Dental Materials

Introduction The science of dental materials involves a study of the composition and properties of materials and the way in which they interact with the environment in which they are placed Selection of Dental materials The process of materials selection should ideally follow a logical sequence involving (1) analysis of the problem, (2) consideration of requirements, (3) consideration of available materials and their properties, leading to (4) c…

Physical reaction-cooling causes reversible hardening Chemical reaction-irreversible reaction during setting

Principles of cutting, polishing, and surface cleaning Surface mechanics for materials Cutting-requires highest possible hardness materials to produce cutting Finishing-requires highest possible hardness materials to produce finishing, except at margins of restorations where tooth structure may be inadvertently affected Polishing- requires materials with Mohs ./ hardness that is 1 to 2 units above that of substrate  Debriding-requires materi…

COMPOSITE RESINS Types Amount of filler-25% to 65% volume, 45% to 85% weight Filler particle size (diameter in microns) Macrofill 10 to 100 µm (traditional composites) Midi fill- 1 to 10 µm(small particle composites) Minifill— 0.l to 1 µm Microfill-: 0.01 to  0.1 µm (fine particle composites) Hybrid--blend (usually or  microfill and midifill or minifill and microfill) Polymerization method …

Model. Cast. and Die Materials Applications - Gold casting, porcelain and porcelain-fused–to metal fabrication procedures - Orthodontic and pedodontic appliance construction - Study models for occlusal records Terms a. Models-replicas of hard and soft tissues for study of dental symmetry b. Casts-working replicas of hard and soft tissues for use in the fabrication of appliances or restorations c. Dies :-  working replicas of one tooth (or …