الفهرس 
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Abstract
Aim:The aim of this study was comparing the induced microstrains on the abutments when unilateral and bilateral removable partial dentures were used with extracoronal unilateral attachment (rk-1 Uni). The stresses were measured using the strain gauges technology.
Methodology: mandibular cast simulating unilateral free end saddle case with missed first and second molars was used. The last two premolars were reduced receiving two splinted crowns. rk- 1Uni attachment was used where its male part was soldered to the splinted crowns and the female part was attached to the denture. Two removable partial dentures were constructed; the first one was unilateral denture without crossing the arch while the other one was bilateral denture which crossed the arch using rigid lingual major connector and double aker clasp on first and second molars of intact side. Strain gauges were attached to the buccal, lingual, mesial and distal walls of the splinted
abutments. Seventy Newton load was applied on first molar area of edentulous side in both dentures, then the strains were recorded using strain-meter device. Stresses were measured twice; at baseline representing time of insertion and after 2000 times of insertion/removal whichrepresenting
2 years of follow up.
Results: there was a statistically significant difference between unilateral and bilateral dentures at
baseline (p=0.038) while no statistically significant difference was found between the two dentures
after insertion/removal cycle (p=0.800). For each denture, there was a statistically significant
difference in stresses between baseline and after insertion/removal cycle whereas (p<0.001) for
unilateral denture and (p =0.010) for bilateral denture.
Conclusion:use of unilateral and bilateral denturesretained by rk-1 Uniproduce stresses on abutments
however, no significant difference was found between the dentures after insertion/removal
cycle.