Information about Inlays And Onlays
In dentistry, an inlay is a filling consisting of a solid substance (as gold or porcelain) fitted to a cavity in a tooth and cemented into place.
Sometimes, a tooth is treatment planned to be restored with an intracoronal restoration, but the decay or fracture is so extensive that a direct restoration, such as amalgam or composite, would compromise the structural integrity of the restored tooth by possibly undermining the remaining tooth structure or providing substandard opposition to occlusal (i.e. biting) forces. In such situations, an indirect gold restoration may be indicated, such as the gold inlay shown below. When gold is used, the tooth-to-restoration margin may be finished and polished to such a super-fine line of contact that recurrent decay will be all but impossible. It is for this reason that some dentists recommend gold as the restorative material of choice for pretty much any and all restorations. While these restorations might be ten times the price of direct restorations, the superiority of gold as a restoration in terms of resistance to occlusal forces, protection against recurrent decay, precision of fabrication, marginal integrity and many other aspects of restorative quality offers an excellent alternative to the direct restoration. For this reason, some patients request gold restorations so they can benefit from its wide range of advantages even when an amalgam or composite will suffice. The only true disadvantage of gold is the higher cost, which is offset by the quality afforded to those who can afford it.
Inlays and onlays can also be made out of porcelain and some other forms of ceramic, and the use of CAD/CAM technology can also be implemented.
A prosthodontist is a dentist who specializes in prosthodontics, the specialty of implant, esthetic and reconstructive dentistry.
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Inlays
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An impression of a tooth prepared for restoration with a DO gold inlay on tooth #5. The "DO" designation indicates that the gold serves as a restoration for the distal and occlusal surfaces of the tooth. This tooth was prepared and the inlay will be fabricated according to the R.V. Tucker method of gold inlay preparation. Notice how the line angles of the impression for the inlay are very sharp and precise; this is achieved using carbon-tipped stainless steel instruments. The salmon-colored polyvinylsiloxane impressionmaterial is less viscous than the blue and is able to capture better detail for the tooth being restored.
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An MO gold inlay on tooth #3, the "MO" designation indicating that the gold serves as a restoration for the mesial and occlusal surfaces of the tooth. This tooth was also restored according to the R.V. Tucker method. Notice how the gold appears to flow into the tooth structure, almost perfectly mimicking the natural contours and even allowing the specular reflection to continue over the margin from tooth to gold.
Onlays
Additionally, when decay or fracture incorporate areas of a tooth that make amalgam or composite restorations essentially inadequate, such as cuspal fracture or remaining tooth structure that undermines perimeter walls of a tooth, a gold onlay might be indicated. Similar to an inlay, a gold onlay is an indirect restoration which incorporates a cusp or cusps by covering or onlaying the missing cusps. All of the benefits of a gold inlay are present in the onlay restoration. The onlay allows for conservation of tooth structure when the alternative is to totally eliminate cusps and perimeter walls for restoration with a crown. Because onlays have a very long margin (i.e. the line of tooth-to-restoration contact is much longer than that of a crown because of the many turns and curves that an onlay makes in contacting the tooth), some dentists feel that an onlay is a fundamentally inferior restoration. This is because it is primarily the marginal adaptation of any dental restoration that will decide whether or not it will successfully remain in the mouth without exhibiting recurrent decay. The increase in marginal length consequently provides a further likelihood of failure.Materials and fabrication
When inlays and onlays are made out of gold, they are fabricated using the lost-wax technique.Inlays and onlays can also be made out of porcelain and some other forms of ceramic, and the use of CAD/CAM technology can also be implemented.
References
The Gold Inlay Instructional DVD, The Academy of R.V. Tucker Study Clubs, distributed by Jensen Industries.Prosthodontology | |
|---|---|
| Fixed Prosthodontic Restorations | Bridge - Crown - Inlays and onlays - Post and core - Veneer |
| Removable Prosthodontic Restorations | Complete dentures - Flipper - Removable partial dentures |
| Prosthodontic considerations | Biologic width - Centric relation - Crown-to-root ratio - Maximum intercuspation - Mutually protected occlusion - Occlusion - Vertical dimension of occlusion |
| Other specialties | - - |
GOLD refers to one of the following:
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- GOLD (IEEE) is an IEEE program designed to garner more student members at the university level (Graduates of the Last Decade).
- GOLD (parser) is an open source BNF parser.
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Crown refers to the restoration of teeth using materials that are fabricated by indirect methods which are cemented into place. A crown is used to cap or completely cover a tooth.
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Crown refers to the restoration of teeth using materials that are fabricated by indirect methods which are cemented into place. A crown is used to cap or completely cover a tooth.
