Old bridges

    The history of dental materials and techniques, many methods have tried to replace the lost teeth, more or less success. Today, modern techniques and materials are available, but old crowns, bridges are often found in patients mouth, therefore, we provide an overview of these as well.

    The first functional prosthetic functional crown was made of metal. In practice, a pre-formatted metal crown was adapted by the dental technician hammering to the plaster cast. Spliceing bridges are also made by this technique. Later, the whole metal bridgesmetal casting crowns have been produced by investment-cast, which greatly increased the accuracy.

    The next step of dental technicians development was the covering the visible surface of this metal bridges by hard plasticl (metal bridge with acrilic resin veneer). The disadvantages of this solution are the bad aesthetics, the acrilic resin veneer prone to wear and discoloration, so this technology is not suitable to cover the occlusal surface .

Old metal bridge with acrilic resin veneer and its failure: a: the veneer is detached from the cervical part, the metal is exposed b: a gap is formed between the veneer and the metal framework on the cervical part , which leads to discoloration c: the acrilic resin veneer is prone to growing plaque and discoloration	Old metal bridge with acrilic resin veneer and its failure: a: the veneer is detached from the cervical part, the metal is exposed d: due to the regular horizontal toothbrushing striations has developed in the acrilic resin veneer
Old metal bridge with acrilic resin veneer and its failure: c: the acrilic resin veneer is prone to growing plaque and discoloration	Old metal bridge with acrilic resin veneer and its failure: c: the acrilic resin veneer is prone to growing plaque and discoloration e: the acrilic resin veneer wear at the edges, exposed metal framework

    The porcelain fused to metal fixed dental prosthesis has been eliminate much failure of the metal bridge with acrilic resin veneer.