الفهرس 
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Abstract
The Bite registration is an interocclusal record which defined as an accurate and precise recording of maxillo-mandibular relationship. An accurate transfer of the interocclusal relationship to the articulator is essential for the fabrication of prosthesis. The accurate articulation of working casts results in less time spent adjusting occlusion.
This study was carried out to evaluate the dimensional accuracy of conventional bite registration material and CAD/CAM bite registration material and also to show the effect of edentulous span on the accuracy of the materials in patients with a single missing tooth and fully dentate. Two type of patient were selected in the present study: fully dentate (10 patients who needed a posterior crown) and one missing tooth ( 10 patients who needed a posterior fixed partial denture ). A 3 cm in length wire was bonded on adjacent teeth for the preparation in a horizontal position and another in a vertical position, so it can be recorded after bite registration material setting. A stereomicroscope was used for measurements.
In the present study; regarding the effect of duration on the restoration dimensional accuracy of bite registration materials at horizontal and vertical centric and eccentric occlusions, there was statistical significant differences between immediate and later who recorded higher values with both types of bite registration materials tested. A statistical significant differences was found also between the two types of occlusion irrespective to the duration, type of restorations and types bite registration materials, as eccentric occlusion recorded higher values.