الفهرس 
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Abstract
Aim: The aim of this in-vitro study was to compare the retention of unilateral attachment retained
removable partial denture with crossing the arch for stabilization versus not crossing the arch. The
retention was measured using universal testing machine.
Methodology: Mandibular epoxy model was made simulating unilateral free end saddle case with
missing right first molar and second molar. The right first and second premolars were prepared to
receive surveyed crowns with attached patrices of “rk-1 uni” attachment. Two metal framework
designs were made with matrices of “rk-1 uni” attachment casted to it. The first design was unilateral
design without cross-arch stabilization. The second design was a conventional denture with crossarch stabilization using double Aker clasp on the dentate side. A ready-made hook was attached to
the unilateral design. A metal bar with a ready-made hook was attached to the second design. The
hooks were used to help in measuring the retention with the Universal Testing Machine, at a speed
of 0.5 mm/min. Measurements were done initially, after 500, 1000, 1500 & 2000 insertion/removal
cycles which simulate 2 years of use by the patient.
Results: Statistically significant difference was found between retention of both designs (p<0.001).
The denture with cross arch stabilization had higher retention than the unilateral denture. Both
dentures lost retention over time. Then retention increased again after 1500 cycles. At the end of the
2000 cycles, the denture with cross arch stabilization had higher retention than the unilateral denture
design.
Conclusion: The unilateral denture design, had less retention than the denture with cross arch
stabilization. It also lost more retention than the denture with cross-arch stabilization. Although both
dentures, had initial acceptable retention force, above 5 N, yet the denture with cross-arch
stabilization remained with superior retention than the unilateral denture after 2000 cycles.