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Polymerization systems

Polymerization systems

Condesable composite

Flowable composite

Hybrid composite

Microfilled composite

Microfilled composite

Macrofilled composite

Macrofilled composite

Classification of Resin based composite

Pigments

Coupling agent

Coupling agent

Small particles

Filler particles

Filler particles

Resin matrix

Matrix

Component of composite.

THE ORAL HEALTH GUIDE Show navigation DENTAL CEMENT PERMANENT AND TEMPORARY CEMENTATION Temporary and definitive indirect restorations (dental crowns, dental bridges, some removable partial dentures) are secured to abutment teeth with specific materials called dental cements. Therefore, the procedure is (improperly) named cementing or cementation. Prior to cementation, the practitioner checks all the important details (shade, shape, insertion etc.) and makes the necessary adjustments until the restoration perfectly fits. There are 2 types of cementation depending on the type of dental cement utilized : temporary and permanent (or definitive). Temporary cementation Temporary cementation utilizes soft materials called temporary dental cements. Temporary dental cements features They have a good grip on both teeth and dental restorations. They are very well tolerated by the dental tissues. The temporary cemented restorations are very easy to remove. They can protect a vital prepared tooth and help minimize sensitivity (between appointments). Under the influence of saliva, temporary cements dissolute in a short time. For this reason, definitive restorations that are temporary cemented must be permanently fixed in 3 to 6 weeks. They have a low resistance. Indications Provisional cementation is utilized in two situations : Fixing of temporary crowns or other temporary restorations A temporary crown is usually cemented in place with a soft temporary dental cement. This allows for easy removal when fitting the definitive restoration and re-fixing between appointments. temporary crown after fixing with temporary dental cement Temporary cementation of definitive restorations Some practitioners will temporarily cement some final restorations for the following reasons : to evaluate the restoration's contours and margins to assess the periodontal response of the restoration (especially the part of the restoration that penetrates bellow the gumline) to verify dental tissue adaptation to the new situation. If certain complications arise during this period (e.g. an abutment tooth's pulp inflammation), the restoration can be easily removed (without destroying it), the condition is treated then the reconstruction is permanently cemented. Permanent cementation Fixed dental restorations are permanently attached to the abutment teeth with specific dental cements (either resin cements or acid-base cements). These are hard, brittle materials formed by mixing powder and liquid together. Dental cements are used for a variety of dental and orthodontic applications, including use as luting agents, pulp-protecting agents or cavity-lining material. Furthermore, they are used to form an insulating layer under metallic or ceramic restorations, and protect the pulp from injury. Dental cements features They develop a strong bond with both the restoration and especially the teeth. It is argued that quality dental cements form a very resistant chemical bond with dental tissues. They are very well tolerated by the dental tissues. They provide good marginal sealing to prevent marginal leakage and protect the dental tissues from external stimuli They have excellent resistance, aesthetics and they do not dissolute in saliva or other oral fluids. Unfortunately, the resistance decreases when the thickness of the dental cement layer is too high. If a dental restoration doesn't perfectly fit onto the abutment teeth, the space between the tooth and the inside of the crown increases. Dental cements, as quality materials as they are, cannot fully compensate this lack of adjustment. The primary role of dental cements is to act as luting agents by filling the space between the inner walls of the dental crown and the prepared tooth. On the other hand, if a restoration is perfectly adjusted, high quality dental cements greatly increase the lifespan and prognosis. Cementation technique All dental crowns are cleaned and disinfected. A dental suction device is placed inside the mouth and teeth are isolated from saliva or other fluids.