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A five-year multi-practice clinical study on posterior resin-bonded bridges
R J De Kanter1, N H Creugers, C W Verzijden
1Department of Oral Function and Prosthetic Dentistry, Dental School, University of Nijmegen, The Netherlands.
Journal of Dental Research
|April 16, 1998
Summary
Modified preparation designs and maxillary placement improve posterior resin-bonded bridge survival. While bonding systems showed no significant difference in complete survival, specific combinations impacted functional survival, with grooves in abutment teeth proving beneficial.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Clinical Trials
Background:
- Posterior resin-bonded bridges (RBBs) exhibit lower retentiveness compared to anterior RBBs.
- Optimized bonding procedures and preparation designs may enhance the durability of posterior RBBs.
- Understanding factors influencing RBB survival is crucial for long-term clinical success.
Purpose of the Study:
- To evaluate the influence of bonding systems and preparation designs on the survival and clinical functioning of posterior resin-bonded bridges (RBBs).
- To compare 'complete' survival (no debonding) and 'functional' survival (including successful rebonding) over at least 5 years.
- To identify factors affecting the long-term success of posterior RBBs.
Main Methods:
- A randomized controlled clinical trial was conducted to assess different posterior RBB designs.
- Evaluated bonding systems included etching/Clearfil F2, sandblasting/Panavia EX, and silica-coating/Microfill Pontic C.
- Preparation forms compared were conventional versus modified, with survival analyzed using Cox's Proportional Hazards model.
Main Results:
- No significant differences in 'complete' survival were found among the tested bonding systems.
- Modified preparation forms showed a statistically significant advantage for 'complete' survival (62% vs. 46%).
- Maxillary RBBs demonstrated higher 'complete' (65%) and 'functional' (89%) survival rates than mandibular RBBs (40% and 68%, respectively).
- The silica-coating/Microfill Pontic C system showed higher 'functional' survival (90%) in rebonded cases.
Conclusions:
- Preparation of grooves in abutment teeth significantly enhances the survival of posterior resin-bonded bridges.
- Maxillary RBBs have a better prognosis for survival compared to those placed in the mandible.
- Bonding systems tested did not significantly influence the overall failure rate, but specific combinations impacted functional survival.