Inlays and onlays - wikipedia Inlays and onlays `` Onlay '' redirects here. For the town in France, see Onlay, Nièvre. Inlays and onlays ICD - 9 - CM 23.3 MeSH D007284 ( edit on Wikidata ) Fabrication of inlay from IPs emax followed by cementation to tooth structure In dentistry, an inlay is usually an indirect restoration ( filling ) consisting of a solid substance ( as gold, porcelain or less often a cured composite resin ) fitted to a cavity in a tooth and cemented into place. This technique involves fabricating the restoration outside of the mouth using the dental impressions of the prepared tooth, rather than placing a soft filling into the prepared tooth before the material sets hard. An onlay is the same as an inlay, except that it incorporates a replacement for a tooth cusp by covering the area where the missing cusp would be. Crowns cover all surfaces of the anatomical tooth crown. Contents 1 Inlays 1.1 Comparison of inlays and direct fillings 2 Onlays 3 References Inlays An impression of preparation 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 impression material is less viscous than the blue and is able to capture better detail for the tooth being restored. Sometimes, a tooth is 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 or provide substandard opposition to occlusal ( i.e., biting ) forces. In such situations, an indirect gold or porcelain inlay restoration may be indicated. Comparison of inlays and direct fillings When an inlay is used, the tooth - to - restoration margin may be finished and polished to a very fine line of contact to minimize recurrent decay. Opposed to this, direct composite filling pastes shrink a few percent in volume during hardening. This can lead to shrinkage stress and rarely to marginal gaps and failure. Although improvements of the composite resins could be achieved in the last years, solid inlays do exclude this problem. Another advantage of inlays over direct fillings is that there is almost no limitations in the choice of material. While inlays might be ten times the price of direct restorations, it is often expected that inlays are superior in terms of resistance to occlusal forces, protection against recurrent decay, precision of fabrication, marginal integrity, proper contouring for gingival ( tissue ) health, and ease of cleansing offers. However, this might be only the case for gold. While short term studies come to inconsistent conclusions, a respectable number of long - term studies detect no significantly lower failure rates of ceramic or composite inlays compared to composite direct fillings. Another study detected an increased survival time of composite resin inlays but it was rated to not necessarily justify their bigger effort and price. 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 Onlays When decay or fracture incorporate areas of a tooth that make amalgam or composite restorations inadequate, such as cuspal fracture or remaining tooth structure that undermines perimeter walls of a tooth, an onlay might be indicated. Similar to an inlay, an onlay is an indirect restoration which incorporates a cusp or cusps by covering or onlaying the missing cusps. All of the benefits of an inlay are present in the onlay restoration. The onlay allows for conservation of tooth structure when the only alternative is to totally eliminate cusps and perimeter walls for restoration with a crown. Just as inlays, onlays are fabricated outside of the mouth and are typically made out of gold or porcelain. Gold restorations have been around for many years and have an excellent track record. In recent years, newer types of porcelains have been developed that seem to rival the longevity of gold. If the onlay or inlay is made in a dental laboratory, a temporary is fabricated while the restoration is custom - made for the patient. A return visit is then required to fit the final prosthesis. Inlays and onlays may also be fabricated out of porcelain and delivered the same day utilizing techniques and technologies relating to CAD / CAM dentistry. A systemic review found that the most common cause of onlay failure is ceramic fracture, followed by ceramic de-bonding from the tooth structure, and the occurrence of secondary caries which is seen as a discolouration at the margins of the restoration. High failure rates were associated with teeth that had previous root canal treatment, and with patients who exhibit para-functional habits such as bruxism, or teeth clenching. References Dentistry portal Wikimedia Commons has media related to Dental inlays. Jump up ^ NW Medical Guide Jump up ^ Schneider et al. : Shrinkage Stresses Generated during Resin - Composite Applications : A Review ; ( 2010 ) ; J Dent Biomech ; vol. 1 no. 1 131630 doi : 10.4061 / 2010 / 131630 Jump up ^ Clinical evaluation of ceramic inlays compared to composite restorations. ; ( 2009 ) ; RT Lange, P Pfeiffer ; Oper Dent. May - Jun ; 34 ( 3 ) : 263 - 72. doi : 10.2341 / 08 - 95 Jump up ^ Pallesen, U ; Qvist, V. `` Composite resin fillings and inlays. An 11 - year evaluation. ( 2003 ) ''. Clin Oral Invest. 7 : 71 -- 79. doi : 10.1007 / s00784 - 003 - 0201 - z. Jump up ^ Dijken, JWV Van ( 2000 ). `` Direct resin composite inlays / onlays : an 11 year follow - up ''. J Dent. 28 ( 5 ) : 299 -- 306. doi : 10.1016 / s0300 - 5712 ( 00 ) 00010 - 5. PMID 10785294. Jump up ^ `` Inlay - Onlay en composite ''. Le courrier du dentiste. November 2012. Retrieved February 2018. Check date values in : access - date = ( help ) Jump up ^ Masek R, Tsotsos S ( October 2002 ). `` Ultimate accuracy with correlation ''. Int J Comput Dent. 5 ( 4 ) : 295 -- 303. PMID 12736941. Jump up ^ Masek R ( January 2003 ). `` Designing in 3D -- a more visual approach to Cerec correlation ''. Int J Comput Dent. 6 ( 1 ) : 75 -- 82. PMID 12838591. Jump up ^ `` Longevity of ceramic onlays : A systematic review ''. BDJ. 224 ( 10 ) : 787 -- 787. 2018 - 05 - 25. doi : 10.1038 / sj. bdj. 2018.414. ISSN 0007 - 0610. Prosthodontology ( ICD - 9 - CM V3 23.2 -- 23.6, ICD - 10 - PCS 0C ? W -- X ) Procedures Dental restoration Bridge Resin - retained bridge Rochette bridge Crown Post and core Inlays and onlays Veneer Diagnostic wax - up Removable Dentures Complete dentures Removable partial dentures Fixed partial dentures Maxillofacial Ocular prosthesis Craniofacial prosthesis Physiology Biologic width Centric relation Crown - to - root ratio Maximum intercuspation Occlusion vertical dimension mutually protected Dahl concept Masticatory force Neutral zone See also Dental implant Cosmetic dentistry Dental laboratory Retrieved from `` https://en.wikipedia.org/w/index.php?title=Inlays_and_onlays&oldid=850926713 '' Categories : Restorative dentistry Hidden categories : CS1 errors : dates Talk Contents About Wikipedia Bân - lâm - gú Deutsch 한국어 Italiano Қазақша Nederlands 日本 語 Polski Русский Српски / srpski 中文 5 more Edit links This page was last edited on 18 July 2018, at 22 : 01 ( UTC ). 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Question: the metal of choice for inlay and onlay cast restorations is
Answer: gold