MERCURY AMALGAM METAL FILLINGS
Amalgam fillings are the NHS standard. Used for many years on the NHS because they work well, historically. However, long term metal mercury fillings do tarnish black and do get brittle and hence crumble.
Composite resin dental fillings were researched and made as a better alternative to traditional mercury metal amalgam fillings. They are colored to look like natural teeth, hence creating a tooth look precisely like a tooth. Composite resin fillings are very durable and help make a natural-looking smile. Modern scientific studies do show that the compressive strength of Composite resin is as good as or even better than mercury amalgam metal fillings.
The two main types of Inlays and onlays are made from composite resin or porcelain. Gold versions also exist, and metal ones can be done on the NHS. However, the inlays and onlays are often more appealing as porcelain and resin as they can be contoured and colored to look very natural. Hence dental inlays and onlays a popular choice for those wanting to replace unattractive metal fillings.
This type of dental product is bonded onto the toot as the animation shows. Onlays cover the Cusp, where the fracture is possible.