Stud attachments for the mandibular implant-retained overdentures: Prosthetic complications. A literature review

Abstract

A plethora of attachment systems for mandibular two-implant overdentures is currently available often without evidence-based support. Technical aspects are now parameters considered when choosing the appropriate attachment. Despite the increasing use of the Locator attachments, studies regarding their properties remain scarce. Peer reviewed articles published in English up to 2011, were identified through a MEDLINE search (Pubmed and Elsevier) and a hand search of relevant textbooks and annual publications. Emphasis was made on the technical complications as well as the loss of retention related to the attachments in implant-retained overdentures, primarily the Locator attachment. The evaluation of the long-term outcome of implant overdentures and complications associated with different attachment systems may provide useful guidelines for the clinician in selecting the type of attachment system and overdenture design.

Evaluation of Retention Forces and Resistance to Fatigue of Attachment Systems for Overdentures

“…20 The comparison between studies, however, is difficult because of different study methods and changes made by manufacturers. 9,25,26 Factors such as saliva composition, intraoral temperature, parafunctional habits, and implant angles may affect results. 12 Therefore, further studies should be conducted to contribute to the understanding of the behavior of these components.…”

“…This system can keep the prosthesis in place because of the friction between their components. 9 Depending on the characteristics of each system, different levels of overdenture retention may be achieved, which is translated to the patient as a more difficult displacement of the prosthesis and, consequently, greater comfort during mastication and speech. 10 The components may gradually lose their retention ability along time and should, therefore, be replaced to restore retention.…”

Comparación del nivel de la cresta ósea en desdentados totales rehabilitados con implantes mandibulares y prótesis removible

“…En relación a ello podemos inferir que la magnitud y calidad de las fuerzas masticatorias en nuestra investigación no constituyen un factor de sobre esfuerzo funcional, considerando que la arcada antagonista es una prótesis total removible convencional. Otro factor que contribuye a los resultados obtenidos es que el soporte de la prótesis parcial es mucoso, por lo tanto los máximos esfuerzos mecánicos que operan sobre el diente pilar se suscitan durante la inserción y remoción del dispositivo protésico y no como ocurre en las sobredentaduras cuyo soporte es implanto-mucoso, condición que explicaría los fenómenos de báscula que de acuerdo a la literatura se describen con estos últimos dispositivos (10,11) . Al examen visual de las piezas pilares no se observó cuadros inflamatorios en el entorno gingival, al parecer el acrílico, como material Tabla 1.…”

Overdenture in terms of preparation and restoration of supporting teeth: Review report

“…Teeth loss sometimes disturbs emotional tranquility exposing often depression. In those cases full D is unacceptable as a foreign body and loss of identity that is one more reason to prefer OD solution respecting remained teeth-abutments [7][8][9][10][11][12][13] .…”