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Marginal bone loss with mandibular two-implant overdentures using different loading protocols and attachment systems:
Sunyoung Ma1, Andrew Tawse-Smith, W Murray Thomson
1Oral Implantology Research Group, Sir John Walsh Research Institute, School of Dentistry, University of Otago, Dunedin, New Zealand.
The International Journal of Prosthodontics
|July 10, 2010
Summary
Long-term studies show that mandibular two-implant overdentures are successful with various loading protocols and attachment systems. Minimal marginal bone loss occurred, regardless of the chosen protocol, indicating implant stability.
Area of Science:
- Dental Implantology
- Prosthodontics
- Periodontology
Background:
- Mandibular two-implant overdentures offer a stable solution for edentulous patients.
- Evaluating long-term outcomes of different loading protocols and implant characteristics is crucial for clinical practice.
Purpose of the Study:
- To assess long-term marginal bone levels in patients with two-implant supported mandibular overdentures.
- To compare conventional and early loading protocols with varying implant surfaces and attachment systems.
Main Methods:
- 106 edentulous participants received two-implant overdentures with unsplinted prostheses.
- Participants were randomized into three loading groups (2, 6, or 12 weeks) with different implant systems and attachments.
- Marginal bone levels were measured radiographically over 10 years, with 79 participants completing the study.
Main Results:
- Minimal long-term marginal bone loss was observed across all loading protocols.
- Most bone remodeling occurred within the first year; roughened implant surfaces showed potential benefits.
- Loading protocol and implant surface significantly influenced early bone loss, while attachment systems had minimal impact.
Conclusions:
- Mandibular two-implant overdentures are viable long-term with 2, 6, or 12-week loading protocols, independent of the attachment system.
- Minimal bone loss may relate to long-term edentulism effects on basal bone.
- Current implant success criteria may require revision for stricter evaluation.
