tailieunhanh - Ebook Essentials of dentistry - Quick review and examination preparation: Part 2

(BQ) Part 2 book ” Essentials of dentistry - Quick review and examination preparation” has contents: Gingival curettage, infrabony pocket, bone replacement grafts, definitions and questionnaire for periodontia viva voce, considerations for oral medicine viva voce, definitions in pedodontia, and other contents. | CHAPTER 20 Scalers and Curettes Differences between scaler and curette Scaler Curette Use Supragingival scaling (primary use) Subgingival scaling (secondary use) Subgingival scaling, root planing, curettage (primary use) Blade Thicker Finer Working tip Converge to pointed tip (Fig. ) Round toe (Fig. ) Working edge 2 working edge (Fig. ) Universal – 2 Area specific – 1 (Outer, convex) (Fig. ) Design Heavy Fine, delicate, vital Insertion Only 1 mm subgingivally More subgingivally Adaptation Adequate (Doesn’t adapt to root surface properly) Good (Possible to adapt to deeper areas) Triangular Semicircular or spoon shaped Stroke Scaling stroke – Short, powerful, pull Root planning stroke – Moderate to light, pull Curvature Curved in one plane Curved in two plane Types U 15/30, Ball and Indiana Jaquette sickle # 1,2 and 3 Curved 204 sickle Nevi 2 posterior sickle scaler Two basic types; Universal – Barnhart – Columbia Area specific – Gracey – Langer Cross section Scalers and Curettes 135 Essentials of Dentistry Fig. : Features of scaler Fig. : Design of scaler Essentials of Dentistry 136 Scalers and Curettes Fig. : Features of curette Fig. : Design of curette Scalers and Curettes 137 DIFFERENCES OF GRACEY CURETTE AND UNIVERSAL CURETTE (FIG. AND B) Gracey curette (Fig. ) Universal curette Area and surface specific Different designs for different areas Universal—Only one curette is used for all teeth by changing position of blade, fulcrum, adaptation and finger rest Cutting edge One cutting edge is used, . work with outer edge only Both cutting edges are used, . work with either inner or outer cutting edges Blade Curved in two planes. Blade curves up and to the sides Curved in one plane. Only upwards and not to the side Blade angle Offset blade: face of blade is beveled at 60° to 70° from the lower shank Not offset blade: face of blade is beveled at 90° to lower