Glass-fibre rods as dental post in dentistry

When a tooth or molar is damaged or excessively filled, it is usually replaced by a crown. This special metal or porcelain capping is fitted over the damaged tooth or molar. In some cases, the old tooth or molar no longer provides sufficient grip to place a filling or crown. After a root canal treatment, a dental post is then inserted in the root canal that serves as a grip for the filling or crown. Traditionally, metal posts were used, but recent innovative developments also make the use of transparent glass-fibre profiles or carbon-reinforced profiles possible.

The glass-fibre or carbon posts are very strong and have a high elongation at break. Both glass fibre and the carbon do not corrode, are bio-compatible and have a very good resistance against bending forces and torques. The elasticity of both products is comparable to that of the dentine. Moreover, these implants absorb the occlusion tension instead of transferring it further, like metal posts do. The advantage of glass-fibre reinforced plastic compared to carbon-reinforced plastic is that glass-fibre can be made transparent, so that it does not shine through the dentine. Also, the transparency allows the post to be glued in the dental root by means of UV hardening dental cements (the UV light is transferred to the cement surface through the post).

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