Non rigid connector: broken stress mechanical union of retainer (dovetail keyway) and pontics (T -shaped key). Markley (1951) suggested that non rigid connector should be placed at one of the terminal retainers. A NRC acts as a stress breaker so that the anterior and posterior segments can move independent of … Department of Prosthodontics and Crown and Bridge, Pushpagiri College of Dental Sciences, Tiruvalla, Kerala, India, Correspondence Address:Ansu KuruvilaDepartment of Prosthodontics and Crown and Bridge, Pushpagiri College of Dental Sciences, Pushpagiri Medicity Campus, Perumthuruthy, Tiruvalla - 689 107, Kerala IndiaSource of Support: None, Conflict of Interest: NoneCheckDOI: 10.4103/jioh.jioh_121_17 function RightsLinkPopUp () { var url = "https://s100.copyright.com/AppDispatchServlet"; var location = url + "?publisherName=" + encodeURI ('Medknow') + "&publication=" + encodeURI ('JIOH') + "&title=" + encodeURI ('The key to the management of pier abutment: An alternative approach') + "&publicationDate=" + encodeURI ('May 1 2017 12:00AM') + "&author=" + encodeURI ('Kuruvila A, Joseph S, Jayalekshmi NL, Menon SK') + "&contentID=" + encodeURI ('JIntOralHealth_2017_9_3_136_209053') + "&orderBeanReset=true" J Clin Diagn Res 2014;8:ZD12-3. It ... [Show full abstract] transfers shear stresses to supporting bone & permits abutments to move independently. The prosthesis was cemented with glass ionomer cement, Conventional tooth abutment preparations with less reduction, Simplified angulation and placement of the nonrigid connector with mesially inclined posterior abutment, Chances of key getting unseated from keyway on mesial movement of the abutment, Fabrication of nonrigid connector is technique sensitive and requires increased laboratory time and, Dovetail (key-keyway) or (tenon-mortise) connectors, Pier abutment, which acts as a fulcrum, causes failure of the weakest of the terminal abutments, Malaligned abutment, where parallel preparation might result in devitalization. A five unit fixed dental prosthesis with a pier abutment poses a unique challenge of a fulcrum and torquing forces at the intermediate abutment. A 3-dimensional cross-section FEM model (SAP 2000) simulating a 5-unit metal ceramic FPD with a pier abutment with rigid or nonrigid designs (connector location at the mesial region of the second molar, at the distal region of the second premolar, at the mesial region of the second premolar, and at the distal region of the canine) was developed. Tooth movements in divergent directions create stresses, that are transferred to the abutments & cause failure of the weaker retainer as the pier abutment act as a fulcrum. Shillingburg HT Jr., Fisher DW. If the posterior retainer and pontic are opposed by a removable partial denture or an edentulous ridge while the two anterior retainers are opposed by natural dentition. J Prosthet Dent 2005;94:10-92. a. Badwaik PV, Pakahan AJ. A non-rigid connector is a broken-stress mechanical union of retainer and pontic, instead of the usual rigid connector. Why is a non rigid connector on the middle abutment used with a pier abutment? 5 0 obj ��v��a�����f�7�2l�Yc4.N���S>KD�����’��V Botelho MG, Dyson JE. Shear stresses are concentrated on the supporting bone and not on the connector in a stress breaker; hence the need for a stress breaker in pier abutment on both ends of the nonrigid connector is recommended. Markley 5 described that the non-rigid connector should be placed at one of the terminal retainers while Gill suggested that non-rigid connector should be placed at one side or both sides of pier abutment. A 2-dimensional finite element model simulating a 5-unit metal ceramic fixed partial denture with a pier abutment with rigid or non-rigid designs, the connector was located at the distal region of the second premolar, was developed. Pier Abutments. An innovative and cost effective way of fabricating a non-rigid connector is presented in this case report. Shillingburg HT Jr., Hobo S, Whitsett LD, Jacobi R, Brackett SE. it isolates force to the segment of the FPD to which it is applied... i.e if it is applied distal the force won't be translated to … 5 Unit Bridge Terminal ... non-rigid mechanisms have been created to combat these potential problems - "stress Breakers" Diagram showing a Pier Abutment. Keywords: Pier abutment, Stress-breaker, Non-rigid connector Introduction Advertisers Access Statistics Resources. [6] Gill (1952) recommended placing non rigid connector at … Casting of the male pattern was contemplated, Now, matrix and patrix were assembled together, Porcelain fused to metal with buccal facing was done on #13–#16 and full metal restoration was done on #17. The nonrigid connector is a broken-stress mechanical union of retainer and pontic, instead of the usual rigid connector.The most commonly used nonrigid design consists of a T-shaped key that is attached to the pontic, and a dovetail keyway placed within a retainer.

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