Within-subject comparison of two rigid bar designs connecting two interforaminal implants: patients' satisfaction and prosthetic results

Mericske-Stern, Regina; Probst, Dieter; Fahrländer, Fritz-Marc; Schellenberg, Marc (2009). Within-subject comparison of two rigid bar designs connecting two interforaminal implants: patients' satisfaction and prosthetic results. Clinical implant dentistry and related research, 11(3), pp. 228-237. Oxford: Blackwell 10.1111/j.1708-8208.2008.00109.x

[img] Text
26775.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (302kB) | Request a copy

BACKGROUND: There is evidence for the superiority of two-implant overdentures over complete dentures in the mandible. Various anchorage devices were used to provide stability to overdentures. The aim of the present study was to compare two designs of a rigid bar connecting two mandibular implants. MATERIALS AND METHODS: Completely edentulous patients received a new denture in the maxilla and an implant-supported overdenture in the mandible. They were randomly allocated to two groups (A or B) with regard to the bar design. A standard U-shaped bar (Dolder bar) was used connecting the two implants in a straight line. For comparison, precision attachments were soldered distal to the bar copings. Group A started the study with the standard bar (S-bar), while group B started with the attachment-bar (A-bar). After 3 months, they had to answer a questionnaire (visual analogue scale [VAS]); then the bar design was changed in both groups. After a period of another 3 months, the patients had to answer the same questions; then they had the choice to keep their preferred bar. Now the study period was extended to another year of observation, and the patients answered again the same questionnaire. In vivo force measurements were carried out with both bar types at the end of the test periods. The prosthetic maintenance service carried out during the 6-month period was recorded for both bar types in both groups. Statistical analysis as performed with the SPSS statistical package (SPSS Inc., Chicago, IL, USA). RESULTS: Satisfaction was high in both groups. Group B, who had entered the study with the attachment bar, gave slightly better ratings to this type for four items, while in group A, no differences were found. At the end of the 6-month comparison period, all but one patient wished to continue to wear the attachment bar. Prosthetic service was equal in groups A and B, but the total number of interventions is significantly higher in the attachment bar. Force patterns of maximum biting were similar in both bar designs, but exhibited significantly higher axial forces in the attachment bar. CONCLUSIONS: Both bar designs provide good retention and functional comfort. High stability appears to be an important factor for the patients' satisfaction and oral comfort. Rigid retention results in a higher force impact and appears to evoke the need for the retightening of occlusal screws, resulting in more maintenance service.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Prosthodontics [discontinued]

UniBE Contributor:

Mericske, Regina; Probst, Dieter and Fahrländer, Fritz-Marc

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1523-0899

Publisher:

Blackwell

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

04 Oct 2013 15:02

Last Modified:

25 Jan 2017 12:16

Publisher DOI:

10.1111/j.1708-8208.2008.00109.x

PubMed ID:

18783424

Web of Science ID:

000268924400008

BORIS DOI:

10.7892/boris.26775

URI:

https://boris.unibe.ch/id/eprint/26775 (FactScience: 87984)

Actions (login required)

Edit item Edit item
Provide Feedback