الفهرس 
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Abstract
Introduction: Numerous investigations give evidence of improvement of masticatory
performance and alveolar bone surrounding the natural remaining two canines
when patients have had mandibular overdenture retained by different types of stud
attachments. A radiographic comparative study was carried out on overdenture
retained by two different type of stud attachment (Ball and Socket and OT-Cap
Equator system) constructed on two remaining lower canines.
Materials and methods: Twelve patients were grouped into two groups, six of them
use Ball and Socket attachment and the others use OT-Cap Equator system.
Radiographic evaluation was made by intra-oral digital radiograph DIGORA system.
The measurement includes the bone height and bone density surrounded the
supportive canines.
Result: All measurements were repeated from 0 to 3, 6 and 12 months and the
average was calculated. Paired t-test was used to compare between right and left
sides. It was also used to study the changes by time in each group. Student’s t-test
was used to compare between the two groups. The significance level was set at P <
0.05.
Conclusion: A tendency for test subjects with uses of OT-Cap Equator system
preserves the bone height and density more than the other type.