Here the occlusal plane should be mildly curved upward to make a smile-like line. Optimum density 2. Chemical Reduction of Radiographs An over exposed or over developed film will be too dark for convenient viewing , owing to excessive deposit of silver which obscures the image details . Zone 1: The dentition. It is usually easy to identify incorrect film exposure. Slight underfixing causes the radiograph to yellow over time. Covers the area of interest completely When any of the above conditions are not satisfied it may be termed as the faulty radiographs. This might be partially because overexposure can be somewhat compensated by examining the radiograph with a bright light. Lung zones. reason for too dark (overexposed) or light (underexposed) radiographs (Figures 3. and . THE IDEAL RADIOGRAPH IS THE ONE WHICH SHOWS: 1. Such faulty radiograph requires a retake of the radiograph which causes unnecessary exposure to the patient and waste of precious time. Before a developing lesion will show up as a dark spot on a radiograph, the bone in the affected area must have finally reached a point where at minimum around 7% of its mineral content has been lost, and possibly as much as 30 to 50%, depending on the type of bone (cancellous vs. more dense cortical bone) that exists in the affected area. Overexposed or overdeveloped film results in a dark radiograph. The roots of the anterior teeth are in the image, and the posterior teeth are the same size on each side with no more overlapping of the contacts on one side than the other. Hence, a simple method is required which could salvage a dark radiograph. Optimum contrast 3. All models allow the adjustment of time (or pulses), while the ability to adjust kVp and mA varies from model to model. The variation in incident exposure in each column corresponds to a range from one-half up to five times the exposure of a typical "200 speed" screen-film detector. Other dense structures include calcium, barium and iodine, all of which look white on radiographs. 4). Despite this, there is a tendency towards overexposed radiographs. Porosity is the result of gas entrapment in the solidifying metal. Extreme underfixing causes the film to blacken before viewing. Either your x-rays are coming out to light or to dark. Assess the lungs by comparing the upper, middle and lower lung zones on the left and right. What does a radiograph with the proper amount of density look like? Underfixing. -it provides visualization of all the structures of interest and not be too dark or too light The more x-rays that strike the film the ____ the radiograph, therefore _____ is dependent on the number of x-rays reaching the film The number one reason for poor radiographs…Exposure. Accurate 4. Note the scissors are brighter white in areas where the metal is thicker, like the handles. Dark radiographs are most commonly encountered faults in dental radiography which renders the radiograph useless. The arc does not melt the base metal sufficiently and causes the slightly molten puddle to flow into the base material without bonding. Decreasing the exposure time usually solves the problem, but occasionally decreasing the development time may be preferred. Asymmetry of lung density is represented as either abnormal whiteness (increased density), or abnormal blackness (decreased density). Barium and iodine will … The radiograph shown is a pair of metal scissors, which are radioopaque. Digital radiography phantom images acquired with screen-film (top row), computed radiography (middle row), and an extracted and magnified insert from the digital images (bottom row). This can be due to a numerous amount of reasons most of which are listed below. A dark radiograph or abnormal blackness ( decreased density ) termed as the faulty radiographs which listed... 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