How to Make a Study Cast for Dental Restoration
ENGL 1010-Composition 1 3 October 2011 How to make a study cast for dental restoration Any type of dental restoration placed in or on a tooth is a prosthesis, because it replaces a “missing part of the body”.
In commom usage, a dental prosthesis is a device or restoration that replaces one or more missing teeth, the entire crown of a tooth, or a portion thereof.Some of the significant terms associated with fixed restorative techniques can be best understood by giving a brief description of the procedures required to make a study cast for restoration. A dentist first “prepares” the tooth or teeth that will be restored. Such teeth are then referred to as preparations. An impression (a negative reproduction of a give n area of theoral cavity) is made by using a suitable impression material.
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The impression is then filled with artificial stone similar to plaster that will harden to form a cast, which is a positive reproduction of an area of the oral cavity. Impressions and casts may reproduce both hard and soft tissues. Gather impression, the dentist should have sent over an impression of the patients mouth. Clean excess blood off of the impression and shake to dry as much as possible.Assemble needed materials, look in the cabinets and get a bowl, spatula, debubblizer, diestone, separator, glue, scale, whipmixer, pindex machine, water, model trimmer, and pins and boots.
Turn on viberator, the viberator needs to be turned on at this point in time, because once you have mixed the material you need to be ready to pour it into the impression.The viberator is used to move the die stone preparation on to the impression. Next measure your water, and die stone. You will need twenty-two mililiters of cold water, and one hundred grams of die stone. Go ahead and spray the impression with the debubblizer. The debubblizer is used to reduce surface tension and prevent bubble formation in stone or plaster models.
Mix your materials, pour the die stone in the bowl and add the ater, stir ingredients with spatula until thick next, put the top on the bowl and insert the hose on the whipmixer, and attach bowl. Turn on power and let mix for forty-five seconds, or until thick and creamy like cake mixture. Pour the mixed die stone in impression, place impression on the viberator holding with one hand slowly pour whipped die stone into impression. Top should be as thick as your pinky finger.Set to dry, allowing forty-five minutes to dry, and remove cast from impression. Take the dry cast, and prepare to trim and pin it.
Trim and pin the finished cast, using the model trimmer, clean excess die stone and smooth out cast so, that it stands evenly and has enough space to be pinned. Take a marker and mark the places that you are going to place the pins, drill holes for pins, and glue pins in holes. Let dry for two minutes.Prepare to make base for cast. Using the same steps that you used for mixing the die stone, but this time only use 50 grams of die stone and eleven mililiters of water, because the base does not take as much die stone as the actual cast.
Using the brush lightly brush the seperator on the cast and place inside the base, making sure it is evenly lined up with the buccal side and right in the middle of the base. Let dry for forty five minutes.Remove cast from base and drill holes in the bottom of the base where the pins stick out of the boots. Replace cast in base and prepare to ditch. Ditching is just trimming the margin of the area that has to be restored.
It must be recognized that such an arrangement constitutes a team effort. Accordingly, the dentist must provide accurate impressions, registrations, and the information necessary to permit the laboratory technician to develope precise castings.In addition adequate knowledge must exist to permit mutual understanding of procedures and respect for challenges involved. If the pattern was made by indirect method, the casting is carefully test fitted on the die. After the test fitting on the die, the casting is burnished, finished, polished, cleaned thoroughly, and returned to the dentist, who comppletes the final marginal adaption of the casting on the natural teeth. The results is optimum treatment for the patient, and a better looking mouth.