Comparative study of four retentive anchor systems for implant supported overdentures--retention force changes.

Abstract:

OBJECTIVES:Wear of attachments leads to a loss of retention and potentially reduces the function of complete dentures. This study evaluated the retention force changes of different prefabricated attachment systems for implant-supported overdentures to estimate the wear constancy and applicability in clinical practice. METHODS:Four prefabricated attachment systems were tested [Group SG: retentive ball attachment (Straumann, Switzerland) with gold matrix, Group ST: retentive ball attachment (Straumann, Switzerland) with titanium spring matrix, Group IB: UNOR i-Ball with Ecco matrix (UNOR, Switzerland) and Group IMZ: IMZ-TwinPlus ball attachment with gold matrix (DENTSPLY Friadent, Germany)]. Ten samples of each system were subjected to 10,000 insertion-separation cycles. RESULTS:Results showed that all types of attachments showed wear, which led to a loss of retention force after an initial increase at the beginning of the wear simulation. Attachments with a plastic retention insert or gold matrices underwent the smallest changes in retention force. The titanium spring system showed the largest changes in retention force and a greater variation between the different cycles and specimen. This behaviour is probably caused by a large fitting tolerance of the titanium spring. CONCLUSIONS:Attachment systems which possess a male and female component of different material composition are preferable. They show smaller changes in the retention force. For retention force increase and wear compensation, an attachment system should be adjustable.

journal_name

Gerodontology

journal_title

Gerodontology

authors

Bayer S,Steinheuser D,Grüner M,Keilig L,Enkling N,Stark H,Mues S

doi

10.1111/j.1741-2358.2009.00286.x

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

268-72

issue

4

eissn

0734-0664

issn

1741-2358

pii

GER286

journal_volume

26

pub_type

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