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Strains Around Abutment Teeth with Different Attachments Used for Implant‐Assisted Distal Extension Partial Overdentures: An In Vitro Study
Author(s) -
ELsyad Moustafa Abdou,
Omran Abdelbaset Omar,
Fouad Mohammed Mohammed
Publication year - 2017
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12370
Subject(s) - premolar , abutment , strain gauge , molar , materials science , removable partial denture , implant , dentistry , orthodontics , universal testing machine , strain (injury) , medicine , composite material , ultimate tensile strength , structural engineering , anatomy , dentures , engineering , surgery
Purpose The aim of this study was to evaluate and compare strain around abutment teeth with different attachments used for implant‐assisted distal extension partial overdentures (IADEPODs). Materials and Methods A mandibular Kennedy class I acrylic model (remaining teeth from first premolar to first premolar) was constructed. A conventional partial denture was constructed over the model (control, group 1). Two laboratory implants were then placed bilaterally in the first molar areas parallel to each other and perpendicular to the residual ridge. Three additional experimental partial overdentures (PODs) were constructed and connected to the implants using ball (group 2), magnetic (group 3), and Locator (group 4) attachments. Three linear strain gauges were bonded buccal, lingual, and distal to the first premolar abutment tooth at the right (loading) and the left (nonloading) sides. For each group, a universal testing device was used to apply a unilateral vertical static load (50 N) on the first molar area, and the strain was recorded using a multichannel digital strainometer. Results Significant differences between groups and between sites of strain gauges were detected. Strains recorded for all groups were compressive (negative) in nature. Group 1 demonstrated the highest strain, followed by group 3 and group 4; group 2 recorded the lowest strain. For group 2, the highest strain was recoded at the lingual nonloading side. For group 1, group 3, and group 4, the highest strain was recorded at the buccal loading side. Conclusion Within the limitation of the present study, ball attachments used to retain IADEPODs to the implants were associated with lower strains around abutment teeth than Locator and magnetic attachments. The highest strain was recorded with conventional partial dentures.