Clinical evaluation of inter-implant distance influence on the wear characteristics of low-profile stud attachments used in mandibular implant retained overdentures

Abstract

BackgroundThis study was aimed to evaluate the influence of inter-implant distance on the wear characteristics of low-profile stud attachments used in mandibular implant retained overdentures.Material and MethodsForty Completely edentulous participants aged between 50 – 70 years were enrolled in this study. Each patient received 2-implants by 2-stage submerged surgical protocol. Participants categorized into 4-groups. Group I: 19 mm inter-implant distance with Locator retained overdentures; Group II: 19 mm inter-implant distance with OT Equator retained overdentures; Group III: 25 mm inter-implant distance with Locator retained overdentures; Group IV: 25 mm inter-implant distance with OT Equator retained overdentures. The female housings of each attachment were picked up to the mandibular overdenture. 12 month later the male inserts were replaced by new one. The used retentive male inserts were examined by Stereomicroscopic.ResultsStereomicroscopic examination revealed wear were detected on both inner surface and, the core of male inserts. Comparison between the unused and the used Locator and OT equator retentive male inserts at various inter-implant distance revealed highly significant wear changes between them at either 19 mm, or 25 mm inter-implant distance P1= .000, P2=.000 respectively.ConclusionsAfter one year of implant overdenture clinical use; both locator and OT equator retentive male inserts revealed significant surface deformities and wear. Wear were more notable on both locator and OT equator retentive male inserts with 25 mm interimplant distance than with 19 mm interimplant distance. Key words:Inter-implant distance, attachments wear, locator retentive male inserts, OT equator retentive male inserts.

Using Different Low-Profile Abutments for Assisting Mandibular Implant Overdenture: A Split-Mouth Study

“…Split mouth study design was carried out previously to study implant behavior by applying different system in each quadrant [ 25 ]. The combined assessment by Locator ® and Equator® was designed based on the low-profile nature of both systems [ 26 ]. While both attachments are comparable in height [ 27 ], the variation of stud attachment height is tolerable within a limited range [ 28 , 29 ].…”

“…With advance of time, and due to the resiliency of the Locator ® and OT Equator ® , minute food debris accumulates to the intaglio of MIOD [ 32 ]. This movement is exaggerated with OT Equator ® due to loss of precision fit of nylon insert by wearing [ 26 ]. Adding to that, the day and night wearing of the overdenture after substitution of postinsertion complains.…”

Effect of two different Overdenture attachments on the biting force and occlusal force distribution

“…The double retentive surface area is called "Dual retention" (internal and external features of the abutment) ensuring long-lasting retention life. (16,17) The T-Scan System is a dental device used to analyze the relative occlusal load that is recorded by a pressure mapping sensor intraorally. The system unit include computer software, recording sensor and handle assembly.…”