IADR Abstract Archives
Bilateral Distal Extension Removable Partial Overdenture Retained by O-ring Attachment
Objectives: The purpose of this study was to evaluate the influence of the spacer on reducing the stresses transmitted to abutment teeth retaining a RPOD for mandibular bilateral distal extension case using O-ring attachment.
Methods: Two designs were tested according to use of spacer between denture base and abutment teeth during picking up the O-ring attachment as follows:
Design І used without a spacer.
Design ІІ same as design one but used with spacer between the denture base and the abutment teeth
The two designs were loaded 10 times with a controlled vertical static load of 60 N for 15 seconds unilaterally and bilaterally, micro strains were recorded from three surfaces (distal, buccal, and lingual) of the abutment teeth.
Results: 1- The stresses were significantly reduced for the second design in which a spacer was used in both loading positions on the loaded and unloaded side.
2- The lateral forces were markedly directed toward the buccal side more than lingual side in both designs regardless of using the spacer.
Conclusions: 1- It is very important to use spacer with resilient attachments retaining a partial overdenture in order to minimize the forces exerted on the abutment teeth.
2-Most of the lateral forces were directed to the buccal side of the abutment teeth.
Recommendations:-
-Periodic monitoring of the buccal side of the abutment teeth when using a resilient attachment.
-Further investigation is needed to evaluate the stresses directed to the residual ridge of with or without spacer
Methods: Two designs were tested according to use of spacer between denture base and abutment teeth during picking up the O-ring attachment as follows:
Design І used without a spacer.
Design ІІ same as design one but used with spacer between the denture base and the abutment teeth
The two designs were loaded 10 times with a controlled vertical static load of 60 N for 15 seconds unilaterally and bilaterally, micro strains were recorded from three surfaces (distal, buccal, and lingual) of the abutment teeth.
Results: 1- The stresses were significantly reduced for the second design in which a spacer was used in both loading positions on the loaded and unloaded side.
2- The lateral forces were markedly directed toward the buccal side more than lingual side in both designs regardless of using the spacer.
Conclusions: 1- It is very important to use spacer with resilient attachments retaining a partial overdenture in order to minimize the forces exerted on the abutment teeth.
2-Most of the lateral forces were directed to the buccal side of the abutment teeth.
Recommendations:-
-Periodic monitoring of the buccal side of the abutment teeth when using a resilient attachment.
-Further investigation is needed to evaluate the stresses directed to the residual ridge of with or without spacer
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