The effect of surface roughness of crown preparations on retention of cemented castings

Effect of undercut placement on crown retention after thermocycling

“…It is well known in fixed partial prosthodontics that crown preparations should be made with a 5°-7° taper of axial walls with vertical grooves, if necessary, to resist displacement of a casting (Johnston, Phillips & Dykema, 1971). Research has shown that slots and coves (undercuts) in tooth structure provide an adequate level of retention for several restorative materials (Chan & Chan, 1987 eported in the literature that the effect of surface roughness on tooth structure prepared with diamond burs significantly increases the retentiveness of cast gold crowns (Witwer, Storey & Von Fraunhofer, 1986;Felton, Kanoy & White, 1987). During the last decade, research has focused on the addition of auxiliary retention by means of cement keys, in order to improve the retention of overtapered or overprepared crown preparations (Worley, Hamm & Von Fraunhofer, 1982).…”

Influence of Cement Film Thickness on the Retention of Implant‐Retained Crowns

“…The two factors, surface area and height, are closely linked, and it has been demonstrated that an increase in surface area and height increases retention form . With regard to the surface finish, it is generally accepted that a rougher surface area leads to higher retention . The type of cement is a much discussed issue, as a great variety of cements are on the dental market .…”

“…5,21 With regard to the surface finish, it is generally accepted that a rougher surface area leads to higher retention. 22,23 The type of cement is a much discussed issue, as a great variety of cements are on the dental market. 5 Some authors 24,25 recommend the use of provisional cements to facilitate retrievability without damaging the restoration or the implant and its abutment; however, this advantage is accompanied by poor physical properties, like low crown retention and high solubility.…”

Evidenced‐Based Criteria for Differential Treatment Planning of Implant Restorations for the Partially Edentulous Patient

“…Cement‐retained restorations may also be indicated for patients with limited jaw opening, but require 6 to 7 mm interach space as opposed to 4 mm for a screw‐retained design . Ideal cement retention will be contingent on factors such as taper, reciprocating walls, surface area and height, surface roughness, and type of cement . The choice of cement is limited to radiopaque compositions and may be dependent on intended retrievability and mechanical retention and resistance of the abutment .…”