Dental fillings are divided into various types. These are Direct Restoration and Indirect Restorations.
A. DIRECT RESTORATIONS- They include the type of filling materials that are placed in the prepared cavity in a single visit. The materials included in this are resin composites, silver amalgam, glass ionomer cements, temporary filling materials etc.
B. INDIRECT RESTORATIONS- They include the filling materials that require more than 1 visit to be placed in the cavity. On the first day of appointment, the dentist prepares the tooth and makes an impression to record the details of the tooth to be restored. It is then sent to the dental lab. In the next visit, the material is placed in the prepared tooth. These include veneers, inlays, onlays, crowns and bridges fabricated with gold, base metal alloys, composites.
CAN BE USED IN
Composite resin is presently the most popular tooth colored filling material. Composite material is a compound of two or more different materials with properties superior or intermediate to those of the individual component. The various components of a composite resin are resin matrix, fillers, coupling agents, coloring agents.
a). The resin matrix initially used was Bis GMA(Bisphenol Glycidyl methacrylate). Now, UDMA( Urethane dimethacrylate) and TEGDMA(Triethylene glycol dimethacrylate) are also being used.
b). Fillers used are quartz, silica, tricalcium phosphate, zirconium dioxide. They provide strength, hardness, rigidity to the material.
Composites are divided into 3 types depending upon the size, amount and composition of the inorganic filler. These types are Conventional, Microfilled and Hybrid. Placement of a composite filling requires an etchent (like phosphoric acid) and a bonding agent.
Various advances have been made in composites, these are Flowable composites, Packable composites, Antibacterial composites, Laser curing composites.
Composite filling done to restore carious front tooth
Glass Ionomer Cement Dental Filling
INLAYS AND ONLAYS
An Inlay is an intracoronal cast restoration designed mainly to restore occlusal and proximal surfaces of the posterior teeth without involving the cusps of the teeth. They are custom made to fit the prepared cavity and then are cemented in that place. Its placement usually takes two appointments. During the first visit: an impression is made of the tooth and a temporary inlay is placed. The impression is then sent to a dental lab, which will make the inlay according to a particular tooth. On the second appointment: the temporary inlay is removed and permanent placed on the tooth.
An Onlay is a combination of intracoronal and extracoronal cast restorations when one or more cusps are covered. It is a more extensive reconstruction and indicated in areas where lots of tooth structure needs to be restored. It is made in the same way as an inlay and then the permanent onlay is securely bonded using high strength dental resin.
Porcelain inlays and onlays are highly recommended for anterior teeth since they are aesthetic and natural looking as compared to metal fillings. They are long lasting once bonded to the tooth surface and cover large decayed areas.
DIRECT FILLING GOLD
Gold foil is one of the earliest available dental filling materials.
Its available in various forms like gold foil sheets, pellets, ropes, laminated foil, platinized foil, mat gold, mat foil, powdered gold.
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