This article is featured in the Australasian Dentist July 2007 Edition There are obvious aesthetic advantages of white fibre posts over metal posts as the ideal solution for restorations on both anterior and posterior teeth. Polydentia fibre posts are also considerably stronger than other leading GF posts. This is primarily due to their 80% glass fibre content with only 20% polyester resin compared to other brands at around 60% glass fibre. Further strength in the Polydentia post is achieved from the large number of 20 μm unidirectional, individual glass fibres embedded in a polyester resin matrix, which is a material also renowned for its low allergy factor. The longitudinal fibres reinforce the post's structure, supplying an enhanced flexibility and elasticity modulus of 42 GPa. (Stainless Steel is 210 GPa and Titanium 110 GPa) With the Polydentia post elasticity modulus being close to that of dentine at 33 GPa, a balanced distribution of forces is provided throughout the whole root structure. Although the Polydentia GF posts have a high mechanical strength, should endodontic re-treatment becomes necessary, they can easily be removed by drilling. Important features associated with the Polydentia GF Posts are- - Homogeneous distribution of forces
- No stress concentrations in dentine helping prevent root fractures
- Excellent and strong adhesion to core composite
- Easy and fast to remove
- Direct composite core build-up in a single session
- Can be autoclaved at 134°C
- Posts can be easily shortened to the required length
The length of the Polydentia GF Post is 20 mm. The posts and drills are available in four different diameters - 1.1mm, 1.3mm, 1.5mm and 1.7 mm - with the GF Posts Kit including 10 posts and 1 matching drills per size. For information on Polydentia GF Posts or any of the other innovative new products, please contact Ark Health on: 02 9477 4610 |
