A dental crown is a tooth-shaped "cap" that is
placed over a tooth - covering the tooth to restore its shape and size,
strength, and/or to improve its appearance.
The crowns, when cemented into place, fully encase the
entire visible portion of a tooth that lies at and above the gum line.
Why Is a Dental Crown
A dental crown may be needed in the following situations:
To protect a weak tooth (for instance, from decay) from
breaking or to hold together parts of a cracked tooth
To restore an already broken tooth or a tooth that has been
severely worn down
To cover and support a tooth with a large filling when there
isn't a lot of tooth left
To hold a dental bridge in place
To cover misshapened or severely discolored teeth
To cover a dental implant
What Types of Crowns
Permanent crowns can be made from all metal,
porcelain-fused-to-metal, all resin, or all ceramic.
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-metaldental 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.
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-porcelain dental crowns provide the best natural color match than any
other crown type and may be more suitable for people with metalallergies.
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.
permanent. Temporary crowns can be made in your dentist's office whereas
permanent crowns are made in a dental laboratory. Temporary crowns are made of
acrylic or stainless steel and can be used as a temporary restoration until a
permanent crown is constructed by the dental laboratory.
1.We’ve all done a hand check,
right? But other than a false sense of security -- or maybe a hand that smells
-- what does it prove? Not much. But what we do know is you are what you eat.
When you eat, food starts to be digested in your mouth. Bacteria break down food
particles and releases sulfur compounds that are involved in bad breath.
2.Another cause is poor oral
health. Bacteria from tooth decay or gum problems will linger in your mouth
like a vacationing guest at your house, so ask yourself: Are you really brushing
and flossing as you should? Are you using an antibacterial mouthwash? A more
severe problem, like gingivitis or periodontal disease, will require
professional intervention. So visit your dentist regularly as part of your
battle against halitosis.
3.Speaking of bacteria, your tongue
can be a magnet for unpleasant germs and smells, so don’t forget it when you’re
brushing. If your tongue feels like it needs to be shaved with a razor,
brushing may not be enough. If that’s the case, use a tongue-cleaning device to
scrape it clean. You might even get one free when you see your dentist.
4.It may seem obvious, but eau du
tobacco … no. If you want fresh breath, don’t smoke.
5.How wet is your whistle? Saliva
is the body’s natural way of keeping your mouth cleansed, and the salivary
gland doesn’t work as well if your well is dry.
6.Finally, persistent bad breath
could be the sign of a major medical problem, like acid reflux, sinus
infections, diabetes, or kidney problems. So make sure you get regular medical
checkups and follow any special instructions your doctor may give you.