الفهرس 
Effect of cross arch stabilization on the stresses induced in an abutment of a unilateral distal extension partial denture using a resilient extracoronal attachment: (IN VITRO STUDY)
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Abstract
Unilateral free end saddle cases are very challenging for the patient and the prosthodontist due to the importance of cross arch stabilization. According to the basic principles of partial denture construction, crossing the arch is a must for proper reciprocation, support and reduced stresses on the abutments but bilateral design of the partial denture is very annoying for the patients as it is bulky and may interfere with mastication and speech. So, unilateral removable partial denture is more preferable by the patients.
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.
Anatomical model was constructed to simulate a mandibular unilateral free end saddle case; first and second molars were removed. First and second premolars were prepared to receive two units fixed crowns to which the extracoronal attachment (rk-1 Uni) was attached during casting. Two removable partial dentures were fabricated; unilateral removable partial denture and bilateral one. Strain gauges were attached to the mesial, distal, buccal and lingual surfaces of the premolars. Loads were applied on first molar area of both dentures at baseline(time of insertion) and other loads were applied after 2000 times of insertion and removal for both dentures then, microstrains were recorded for each denture.
This study found that there is a statistically significant difference in microstrains for each group after insertion/removal cycle. At baseline, there was a statistically significant difference between both dentures whereas stresses were higher in bilateral denture than the unilateral one. After insertion/removal cycle which representing 2 years of follow up, non-statistically significant difference was found between both dentures.