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New Choices in Full Arch Tooth ReplacementsThe Magic of Cantilever PhysicsA cantilever is a beam supported on only one end. Cantilevers are evident just about everywhere. The most common example is a hotel or apartment balcony.This concept has been used in dentistry for quite some time, where there is a missing tooth (usually at the end of a posterior arch with no adjacent tooth available for an anchor.
Traditional Implant Tooth Replacement CasesPictured here is the extreme case where a patient treats all tooth extractions with traditional dental implants. This massive number of implants provides the assurance that the critical value of healthy bone stimulation provided by root form implants literally stimulates the entire jaw.
Other patients focused on getting good bridge dentistry with fewer implants can scale down the number of implants to 4 or 6 (better) for a full arch. Cost and surgery are common factors for determining what is best for each patient. Bone Loss LimitationsPatients who have endured bone loss across the arch (upper or lower or both) are often limited in the number of implants that can be used. The loss of jawbone integrity could have been caused by gum disease, idiopathic resorption, excessive extractions, trauma or a long history of denture use.Four Implant ConfigurationTypically, there will be two anchor implants at the end of the arch. Older patients may elect to have a shorter arch or resorbed bone in those locations (normal for older patients) may dictate having a shorter arch.The other two implants are usually placed in the anterior sections of the bridge, equidistant when possible, for maximum support. When a total of six implants are used, they are placed in correspondingly similar positions, given that bone is healthy or can be rebuilt or augmented. Cantilever DesignsNobel Biocare has been a major influence in advancing tooth replacement technologies that give patients more options for replacing teeth where there is minimal or spotty bone conditions throughout an arch.The All On Four and Teeth In An Hour (both trademarked by Nobel Biocare) is a proprietary treatment paradigm that uses cone beam catscans and CAD/CAM equipment to design porcelain or acrylic bridge prosthetics that can take the best advantage (or create the advantage) of a patient's jawbone characterstics. Nobel's bridge designs have become a popular treatment choice for patients who can no longer wear dentures comfortably... or they no longer want dentures. Full Arch Cantilever Bridge Example
The use of special metallic alloys and basic principles of cantilever physics enable this custom bridge to deliver the biting, chewing and normalized bite properties of a full arch of teeth. The 2nd, restorative view of this custom tooth replacement show a full adult arch of twelve (12) teeth. The metal components of the implant screw retained mounts can be seen along the bottom edge.
This design provides the rock solid support for the hybrid metallic infrastructive that the porcelain (or acrylic) restoratives are built upon. The adjacent xray photo (Dr. Ara Nazarian, Troy MI) is a representation of how implants placed in the anterior region of the lower jaw (this jawbone area is the most dense compared to all other areas of the jaw).
The area of bone that contains the implants, as seen here, is the most dense bone throughout our jaws. For most patients it is the last area of bone to resorb under normal circumstances. A large number of patients can be candidates for a mandibular cantilever bridge, that sometimes may require bone augmentation when the height is insufficient. Zygoma Cantilever
Patients who demand the absolute best in cosmetics and long term dental function when bone quality is poor in the upper jaw commonly favor this treatment. Who Can Be a Candidate?Misch Implant Institute is just one of the Post Graduate training programs that provide unique training to dentists who continually seek new and improved ways of using existing technologies while remaining on the bleeding edge of things yet to come. These doctors are responsible for creating tooth replacement solutions that were impossible to achieve for many patients just a few years ago.Bone grafting products, autogenous tissue harvesting techniques, laser assisted periodontal therapies, advanced antibiotics, CAD/CAM science and the latest in 3D Imaging diagnostics enable a growing number of dentists to treat a number of conditions that historically had few options. Patients with severe gum disease that has caused radical losses of bone, periodontal tissues and teeth can often become candidates for cantilevered, full sets of new teeth. Long term denture wearers also can have more options for retreatment...even in situations where they have been told they "have no bone." Ridge splitting and chin block and ramus grafts have been beneficial for creating cantilevered implant systems in jaws that were once considered bereft of useable jawbone. Denture patients who no longer want teeth that are removed every day. Patients who have been wearing dentures not for a lifetime but perhaps a few years are frequently ideal candidates for getting new porcelain or acrylic teeth that are permanently fixed into the jaw. Editorial Staff 
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