Jong, M.H.M. de (Marjolein) (2009) Posterior mandibular residual ridge resorption and peri-implant marginal bone loss in patients with overdentures supported by two orfour endosseous implants in a 10 year prospective comparative study. thesis, Dentistry.
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Abstract
Abstract Purpose: The aim of this study was to evaluate the effect of treatment with either two or four mandibular endosseous implants with an overdenture on the mandibular posterior residual ridge resorption and peri-implant marginal bone loss over 10 years. Materials and methods: Sixty edentulous patients with mandibular height of between 12 and 18 mm participated. Thirty patients were treated with an overdenture supported by two IMZ implants (group A) and thirty patients were treated with an overdenture with four IMZ implants (group B). Orthopantomograms were taken before and 10 years after treatment. Proportional area measurements were used to determine changes in the mandibular posterior residual ridge bilaterally. Intra-oral radiographs were taken to measure marginal bone changes around the implants. Results: There was a statistically significant difference in mandibular posterior residual ridge resorption between the two types of treatment. The posterior bone area index was reduced by a mean of 10 % for group A and 6% for group B over 10 years. The average marginal bone loss was 1.4 mm in group A and 1. 0 mm in group B over 10 years. Conclusions: It can be concluded that there is a significant difference in mandibular posterior residual ridge resorption between patients treated with either two or four implants stabilising an overdenture. There is no statistically significant difference in periimplant bone loss in patients treated with two or four implants. No correlation was shown between mandibular posterior residual ridge resorption and peri-implant bone loss. The confounding factors of; marginal bone loss around the implants, age, gender, initial mandibular height and the number of years the patient had been edentulous failed to show a significant effect on the posterior ridge resorption.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Meijer, prof. H.J.A. and Universitair Medisch Centrum Groningen |
| Supervisor name: | Wright, prof. P.S. and Queen Mary University of London, Barts and The London School and Medicine and Dentistry |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:38 |
| Last Modified: | 25 Jun 2020 10:38 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/14 |
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