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Dental Radiography

by: Courtney Johnston

Dental Radiography DEA 125

Courtney Johnston

GPA 3.98


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Class Notes
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This 4 page Class Notes was uploaded by Courtney Johnston on Monday October 12, 2015. The Class Notes belongs to DEA 125 at Front Range Community College taught by Staff in Fall. Since its upload, it has received 44 views. For similar materials see /class/221859/dea-125-front-range-community-college in Dentistry at Front Range Community College.


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Date Created: 10/12/15
DEA 125 DENTAL RADIOLOGY I THE DENTAL FILM OBJECTIVES At the completion of this lesson the student will with at least 70 accuracy on a written and or oral exam 1 2 3 4 5 6 7 I II Discuss the composition of dental lm Describe latent image formation Differentiate between screen and nonscreen lms Identify the contents in dental film packets Identify and compare the various intraoral films according to size customary usage and film speed Differentiate between intraoral and extraoral films Discuss correct methods of film storage and protection Composition of Dental Films A Very similar to those used in photography B Techniques have changed but no the fundamentals C Film Base 1 Purposeito provide support for the fragile emulsion and tp provide strength for handling 2 Tint provides for contrast and image quality D Emulsion l Composed of gelatin in which crystals of silver halide salts are suspended 2 Each layer of emulsion is attached to the base by a thin layer of adhesive 3 The gelatin is used to protect the emulsion from scratching and rough handling 4 The function of the gelatin is to keep the silver halide crystals evenly suspended over the base 5 Sensitive to light radiation heat chemical fumes and bending 6 Minor bending can crack the surface of emulsion E Latent Image 1 The invisible image that is created when the silver halide crystals have been exposed to radiation 2 In order for the image to appear the film must be developed Film packets A 5 intraoral sizes B 3 extraoral sizes C The film packet l Consists of a Film b Black paper wrapping c Lead foil 111 d Cover wrapping Film a May have either one or two lms within the packet b The identi cation dot is found in the comer of the lm to determine right from left Black paper wrappingiused to protect the lm from white light Lead foil a The purpose of the foil backing is to absorb scattered radiation b Decreases lm fogging c Embossed with a pattern that becomes visible on the developed lm in the event that the packet is exposed backwards by mistake Packet a Moist proof made of either moisture resistant paper or soft vinyl plastic b The purpose of the wrapping is to hold the packet contents and to protect the lm from light and moisture c 2 sides to every packet tubehead side and back side d Tube side gt Solid white gt Often times can see the identi cation dot on this side gt This side ofthe lm is placed closest to the lingual surface of the teeth e Back side gt Contains a tab to make it easier to open packet gt Manufacturer s information is found on this side 5 UI Film Speeds A Refers to the amount of radiation required to produce a radiograph of standard density B The faster the speed lm the less radiation required to get a lm of standard density C Factors that determine lm speed 1 Size of silver halide crystal a The larger the crystal the faster the lm speed b The larger the crystal the grainer the lm appearance c The grainer the image the greater the loss of image sharpness 2 Thickness of emulsioniThe thicker the emulsion the faster the lm 3 Special radiosensitive dyes Dyes are added to the emulsion to speed the lm D Speed Groups 1 The names super ulta or ekta tell nothing about the speed of the lm 2 The letter of the lm determines speed of lm 3 A speed lm is the slowest while F speed lm is the fastest 4 Currently D and E speed lm is being used with F speed lm becoming popular 5 ADA recommends using D speed lm or higher on a patient Types of Dental Xray Film A Two basic types 1 Screen lm a Indirect exposure lm b Exposed primarily by a uorescent type of light given off by special emulsion coated intensifying screens c Film is placed in a cassette 2 Nonscreen lm a Direct exposure lm b The radiation comes in direct contact with the lm B Size of lms l The larger the number the larger the lm 2 Films can be used as periapicals bitewings or occulsal lms based on the position of the lm in the mouth 3 Periapical lm is used to make detailed examination of the periodontal membrane and the surrounding tissue along with the entire tooth 4 Bitewing lms are used to examine the crowns of the teeth above the alveolar process Especially valuable when diagnosing caries 5 Occlusal lms a Sometimes referred to as a sandwich lm b Ideal for making a rapid survey of a large area of the maxilla mandible and oor of the mouth c Able to reveal gross pathology and fractures 6 Various sizes of lms a Size Oiusually considered to be pediatric lms b Size lican be used either for anterior exposures or for pediatric lms c Size 2iadult sized lm can be used either for periapicals or for bitewing exposures d Size 3ilong bitewing lm used on adults only e Size occlusal lm used on adults f 5 x 7 used mainly for lateral views of the jaw g 8 x 10 used for pro les and posteroanterior views h 5 x 6 used for panoramic radiographs Duplicating Film A Identical to the original radiograph B Duplicating lm and a duplicator must be used C Reason for duplicating lm 1 Insurance 2 Referral to another dental of ce D How it works 1 Processed radiograph is placed on the duplicating lm 2 Film is exposed to either infrared or ultraviolet light 3 Duplicating lm has emulsion on only one side which makes it appear dull while the other side is shiny 4 Once the lm has been exposed to the duplicating light it is processed like all other lm VI Film Storage and Protection A All lm is extremely sensitive to light heat humidity and pressure B Any of these can cause lm fogging or darkening of the nished radiograph on the lm even prior to exposing or processing C Dark room concerns 1 Old or contaminated solutions Chemical fumes from the processors 3 Pressure 4 Faulty Safe lights 5 UneXposed lm SHOULD NOT be stored in the dark room D Heat and humidity l Ideally should be stored at 50700 2 3050 relative humidity E Pressureido not stack lm to high or place heavy objects on lm F Film should not be left in the same room as where the exposure is being done unless in lead container G All lm has a shelf life oldest lm should be used rst Rotate stock N


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