What is an onlay restoration?
An onlay restoration is a custom made filling made of composite material, gold, or tooth-colored porcelain. An onlay is sometimes also referred to as a partial crown. It is made by a professional dental laboratory and is permanently cemented onto the tooth by your dentist.
What is amalgam restoration?
Dental amalgam is considered a safe, affordable and durable material that has been used to restore the teeth of more than 100 million Americans. It contains a mixture of metals such as silver, copper and tin, in addition to mercury, which binds these components into a hard, stable and safe substance.
Which is the main reason of replacing amalgam restoration?
Conclusions: In Jordan, the main reason for first placement of amalgam restoration is primary caries, the main reason for replacement is secondary caries.
What is the minimum thickness for amalgam restoration?
The minimum thickness for amalgam is 1.5mm, 1-2mm for cast metal and 2mm for porcelain.
Are onlays better than fillings?
An inlay is a restoration that repairs the top portion of a tooth, and an onlay replaces the cusp of a tooth. They offer many advantages over tooth-colored fillings since they are stronger, more durable, and more stain resistant.
Do dentists do onlays?
Dental onlay and crown To avoid removing healthy tooth structure, the dentist may opt to use a dental onlay instead of a crown. Onlays can help to preserve as much healthy tooth as possible.
How is amalgam self sealing?
This is a result of a mechanism that ensures self-sealing of the amalgam to the prepared cavity walls. This quality occurs as a result of percolation of oral fluids between the amalgam and the tooth, which results in corrosion and the buildup of corrosion products in the microscopic interface.
Do dentists use mercury fillings anymore?
Currently, there are millions of amalgam dental fillings in use and they continue to be placed in dental schools, clinics and hospitals all over the world. They are considered safe and stable, yet their use continues to be debated, says dentist Nathan Janowicz, DMD.
What are the most common reason for amalgam failure?
Conclusion: The most common reason for failure of amalgam restoration is bulk fracture of amalgam which is a result of faulty cavity preparation.
Can you repair an amalgam?
Repair of amalgam restorations has been considered to be a viable, cost-effective alternative treatment to complete replacement. It allows removal of localized defects with maximal preservation of tooth structure.
How much would you reduce a cusp to be replaced with amalgam onlay?
The depth cuts should be a minimum of 2 mm for functional cusps and 1.5 mm for nonfunctional cusps.
Where would you find a Class 1 restoration in the mouth?
Class I: Cavity in pits or fissures on the occlusal surfaces of molars and premolars; facial and lingual surfaces of molars; lingual surfaces of maxillary incisors (Class I corresponds to surfaces of a posterior tooth you can clinically see—occlusal/lingual/buccal surfaces.
How are inlays and onlays similar to crown preparation?
The preparation of inlays and onlays mainly follows the same basic concepts of indirect restorations. The aim of tooth preparation is to preserve more tooth tissue compared to a crown preparation, while giving an adequate amount of protection to the tooth.
How are inlays and onlays cemented in the mouth?
Inlays and onlays are cemented in the mouth using adhesive resin luting cements. These materials are placed in the inlay/ onlay and placed onto the prepared tooth. Once the onlay/ inlay is seated, the viscosity of the adhesive resin luting cement decreases.
Why are ceramic inlays better than composite fillings?
Inlays can give the restored tooth a natural, aesthetic appearance: ceramic inlays allow an excellent shade match that makes the restoration almost indistinguishable from the surrounding natural tooth Ceramic inlays have better physical properties than traditional resin composite fillings for posterior teeth
Are there any contraindications to providing Onlays and inlays?
Contraindications to providing Onlays and Inlays include plaque and active caries. It is important to ensure adequate oral hygiene before providing any indirect restoration as failure to manage the caries risk of an individual may result in recurrent caries.
