Abstract
Polishing of dental ceramics has become an increasingly important procedure in restorative dentistry as allceramic restorations, which require post-cementation occlusal adjustment, are gaining in popularity. There are numerous studies in both dental and ceramic literature on polishing of dental ceramics and the effects of polishing on their mechanical properties. However, lack of standardization in polishing parameters, precludes comparison among these studies. A clear understanding is lacking of the relative roles and interdependence of handpiece speed, abrasive characteristic, and polishing load. This paper will discuss the mechanism of polishing and review the literature on polishing and its effect on the mechanical properties of ceramic restorations.
Highlights
INTRODUCTIONLDepartment of Conservative Dentistry Faculty of Dentistry University of Malaya 50603 Kuala Lumpur, Malaysia
LDepartment of Conservative Dentistry Faculty of Dentistry University of Malaya 50603 Kuala Lumpur, Malaysia2.3Department.of Restorative Sciences and Biomaterials Boston University Goldman School of Dental Medicine 100 East Newton Street Boston, Massachusetts 02118-2392Corresponding author - Rohana Ahmad understanding of polishing mechanisms will facilitate the search for an optimal polishing protocol that will serve as a guideline for dental practitioners to carry out a safe and effective polishing procedure
Minimization of surface roughness is important in controlling aesthetics, wear, mechanical properties, and plaque accumulation of dental ceramic restorations
Summary
LDepartment of Conservative Dentistry Faculty of Dentistry University of Malaya 50603 Kuala Lumpur, Malaysia. The wear flat rubs along the polished surface and, because of friction, dissipates energy mainly in the form of heat This temperature rise during polishing is an important consideration because it can adversely affect the surface properties by inducing residual stresses on the workpiece. Mechanical interactions of abrasive grains with the workpiece produce predominantly residual compressive stresses as a result of localized plastic flow (Figure 2). Residual tensile stresses are caused mainly by thermally induced stresses and deformation associated with the grinding temperature and its gradient from the surface into the workpiece. Any irregularities in the cutting process cause variations in the cutting force which can dynamically excite the machine-tool structure and lead to variations in the local depth of cut during successive passes of the wheel, thereby regenerating undulations or lobes on the workpiece. Some effort have been made by the researchers to control the handpiece speed and polishing load used
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