world-dental-2019-scientifictracks

6 / 11

World Dental 2019 Journal of Clinical Dentistry and Oral Health | Volume 3
Page 18
OF EXCELLENCE
IN INTERNATIONAL
MEETINGS
YEARS
December 11-12, 2019 | Dubai, UAE
DENTISTRY AND
DENTAL MATERIALS
4th World Congress on
EFFECT OF TELESCOPIC CROWN, MAGNETIC ATTACHMENT AND RPI CLASP ON
THE SUPPORTING STRUCTURES FOR LOWER KENNEDY CLASS I DENTURES
Maha Nagi Kamal 1, Rami Maher Ghali2 and Fatma El-Zahraa Awad2
1 British University in Egypt, Egypt
2 Ain Shams University, Egypt
Aim of the study: The aim of this study was to evaluate and compare the effect of RPI clasp, telescopic crowns
and magnets as retainers for Kennedy class I partial dentures on the supporting structures using digital radi-
ography.
Materials & Methods: Twenty one partially edentulous patients having Kennedy class I lower ridges with low-
er first premolar as last abutment were selected according to certain criteria. According to the type of direct
retainer, patients were divided into three groups: group I, received removable partial dentures retained by RPI
clasp; group II: received removable partial dentures retained by telescopic crowns exhibiting a 6 degrees ta-
per angle and Group III: received removable partial dentures retained by magnetic attachments. Radiographic
evaluation was performed to evaluate bone height mesial and distal to the abutments and the crestal bone
height at specially marked points on the residual ridge by serial standardized periapical radiographs made by
long cone paralleling technique.
Results: There was a statistically significant decrease in crestal bone height around the abutments, telescopic
attachment retainer showed the statistically significantly highest crestal bone loss around the abutment, while
RPI clasp retainer showed statistically significantly lower crestal bone loss followed by the magnetic attach-
ment retainer that showed the lowest crestal bone loss. However, regarding the effect of different direct re-
tainers on the residual ridge, there was a statistically significant decrease in the residual ridge height. RPI clasp
retainer showed the statistically significantly highest amount of bone loss, however, there were no statistically
significant differences between amounts of bone loss in telescopic attachment retainer and magnetic attach-
ment retainer, both showed the lowest mean amounts.
Conclusion: RPI clasp retained partial dentures distributed more stresses on the residual ridge rather than
on the abutment teeth. While, using telescopic retained partial dentures distributed more stresses on the
abutment teeth rather than on the residual ridge. Finally using magnetic retained partial dentures distributed
stresses more or less equally among the abutment teeth and the residual ridge compared to the other direct
retainers.
Maha Nagi Kamal et al., J Clin Dentistry Oral Health 2019, Volume 3
Maha Nagi Kamal has completed her PhD from Ain Shams University, Egypt. She works as Lecturer of removable prosthodontics at
BUE.
BIOGRAPHY