Exam (elaborations)
Crown Procedure.
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Exam of 5 pages for the course NUR 321 - problems with excretion - renal system p at NUR 321 - problems with excretion - renal system p (Crown Procedure.)
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Crown ProcedureA Gingival Retraction Cord - ANS-- A gingival retraction cord is a thin piece of cord,
similar to a piece of yarn, that is gently inserted around the tooth, into the gingival
sulcus
- Some dentists have adopted other techniques for isolating the tissue, such as gingival
curettage
Alginate Impressions - ANS-- The dental assistant will take alginate impressions of both
your upper and lower dental arches. These impressions will be poured in stone to
create a stone model of your teeth. The models will be sent to the dental laboratory for
use when making your crown
- A small impression of the teeth in the same quadrant of the tooth that requires the
crown and the opposing arch is also taken before the tooth is prepared. This impression
is used to fabricate a temporary crown for you to wear until your permanent crown
arrives back from the dental laboratory
- After the impressions have been finished, the dentist will then use a shade guide to
record the exact color of your tooth. If your crown involves one of your front teeth, your
dentist may ask you to visit the dental laboratory for the lab technician to take a custom
shade of the surrounding teeth
- If you have opted for a gold crown, there is no need to determine the shade of the
tooth
Broken Cusps - ANS-- Cusps frequently break off of teeth due to trauma or large
existing fillings
- Since the cusps are the part of the tooth that take the most stress during chewing, they
need to be completely covered or the tooth or filling will keep fracturing
- Sometimes the tooth breaks all the way to the bone, and a crown-lengthening
procedure is necessary
- This means the bone and gums need to be trimmed down below the edge of the
fractured part of the tooth so the margin of the crown can be placed on healthy, strong
tooth structure
Cracked Tooth Syndrome - ANS-- This is a condition whereby a patient has fractures
inside a tooth that cause pain when it is chewed on a certain way
- Chewing produces stress on fracture lines that make it feel like it is splitting apart
- A crown will hold the tooth together and redistribute the stress evenly throughout the
tooth, eliminating the pain in most instances
, - In these situations, it is best to leave a temporary crown on for a while to make sure
the pain goes away and the tooth doesn't require a root canal
Excessive Wear of Teeth - ANS-- If a person has a habit of grinding their teeth, the teeth
will become shorter over time
- The teeth can also wear away due to acid erosion caused by gastrointestinal acid
reflux (GERD), bulimia, or an acidic diet
- Sometimes, the enamel will wear away completely, leaving small, soft teeth
- Over time, the bite can collapse and the only way of restoring the teeth to normal size
is by covering the teeth with crowns
How Long do Dental Crowns Last? - ANS-- An average of 10 to 20 years
- Crowns are still subject to fracture and cavities, so it is important to take extra care in
brushing and flossing around crowned teeth to prevent them from needing replacement
too often
- When all-ceramic crowns or veneers are present, it is often advisable to wear a mouth
guard to protect the porcelain from fracturing and prolong the life of the crowns
How Much do Crowns Cost? - ANS-- The cost depends on the materials used, the
expertise of the dentist, and the expertise of the lab technician
- Insurance will typically cover part of the expense, but the amount varies with each
carrier and plan
- A person should expect to pay anywhere between $600 and $2,000
Step 1: Numbing the Tooth - ANS-- Use a local anesthetic to numb the tooth and
surrounding tissues
Step 2: Preliminary Impressions and Shade - ANS-- The dental laboratory that
fabricates your dental crown requires accurate models of both your maxillary and
mandibular arches, in order to create a perfect crown for your tooth
- If you have chosen a full ceramic or porcelain fused to metal crown (PFM), your dentist
will also require the exact shade of your tooth before he begins the preparation of the
tooth
- Alginate Impressions
Step 3: Preparing the Tooth - ANS-- Once the tooth and tissues have become numb, the
dentist may decide to place a rubber dam over the teeth involved. The rubber dam is
used to trap old filling material, tooth structure, and water from falling into your mouth
- The dentist must remove very precise amounts of the tooth and filling material from the
tooth that requires the crown
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