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amalgam is any mixture or blending of mercury with another metal or with an alloy. Most metals are soluble in mercury, but some (such as iron) are not. Amalgam also may be a solution of metal-like ion complexes, such as ammonium. Amalgams are commonly used in dental fillings.
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Composite may refer to:
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- Acting, Film, and Studio
- Composite card - a marketing tool for actors and especially models.
- Composite character - a character in an adaptation of a work formed from two or more characters from the original work.
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GOLD refers to one of the following:
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- GOLD (IEEE) is an IEEE program designed to garner more student members at the university level (Graduates of the Last Decade).
- GOLD (parser) is an open source BNF parser.
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amalgam is any mixture or blending of mercury with another metal or with an alloy. Most metals are soluble in mercury, but some (such as iron) are not. Amalgam also may be a solution of metal-like ion complexes, such as ammonium. Amalgams are commonly used in dental fillings.
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cusp is an occlusal or incisal eminance on a tooth.
Canine teeth, otherwise known as cuspids, each possess a single cusp, while premolars, otherwise known as bicuspids, possess two each. Molars normally possess either four or five cusps.
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Canine teeth, otherwise known as cuspids, each possess a single cusp, while premolars, otherwise known as bicuspids, possess two each. Molars normally possess either four or five cusps.
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Crown refers to the restoration of teeth using materials that are fabricated by indirect methods which are cemented into place. A crown is used to cap or completely cover a tooth.
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Lost-wax casting, sometimes called by the French name of cire perdue, is the process by which a bronze is cast from an artist's sculpture. An ancient practice, the process today varies from foundry to foundry, but the steps which are usually used in casting small bronze
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This article or section needs copy editing for grammar, style, cohesion, tone and/or spelling.
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This article has been tagged since January 2007.
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CAD/CAM Dentistry, (Computer-Aided Design and Computer-Aided Manufacturing in Dentistry), is an area of Dentistry utilizing CAD/CAM technologies to produce Fixed Dental Prosthetics, (Dental Crowns and Bridges).
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worldwide view.
Prosthodontics is one of the nine dental specialties recognized by the American Dental Association (ADA).A prosthodontist is a dentist who specializes in prosthodontics, the specialty of implant, esthetic and reconstructive dentistry.
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A dental bridge, otherwise known as a fixed partial denture, is a prosthesis used to replace missing teeth and is not removable by the patient. A prosthesis that is removable by the patient is called a removable partial denture.
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Crown refers to the restoration of teeth using materials that are fabricated by indirect methods which are cemented into place. A crown is used to cap or completely cover a tooth.
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A post and core is a dental restoration used to sufficiently build-up tooth structure for future restoration with a crown when there is not enough tooth structure to properly retain the crown, due to loss of tooth structure to either decay or fracture.
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In dentistry, a veneer is a thin layer of restorative material placed over a tooth surface, either to improve the aesthetics of a tooth, or to protect a damaged tooth surface. There are two types of material used in a veneer, composite and porcelain.
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Dentures are prosthetic devices constructed to replace missing teeth, and which are supported by surrounding soft and hard tissues of the oral cavity. Conventional dentures are removable, however there are many different denture designs, some which rely on bonding or clipping onto
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removable partial denture (RPD) is for a partially edentulous dental patient who desires to have replacement teeth for functional or esthetic reasons, and who cannot have a bridge (a fixed partial denture) for any number of reasons, such as a lack of required teeth to serve as
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Crown lengthening is a surgical procedure performed by a dentist to expose a greater height of tooth structure in order to properly restore the tooth prosthetically.[1]
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In dentistry, centric relation is the mandibular jaw position in which the head of the condyle is situated as far superior and anterior as it possibly can within the glenoid fossa.
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Crown-to-root-ratio is an important consideration in the diagnosis, treatment planning and restoration of teeth, one that hopefully guides the the plan of treatment to the proper end result.
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In dentistry, maximum intercuspation refers to the occlusal position of the mandible in which the cusps of the teeth of both arches fully interposition themselves with the cusps of the teeth of the opposing arch.
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In dentistry, a mutually protected occlusion is an occlusal scheme in which the anterior teeth protect the posterior teeth, and vice versa.
The anterior teeth protect the posterior teeth by providing for a plane of guidance during excursions, thus allowing the cusps of the
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The anterior teeth protect the posterior teeth by providing for a plane of guidance during excursions, thus allowing the cusps of the
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Occlusion, in a dental context, means simply the contact between teeth. More technically, it is the relationship between the maxillary (upper) and mandibular (lower) teeth when they approach each other, as occurs during chewing or at rest.
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The vertical dimension of occlusion, or VDO is a dental term used to indicate the measurement of the the superior-inferior relationship between the maxilla and the mandible when the teeth are situated in maximum intercuspation.
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