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![This dental radiograph displays two identical 5.0 mm diameter Biomet 3i tapered dental implants placed into the lower right mandible. Implants are indicated by yellow brackets while abutments are indicated by orange brackets. The healing abutment on the more posterior implant [left] is platform matched (it shares the same 5.0 mm diameter as the implant platform), while the healing abutment on the more anterior implant [right] is platform switched (it possesses a 4.1 mm diameter). Because the implant to the right is platform switched, its IAJ is more distinct. Implant-Abutment Junction.jpg](http://upload.wikimedia.org/wikipedia/en/thumb/a/aa/Implant-Abutment_Junction.jpg/350px-Implant-Abutment_Junction.jpg)
In implant dentistry, the implant-abutment junction (IAJ) refers to the location of intimate contact between a dental implant and its restorative abutment.
The IAJ is a focus of much attention because its morphology and location tend to affect the amount of bone resorption during the initial period of crestal bone changes immediately following implant placement. [1]
Bone conduction is the conduction of sound to the inner ear primarily through the bones of the skull, allowing the hearer to perceive audio content without blocking the ear canal. Bone conduction transmission occurs constantly as sound waves vibrate bone, specifically the bones in the skull, although it is hard for the average individual to distinguish sound being conveyed through the bone as opposed to the sound being conveyed through the air via the ear canal. Intentional transmission of sound through bone can be used with individuals with normal hearing — as with bone-conduction headphones — or as a treatment option for certain types of hearing impairment. Bone generally conveys lower-frequency sounds better than higher frequency sounds.
A bridge is a fixed dental restoration used to replace one or more missing teeth by joining an artificial tooth definitively to adjacent teeth or dental implants.
A dental implant is a prosthesis that interfaces with the bone of the jaw or skull to support a dental prosthesis such as a crown, bridge, denture, or facial prosthesis or to act as an orthodontic anchor. The basis for modern dental implants is a biological process called osseointegration, in which materials such as titanium or zirconia form an intimate bond to the bone. The implant fixture is first placed so that it is likely to osseointegrate, then a dental prosthetic is added. A variable amount of healing time is required for osseointegration before either the dental prosthetic is attached to the implant or an abutment is placed which will hold a dental prosthetic/crown.
Osseointegration is the direct structural and functional connection between living bone and the surface of a load-bearing artificial implant. A more recent definition defines osseointegration as "functional ankylosis ", where new bone is laid down directly on the implant surface and the implant exhibits mechanical stability. Osseointegration has enhanced the science of medical bone and joint replacement techniques as well as dental implants and improving prosthetics for amputees.
Unilateral hearing loss (UHL) is a type of hearing impairment where there is normal hearing in one ear and impaired hearing in the other ear.
A bone-anchored hearing aid (BAHA) is a type of hearing aid based on bone conduction. It is primarily suited for people who have conductive hearing losses, unilateral hearing loss, single-sided deafness and people with mixed hearing losses who cannot otherwise wear 'in the ear' or 'behind the ear' hearing aids. They are more expensive than conventional hearing aids, and their placement involves invasive surgery which carries a risk of complications, although when complications do occur, they are usually minor.
Toothlessness, or edentulism, is the condition of having no teeth. In organisms that naturally have teeth, it is the result of tooth loss.
Maxillary sinus floor augmentation is a surgical procedure which aims to increase the amount of bone in the posterior maxilla, in the area of the premolar and molar teeth, by lifting the lower Schneiderian membrane and placing a bone graft.
Nobel Biocare is a Swiss company originally founded in Sweden for manufacturing dental implants. It is now headquartered in Kloten, Switzerland near the Zürich Airport. Nobel Biocare in its current form was founded in 2002. It originates from a partnership formed in 1978 between Swedish medical researcher Professor Per-Ingvar Brånemark and Bofors, a Swedish company, to industrialize Brånemark's discovery of osseointegration. Beside dental implants, it also presently develops and commercializes CAD/CAM-based prosthetics equiments to scan teeth and to fabricate individualized dental prosthesis using digital technologies in place of silicone molding.
In dentistry, Ante's law is a postulate about crown-to-root ratio put forth by Irwin H. Ante in a thesis paper he wrote in 1926.
Computer-assisted surgery (CAS) represents a surgical concept and set of methods, that use computer technology for surgical planning, and for guiding or performing surgical interventions. CAS is also known as computer-aided surgery, computer-assisted intervention, image-guided surgery, digital surgery and surgical navigation, but these are terms that are more or less synonymous with CAS. CAS has been a leading factor in the development of robotic surgery.
In dentistry, an abutment is a connecting element. This is used in the context of a fixed bridge, partial removable dentures and in implants. The implant fixture is the screw-like component that is osseointegrated.
Peri-implantitis is a destructive inflammatory process affecting the soft and hard tissues surrounding dental implants. The soft tissues become inflamed whereas the alveolar bone, which surrounds the implant for the purposes of retention, is lost over time.
In dentistry, platform switching is a method used to preserve alveolar bone levels around dental implants. The concept refers to placing screwed or friction fit restorative abutments of narrower diameter on implants of wider diameter, rather than placing abutments of similar diameters, referred to as platform matching.
Peri-implant mucositis is defined as an inflammatory lesion of the peri-implant mucosa in the absence of continuing marginal bone loss.
A dental torque wrench or restorative torque wrench is a torque wrench used to precisely apply a specific torque to a fastener bolt for fixation of an abutment, dentures or prosthetics on a dental implant.
Bicon Dental Implants is a privately owned company located in Boston, MA. The company specializes in short dental implants that use a locking taper or cold welding connection to secure the abutment to the implant. Bicon is notable and worthy of mention for the following three reasons: First, Bicon implants are extremely short in length. The size of Bicon implants allow them to be placed in regions that are crowded with natural teeth and/or implants, or in regions that would otherwise require bone grafting. Second, the implants do not have the screw-form design typical of other available implants. Third, the abutments are connected to the implant via a locking taper. This is notable from both a medical and engineering standpoint as no other implant company offers an implant with a biological seal at the implant/abutment interface; almost all other implants possess an internal screw to connect their abutments.
Overdenture is any removable dental prosthesis that covers and rests on one or more remaining natural teeth, the roots of natural teeth, and/or dental implants. It is one of the most practical measures used in preventive dentistry. Overdentures can be either tooth supported or implant supported. It is found to help in the preservation of alveolar bone and delay the process of complete edentulism.
IAJ may refer to:
The history of dental treatments dates back to thousands of years. The scope of this article is limited to the pre-1981 history.