Reliability seems like a very difficult item to judge. Digital X-Ray companies do not fall under the same systems that govern auto parts or other industrial items where the failure rate is known to a very good accuracy. After much research I found no way to actually determine how often a sensor needs repair or any statistics offered by the manufacturer. Furthermore, even if we had good statistical data on number of failures vs number of sensors in the market that in and of itself would not necessarily be a measure of the sensors inherent reliability, but would be impacted by the use of the sensor itself by the client.
There are many ways a sensors life can be shortened by the owner of the sensor. Using a sensor without a holder will often result in the sensor being bitten or the cable being bitten, which is a very fragile part of the sensor.
Secondly, use of the sensor without a proper barrier shield will lead to excessive moisture getting inside the sensor housing and potentially corroding or shorting out its internal components not to mention the corrosive nature of saliva itself to break down the plastic that the sensor is made out of. The most common information provided to doctors about most dental products is hearsay or through anecdotal evidence. Since, all dentists are part scientist by the very nature of their profession they know that there are no facts in hearsay and that it is a very unreliable method for determining even a version of the truth.
As for anecdotal evidence it can be very beneficial if there is enough anecdotal evidence provided in a manner where the source can be distinguished that you can map a trend.
The problem with anecdotal evidence in a small industry, such as dental, is that there is never enough of it to properly map trends and to overcome the idea that people are far more likely to take the time to relay information about a product that dissatisfies them then to relay information about a good experience and even less likely to say something about an experience that was just mediocre or okay.
This can greatly skew the evidence. Also, it is often found that products which are seen as luxury or superior to other products and that caused the user to pay a higher cost are less likely to elicit the owner to speak poorly of the product. For example Lamborghini owners are rarely heard complaining of how often they suffer break downs or problems with their vehicles because they paid so much for them that saying anything negative about them can feel as if they are making themselves appear ignorant in their purchasing decisions.
This same rule applies to very popular items where users feel like the problems are either a rarity that they had the misfortune of suffering or even that the user themselves were at fault. This can often happen when making large purchasing decisions because the buyer feels deeply invested in their decision to purchase. These ideas all lead me down a road of confusion as to how I was going to pursue measuring the reliability of these products.
I will lay out my methods here and hope that I can come to some method of giving useful information on the sensors. With anecdotal evidence, hearsay, and statistical analysis unavailable I pursued the topic in this manner. First, I assume that the warranty of a product and the cost and coverage of that warranty displays the manufacturers belief in the reliability of their product. If the warranty is very short or if their is only a warranty when associated to a high price then I will use that information to draw conclusions as to the manufacturers believe in their own product.
Secondly, there is very little actual technical data available for sensors such as wiring diagrams and component disclosure, but their are things that we can see and draw conclusions from the actual physical makeup of the sensor.
Finally, there is my unfiltered opinion. So I am going to give the warranty life of the product at 2 years. When the connecting cable thickness is taken into consideration, the thinnest was the ProSensor at The total active area of the sensor represents the image size the practitioner will obtain when using a digital sensor.
Corners beveling may lead to reduction of the active imaging area Figure 2. The highest surface area loss around the corners due to beveling was noted for the Platinum and the GXS sensors with loss of The highest loss was recorded for the GXS sensor, at It should be noted that these numbers should be looked at as part of the total active imaging area of a sensor when comparing different sensors.
For size 2 sensors, the largest imaging area measured was mm 2 for the CDR Elite sensor, whereas the smallest was mm 2 for Platinum one should keep in mind that Platinum comes in a single size.
These measurements account for imaging area lost at the corners of the sensor due to beveling. For size 1 sensors, the largest imaging area was mm 2 for the ProSensor, while the smallest area measured was mm 2 for GXS For size 0 sensors, the largest imaging area was mm 2 for the ProSensor and the lowest was mm 2 for RVG As a reference, the active imaging area for the size 2 Kodak Ultraspeed film is mm 2, for size 1 it is mm 2, and for size 0 it is mm 2.
