or if parts of the bone have been damaged, the body does not always succeed in repairing the damage by itself, as can happen when some of the bone has been removed during cancer surgery or when the bone has been damaged by radiotherapy.
âThis is where our invention comes in,â says StÃ¥le Petter Lyngstadaas, Research Dean at the Institute of Biomaterials, Faculty of Dentistry. Along with Professor Jan Eirik Ellingsen, Associate Professor HÃ¥vard Jostein Haugen and others, Lyngstadaas has developed and patented an artificial scaffolding that help the body to repair such âcriticalâ damage.
âWith our new method, itâs sufficient to insert a small piece of synthetic, bone stimulating material into the bone. The artificial scaffolding is as strong as real bone and yet porous enough for bone tissue and blood vessels to grow into it and work as a reinforcement for the new boneâ
If the defect is major, the bone cells will take a long time to grow into the scaffolding.
âTo speed things up, we can take bone progenitor cells or bone marrow that contain committed stem cells from the patients and insert them into the scaffolding. This will cause the process to accelerate.â
âWhen bone needs to be built into defects where the distance between the bone fragments exceeds one centimeter or so, stem cells should be added to obtain a good result, but stem cells are normally not required to solve problems with loose teeth and periodontitis,â Haugen underscores.
The bone cells are dependent on nutrients and good growth conditions and a specific signal to differentiate into bone forming cells.
âOne must therefore ensure that the surrounding bone tissue is healthy, and that there is ample blood supply to the site of surgery.â
According to the authors, manufacturing the material is a simple matter. A mixture of water and ceramic powder is poured through ultrapure foam rubber designed to look like trabecular bone. The ceramic powder consists of medical grade titanium dioxide monodisperse nano-particles. Titanium dioxide has already gone through numerous toxicity tests and is a very common additive to pharmaceuticals. The substance is also referred to as Eâ171 and is widely used for color in sweets, toothpaste, biscuits, baked goods, ice cream and cheese. When the mixture has solidified, it is heated to a temperature that causes the foam rubber to dissolve into water vapour and carbon dioxide and the nano-particles to ligate into one solid structure. The result is a mirror image of the foam rubber structure.
As the release states, the Norwegian dentists have tested the new method successfully on rabbits, pigs and dogs. In 2014, they wish to undertake clinical studies on patients with periodontitis and damage to the mandibular bone. To establish what method works best, it is advantageous to perform tests on patients with periodontitis in particular.