الفهرس 
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Abstract
One of the basic principles of tooth preparation in fixed prosthodontics is conservation of sound tooth structure in order to preserve tooth vitality and reduce postoperative sensitivity. Conservative preparation designs such as inlay-retained fixed partial dentures (IRFPDs) are much less invasive than conventional full coverage preparations. With the introduction of new adhesive materials, the adhesive material should not only act as adhesive but also should support the remaining tooth structure.
The aim of this study was to clinically assess two inlay retained bridge designs (tub shaped and inlay shaped) in missing posterior teeth cases.
A total of 30 cases were included and divided into two main groups with 1:1 allocation ratio. (n=15 for each group) according to the bridges design fabricated.
1- group 1: the control group: Inlay shaped preparation group: this group consisted of patients with missing single posterior tooth and received an inlay retained bridge with inlay design on both abutments.
2-group 2: the intervention group: Tub shaped preparation group: this group consisted of patients with missing single posterior tooth and received an inlay retained bridge with tub design on both abutments.
The inlay retained bridges were constructed from monolithic zirconia (katana) and cemented using Theracem™ self-adhesive resin cement after treating the fitting surface of the bridges mechanically (sandblasting) and chemically (phosphate ester monomer). The clinical assessment of the retention, marginal adaptation, secondary caries, fracture and gingivitis was done following the MUSPHS criteria.
The results of this study clarify that there was no statistical difference between both groups regarding retention, marginal adaptation, secondary caries, fracture and gingivitis in missed posterior tooth cases.
Conclusions:
Within the limitations of this study, the following conclusions can be drawn:
1-Monolithic zirconia inlay retained bridges with inlay and tub designs cemented with resin cement represented a clinically successful restoration functionally and biologically.
2-Regarding retention, marginal adaptation, secondary caries occurrence, fracture and gingivitis, both inlay designs exhibited comparable outcomes.