The surface utilization ratio was computed by dividing the total active imaging area by the total gross area of the sensors. Table 1 shows that most size 2 sensors have a utilization ratio between For size 1 sensors, the highest utilization ratio was For size 0 sensors, the range was between The active area of an F-Speed size 2 film has dimensions of All size 2 digital sensors have much smaller active area in comparison. Dividing the dimensions of the active area of a sensor by the active area of a film gives an estimate on how much smaller the image provided by the sensor is in percentage terms; the larger the percentage the better, because more information can be recorded.
The largest imaging area compared to the F-Speed film for size 2 sensors was For size 1 sensors, the largest ratio was For size 0, the largest ratio was Most sensors connect to the computer via a USB Universal Serial Bus interface either directly or via an interface box.
The RVG has the interface box integrated in the cable. In this paper, all sensors were plugged into a USB 2 port. All sensors displayed the radiographs on the monitor screen within 2 to 3 seconds after exposure. Digital x-ray technology provides a significant improvement in dental imaging.
Moreover, it has become clear that there are differences between different sensors available in the marketplace. These differences are discussed below:. Similar to traditional films, sensors are manufactured in different sizes to accommodate different areas of the mouth.
Most companies have size 1 sensors in addition to the larger size 2. Few also offer size 0 sensors Carestream Dental, Schick, and Planmeca. Dexis is the only company that has a single size sensor that is supposed to provide a solution for situations covered by other companies with a size 1 and size 2. Wired CMOS sensors are connected to the computer via a cable. There is no published literature to confirm that this indeed is the number one reason for failure.
The CDR Elite sensor is the only sensor that provides a cable that can be easily replaced. The connection between the cable and the sensor is proprietary and has two screws at the back of the sensor that can be removed to allow installation of a new cable.
Damage to a wire inside the cable would lead to malfunction or render the sensor inoperable until the cable is replaced. In addition, a fewer number of wires have the potential to allow thicker and more durable protective sheets without affecting the overall thickness of the cable; the ProSensor has only two wires in the cable and therefore it is not surprising that it has the thinnest cable diameter.
A fewer number of wires could also increase the durability of the sensor since there is less chance that one of the wires would be damaged. The back-scattering shield is a piece of thin metal placed at the back of the sensor behind the sensor chip.
Its main function is to reduce back-scattered radiation from reaching the imaging CMOS in the same way that the thin lead foil behind a conventional film acts to avoid fogging. It should be noted, however, that back-scattering shields are not standardized and it seems that there is a range of effectiveness.
What you can usually be sure of, however, is there is more to consider when comparing sensors than the mere number of line pairs sensor manufacturers love to talk about. Also, the sensor offers greater image quality and consistency across both high and low radiation dose, while post-capture images can be displayed at ultra-large sizes. It features 3D planning and treatment tools for implants and restorations, oral and maxillofacial surgery, orthodontics, and TMD and airway disorders.
ProMax 3D imaging unit. The ProMax 3D imaging unit features a broad range of imaging views that make it well-suited for diagnosis, planning and treatments including oral surgery, orthodontics and implants. Its three imaging planes make it easier to locate and trace the mandibular nerve canal, providing the dentist with more confidence when planning dental implants. The image a sensor produces is an important factor in deciding which sensor to purchase.
On the contrary, cone beam systems are a valuable asset to general dentists in all disciplines: teeth crowding and eruption for orthodontics; canals, morphology, underobturated canals and fractured roots in endodontics; periodontal defects for possible grafting, in addition to nerve location for impacted extractions or implant placements.
Like all expensive equipment, practitioners must define what they want it to do and how it will provide what they need. Digital photography offers significant value to general practice beyond showing professional-looking before and after photos of a successful esthetic transformation. Merely showing patients a transformation is just the tip of the iceberg with respect to digital photography. The advice and support of professionals is required when properly running any business that depends on computers.
Doing it improperly wastes more money every month than the cost of the computers themselves, while properly maintained and smoothly running systems provide a solid ROI and give your practice a cutting-edge image.
Informing before performing is a must for all treatments, not excepting the digital X-ray process. Simply put, a small investment lets your old information move into the future along with the rest of your practice. Backed by the proven reliability of thousands of installations, EVA offers a durable sensor coupled with the highest standard of technology.
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Contact a digital X-ray systems specialist today to learn more about a seamless, cost-effective and worry-free transition to a fully digital practice. Curious about an all-inclusive digital X-ray equipment upgrade?
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