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Lab talk, the good, the bad, and the ugly
Dental-CAD
Identica Blue VS Degree of Freedom Scanners?
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<blockquote data-quote="Glenn Kennedy" data-source="post: 237377" data-attributes="member: 6563"><p>Every mechanism has its advantages and disadvantages. The mechanism illustrated in the video touts the benefit of fixture free scanning. The object to be scanned is stationary and the scan module moves in an arc over the object to scan it. The downside of this design is the limited range of motion. If the object is small and has undercuts (an abutment for example ) then the scanner will not be able to capture data because it can't rotate under the scan target. To compensate for this missing data the scan software will fill in the missing geometry with a best guess based on the surrounding geometry. The result is data that is not accurate in critical areas like the margin of the abutment.</p><p></p><p>Gru, in your illustration above you took liberties with the range of movement. The axis of rotation does not move as shown in your illustration. The range of motion is controlled by the gear and the center of rotation. I am not trying to bash but I am pointing out that each design has strengths and weaknesses. If you have the product and it fits your needs then all is well. If someone is shopping for a scanner then they should know the advantages and disadvantages of the design.</p><p>[ATTACH=full]24334[/ATTACH] </p><p>[ATTACH=full]24335[/ATTACH] </p><p>[ATTACH=full]24336[/ATTACH]</p></blockquote><p></p>
[QUOTE="Glenn Kennedy, post: 237377, member: 6563"] Every mechanism has its advantages and disadvantages. The mechanism illustrated in the video touts the benefit of fixture free scanning. The object to be scanned is stationary and the scan module moves in an arc over the object to scan it. The downside of this design is the limited range of motion. If the object is small and has undercuts (an abutment for example ) then the scanner will not be able to capture data because it can't rotate under the scan target. To compensate for this missing data the scan software will fill in the missing geometry with a best guess based on the surrounding geometry. The result is data that is not accurate in critical areas like the margin of the abutment. Gru, in your illustration above you took liberties with the range of movement. The axis of rotation does not move as shown in your illustration. The range of motion is controlled by the gear and the center of rotation. I am not trying to bash but I am pointing out that each design has strengths and weaknesses. If you have the product and it fits your needs then all is well. If someone is shopping for a scanner then they should know the advantages and disadvantages of the design. [ATTACH=full]24334[/ATTACH] [ATTACH=full]24335[/ATTACH] [ATTACH=full]24336[/ATTACH] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
Identica Blue VS Degree of Freedom Scanners?
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