الفهرس 
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Abstract
Compare between retention of ball & socket and OT. Cap equator attachment used
in mandibular over denture.
Material and Methods: In this comparative study, twelve patients with only
remaining two lower canines were selected from the out patient’s clinic of Cairo
University, with ages ranges from (40-65) under certain patient selection criteria
which are:
• Their ridges were fairly well developed and were well covered by firm
healthy mucosa
• Free from any systemic or oral diseases especially those that might affect the
retention
• All patients had an angle class I maxillo-mandibular relationship
• Patients with good oral hygiene and normal tongue size.
Each Patient had received a mandibular tooth supported over denture with two
attachments placed in their endodontically treated lower canines which classified
into two groups:
• group I patients: received “ball and socket” resilient attachment
• group II patients: received “OT Cap equator” resilient attachment
For each group of patients the following was done:
• After visual , digital and radiographic examinations were accomplished
• Endodontic therapy for both canines in each group
• Reduction of the crown in height with all surface inclination to create dome
shape leaving from 2 to 3 mm above the gingival margin
• Metal copings were cemented to the abutments after making post, core and
head of the attachment as a one unit
• Before fixing the attachment, a pesso reamer was used to create a space for
them inside the canal
• Impressions were taken and conventional steps of denture construction
were followed
• The attachments were cemented inside canals
• Direct pick-up technique used to fix the metal housing in the denture fitting
surface
Keywords: Mandibular Over Denture -Retentive Qualitie.