We are using cookies to implement functions like login, shopping cart or language selection for this website. Furthermore we use Google Analytics to create anonymized statistical reports of the usage which creates Cookies too. You will find more information in our privacy policy.
OK, I agree I do not want Google Analytics-Cookies
Quintessence International



Forgotten password?


Quintessence Int 40 (2009), No. 5     7. Apr. 2009
Quintessence Int 40 (2009), No. 5  (07.04.2009)

Page 405-412, PubMed:19582245

Analysis of retention and wear of ball attachments
Wolf, Katja / Ludwig, Klaus / Hartfil, Heike / Kern, Matthias
Objective: To evaluate the retention and the wear of different prefabricated precision ball attachments consecutively during long-term use.
Method and Materials: Six commercially available ball attachment systems were selected. The balls were attached to stylized implants fixed in metal casts. The matrices were fixed in a stylized unilaterally removable partial denture (RPD). Using a chewing simulator with 8 units, 50,000 joining and separating cycles of the matrices were performed. After each joining movement, an eccentric load of 100 N was applied to the RPD at a distance of 12 mm from the ball attachment. The retention forces were measured at intervals.
Results: Initially, median retentive forces varied between 8.2 N and 14.0 N. During the test, patterns in retention changes were identified. At the end of the test, one group with a matrix using precious alloy lamellae and a titanium ball showed significantly higher median retention forces (10.4 N) than the other ball attachments (1.0 N to 3.7 N). Also, the wear of the ball attachments varied considerably.
Conclusion: Within the limitations of this study, the material combination of a precious gold alloy matrix and a titanium ball seems to be favorable for long-term retention.

Keywords: ball attachment, implant, retention, wear