Posterior alveolar ridge resorption in bar-retained mandibular overdentures: 10-year results of a prospective clinical trial.

Abstract:

OBJECTIVES:Data on posterior alveolar ridge resorption (PARR) in patients with two implant supported mandibular overdentures is very heterogeneous. The aim of this prospective study was to observe the PARR after ten years for a study population treated with a titanium bar retained overdenture on two IMZ-implants. MATERIAL AND METHODS:The data pool consisted of digital and digitized conventional panoramic radiographs taken prior to implant placement and at follow up appointments. Digital measurements were carried out following an established procedure ("Tuebingen method" by Gomez-Roman). For each patient a linear regression was calculated resulting in a relative area related PARR-value per year. A simplified geometrical scenario was used for the estimation of absolute bone height losses. RESULTS:Data of 23 patients was available. The mean observation period was 9.4 years (±2.4 years). An average area related PARR-rate of 1.02% per year was observed with high individual differences ranging from 0.15% and 2.63% per year. The estimated average ten year vertical bone loss in the chewing center was 1.5 mm. CONCLUSIONS:Posterior bone resorption was found to be in the range previously reported for different implant restorations and therefore does not represent a particular problem of two implant bar retained overdentures. The results strengthen the two implant concept.

journal_name

Clin Oral Implants Res

authors

Raedel M,Lazarek-Scholz K,Marré B,Boening KW,Walter MH

doi

10.1111/clr.12393

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

1397-401

issue

12

eissn

0905-7161

issn

1600-0501

journal_volume

26

pub_type

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