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Class V cavities are on the surface of the teeth closest to the face or tongue and do not involve any pits or grooves. Class VI cavities are on the edges of the front teeth, or on the part of the back teeth that touch the jaw.
Challenge of shaping the contact point. A Class II restoration has to recreate not only the natural contour of the tooth, but also the corresponding proximal contact. Many dentists consider this point, in particular, to be the most demanding part of the treatment.
Class II Amalgam Preparation
- PREPARATION OF AN IDEAL CLASS II CAVITY CARIOUS LESIONS ON PROXIMAL SURFACES.
- STEPS IN CAVITY PREPARATION FOLLOW THE PROCEDURE FOR PREPARING CLASS I.
- ORIENTATION OF THE BUR IS THE KEY IN PREPARATION.
- WITH A SWEEPING DRAG, MAINTAINING THE SAME DEPTH AND BUR ORIENTATION, CUT THE TOOTH TOWARDS MESIAL PIT.
Restorative Technique - Class IVThis Class IV technique first takes you through preparation of tooth structure. Then you will see the placement of a microhybrid or nanofill composite to replicate the lingual shelf. This stage is so important because you are building the foundation for the restoration.
Class 2 – Patients who have oral conditions that, if not treated or followed up, have the potential but are not expected to result in dental emergencies within 12 months.
In fact, there are six classes of cavities based on the tooth type and the location of the decay, as well as four classifications that describe the severity of decay.
Class 3: Patients who require urgent or emergent dental treatment. Class 3 patients normally are not considered to be worldwide deployable. Treatment or follow-up indicated for dental caries, symptomatic tooth fracture or defective restorations that cannot be maintained by the patient.
Class I Caries affecting pit and fissure, on occlusal, buccal, and lingual surfaces of molars and premolars, and palatal of maxillary incisors. Class II Caries affecting proximal surfaces of molars and premolars. Class V Caries affecting gingival 1/3 of facial or lingual surfaces of anterior or posterior teeth.
On incisors, canines and premolars, Class V cavities are typically restored with resin composite, however, on molars they are either restored with resin composite or amalgam. Resin-modified glass ionomer can also be used for their restoration, however, resin composite provides superior esthetics.
Polymerization shrinkage is inherent to the curing of methacrylates. The only known methods to reduce shrinkage are to reduce the number of methacrylates or utilize a new polymerization chemistry. The silorane-based restoratives (Filtek Silorane, 3M) are an example of novel chemistry in a commercial composite resin.
Curing techniqueIt has been found that polymerization shrinkage is greatly reduced in pulse delay curing with a delay of 3–5min. Soft-start polymerization is also found to reduce the polymerization shrinkage because it allows for slow initial rate of polymerization.
A polymer occupies less volume than the monomers, the effect of which is well known as polymerization shrinkage. During polymerization the distance between monomer chains is reduced when the weak van der Waals forces are converted into covalent bonds. 5.
Polymerization, in polymer chemistry, is the process of reacting monomer molecules together in a chemical reaction to form three-dimensional networks or polymer chains. The resulting polymer, if properly processed, is a highly cross-linked, three-dimensional infinite network.
When a material is cured without bonding to cavity walls, the material is able to shrink and to flow, developing low values of stress. Consequently, the main outcome is the development of internal contraction stress which can damage the marginal seal of the bonded restorations.
Bulk-fill resin composites are light-cured resin composites that can be placed in increments or layers of 4 to 5 mm in depth. These materials have been available to the dental profession for several years now. Their adoption has been slow, but they are gaining popularity, and sales are increasing.
Polymerisation is the process in which the small monomer units join together to form a large polymer molecule.
A Composite Filling is a tooth-colored plastic and glass mixture used to restore decayed/carious teeth. Composites are also used for cosmetic improvements of the smile by changing the color of the teeth or reshaping disfigured teeth.
The use of an incremental filling technique can compensate polymerization shrinkage effects and perhaps decrease tensile stress concentrations at the restoration interface25, 26 and reduce the cuspal strain.
The reverse curve is used wherever indicated in proximal boxes to create a butt joint margin without destroying excessive tooth structure. However, they are generally necessary on the buccal portion of the proximal box. In some cases, they not be necessary at all.
DISCUSSION. Cavosurface angle is the angle of the tooth structure formed by the junction of a prepared wall and the external surface.[9] Various theories have been proposed for the orientation of the walls and the corresponding AMA.
Angle. An angle is formed when two lines intersect each other. We represent an angle by the symbol ∠. An angle involves two legs and one common vertex at which two lines meet. For example: ∠AOD is formed when line AB and CD intersect with each other.
ax·i·o·pul·palReferring to the line angle formed by the junction of an axial and pulpal wall of a tooth cavity.
Location: Proximal surfaces of premolars and molars Materials: The transition between the occlusal and proximal cavity is termed isthmus. This is the narrowest place of preparation and it is of fundamental significance for retention of the filling.
In addition to this, we need to consider the cavosurface angle. This is the angle between the surface of the tooth and the cavity walls. In an amalgam cavity, we aim for an angle of 90°. This is once again to protect the margins of the restoration.
Many class III preparations are done to an initial axial wall depth of 0.2mm into dentin.
These are: 1-Establishing outline form 2-Obtaining resistance form 3- Obtaining retention form 4- Obtaining convenience form 5- Removing remaining caries 6- Finishing cavity walls and margins 7- Performing toilet of the cavity.
Class I restorations restore defects on the occlusal surface of posterior teeth, the occlusal thirds of the facial and lingual surface of molars, and the lingual surfaces of maxillary anterior teeth.
