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Marginal bone levels around maxillary implants supporting overdentures or fixed prostheses: a comparative study using
S Palmqvist1, K Sondell, B Swartz
1Prosthodontic Department, Postgraduate Dental Education Center, Orebro, Sweden.
Summary
Maxillary implants supporting overdentures showed no significant marginal bone loss compared to fixed prostheses. Advanced narrow-beam radiography confirmed similar bone levels around implants in both groups, challenging previous findings.
Area of Science:
- Dental Implantology
- Oral Surgery
- Radiology
Background:
- Assessing marginal bone levels around maxillary implants supporting overdentures is challenging with conventional radiography.
- Previous studies suggested potential continuous marginal bone loss around maxillary overdenture implants, but evidence is limited.
- Severely resorbed maxillae present unique difficulties for radiographic evaluation of implant osseointegration.
Purpose of the Study:
- To compare marginal bone levels around maxillary implants supporting overdentures versus fixed prostheses.
- To evaluate the efficacy of narrow-beam radiography in assessing bone levels in resorbed maxillae.
- To investigate potential differences in bone height between implant-supported overdenture and fixed prosthesis groups.
Main Methods:
- Utilized detailed narrow-beam radiography for precise visualization of implants and surrounding bone.
- Compared marginal bone height around implants in patients with overdentures to a matched control group with fixed prostheses.
- Included patients with severely resorbed maxillae to assess radiographic technique in challenging cases.
Main Results:
- No statistically significant difference in marginal bone height was observed between the overdenture and fixed prosthesis groups.
- Narrow-beam radiography provided excellent depiction of implants and bone in severely resorbed maxillae.
- The findings contrast with earlier reports indicating continuous marginal bone loss in maxillary overdenture implants.
Conclusions:
- Maxillary implants supporting overdentures do not exhibit significantly different marginal bone levels compared to those supporting fixed prostheses.
- Narrow-beam radiography is a valuable tool for accurate assessment of marginal bone around implants in challenging anatomical situations.
- This study provides new evidence suggesting comparable bone stability for different types of maxillary implant-supported prostheses.