Prosthodontics is the specialty of dentistry that studies supporting structures of teeth, diseases, and conditions that affect them.
What propose Prosthodontics?
Prosthodontics is a technique used to restore teeth, using fixed and removable restorations ,tooth wear, dental inlay.
What is the difference between inlay and onlay restorations?
- An inlay is a restoration which lies within the confines of the cusps. These restorations are considered to be more conservative than onlays or crowns because less tooth structure is removed in preparation for the restoration. They are usually used when tooth destruction is less than half the distance between cusp tips.
- An onlay is a method of tooth restoration, which covers, protects or reinforces one or more cusps. Onlays are methods for restoring teeth in an indirect way. Onlays are often used when teeth present extensive destruction due to caries or to trauma.
What is a dental bridge ?
Dental bridge also known as a fixed partial denture, is a dental restoration used to replace a missing tooth by joining permanently to adjacent teeth or dental implants. Typically, conventional and cantilever bridges require shaping of the teeth surrounding a missing tooth .The materials used for the bridges include materials compatible with the body .
What is the difference between materials used for bridges?
- Metal material lasts longer
- Plastic materila is used in temporary crowns and bridges because plastic has abrasive and compresive low endurance
- Metal matrix composite material that have both metal components and abrasive lasting acrylic which is also color lasting in time
- Metal ceramic material include both long lasting metals : (Cr-Ni , Au) and porcelain which is also long lasting and aesthetically superior.
Dental crown types :
- Metals used in crowns include gold alloy, other alloys (for example, palladium) or a base-metal alloy (for example, nickel or chromium). Compared with other crown types, less tooth structure needs to be removed with metal crowns, and tooth wear to opposing teeth is kept to a minimum. Metal crowns withstand biting and chewing forces well and probably last the longest in terms of wear down. Also, metal crowns rarely chip or break. The metallic color is the main drawback. Metal crowns are a good choice for out-of-sight molars.
- Porcelain-fused-to-metal dental crowns can be color matched to your adjacent teeth (unlike the metallic crowns). However, more wearing to the opposing teeth occurs with this crown type compared with metal or resin crowns. The crown’s porcelain portion can also chip or break off. Next to all-ceramic crowns, porcelain-fused-to-metal crowns look most like normal teeth. However, sometimes the metal underlying the crown’s porcelain can show through as a dark line, especially at the gum line and even more so if your gums recede. These crowns can be a good choice for front or back teeth.
- All-resin dental crowns are less expensive than other crown types. However, they wear down over time and are more prone to fractures than porcelain-fused-to-metal crowns.
- All-ceramic or all-porcelain dental crowns provide the best natural color match than any other crown type and may be more suitable for people with metal allergies. However, they are not as strong as porcelain-fused-to-metal crowns and they wear down opposing teeth a little more than metal or resin crowns. All-ceramic crowns are a good choice for front teeth.