‘V’ shaped notches were made at the horizontal land of the cast to facilitate proper orientation of the custom made acrylic tray while making impression each time. This modified stone cast was then viewed under travelling microscope for clarity of vision of selected points for ease of recording of distance between these selected points. Markings were done on mesiobuccal cusp tip of right first molar, cusp tip of right canine, mesioincisal angle of left central incisor, buccal cusp tip of first left premolar, distobuccal cusp tip of left second molar.
Standard maxillary dentulous stone cast was used.
analuminium die was specially prepared for this study. Nickel-Chromium plated Aluminium (metal) die, custom made perforated acrylic impression tray, metal stand with handle and platform, custom made acrylic Box frame for pouring cast. Travelling microscope (INCO, Ambala, Haryana India). A custom made apparatus was designed to maintain standardization and ease for impression making. Instruments & Equipments used in this study were Vernier calliper, Alginator (Algimax-II Holy medical Ltd), Humidor, Electrical balance (Aiwa, India Ltd), Vaccum mixer (Cuumyx confident), Room heater (Lazer quality appliances, India), Custom made Nickel-Chromium plated Aluminium die, perforated acrylic impression tray, acrylic Box frame for pouring cast. Maharashtra, India during 2009-2010 to evaluate dimensional accuracy of irreversible hydrocolloid (alginate) impression material by pouring impressions with variations in time of pouring and temperature.Ī-Velplast (Keller laboratories), B-Marieflex (Dentsply Ltd.), C-Zelgan (Dental Product of India), Gypsum Type IV die material Kalrock (Kalabhai manufacturers, Mumbai) & Heat cure acrylic resin (Dental Product Of India Ltd) were used in the study. The study was designed and conducted in the Department of Prosthodontics, Crown and Bridge Sharad Pawar Dental College, Wardha. Because of these facts, the present study was planned to evaluate the dimensional accuracy of different brands of Alginate impressions available in Indian market and provide insights for best possible time of pour to prevent distortion of commercially available impression materials. However, it begins to distort with the storage time for more than ten minutes and it cannot be used for clinical procedure like crown and bridge preparation after one to three hours. Alginate is used as a major dental impression material worldwide in many clinical procedures. Thus, considerable delay is caused in pouring the model, after removal of the impression from the mouth which is one of the reasons for causing dimensional changes in the impression, there by threatening the dimensional accuracy of the prosthesis. Because of time constraint pouring of impression by dentists themselves is on decline, as they prefer to send impressions to dental laboratories for making cast. Obtaining an accurate cast of a dental arch is an important step in the success of various dental treatments. They are there to help you feel comfortable.Fabrication of successful and accurate prosthesis requires judicious application of experience and knowledge of dental materials. If you are worried about an active gag reflex, talk to your dentist. Precise impressions help dentists make custom fitting appliances that won't cause irritation or discomfort. Getting impressions of your teeth is an important part of restorative and orthodontic treatments. They may administer nitrous oxide, laughing gas, to stop the reflex and make you feel relaxed. Let your dentist know if you experience a gag reflex.
The tray will be firmly placed on the upper or lower teeth (depending on where the dental work is being done) for a couple of minutes. The mixture is then spooned onto a u-shaped impression tray that will fit onto the arch of your teeth.
Once this is done, they will mix the alginate powder with water to create a smooth, spreadable consistency. Your dentist will start by cleaning the teeth to remove any debris and allow the mouth to partially dry. Making dental impressions happens during your initial consultations.
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