In general, if you have a question on accuracy of which one to use, the use of an open tray impression coping will typically be more accurate. However, if the implants are malaligned it is advisable to use open tray impression copings since the misalignment of the implants may lock the impression in the mouth if closed tray impression copings are used because of their lack of draw. If you have multiple implants but plan on restoring them as single-units, you may choose to use closed tray impression copings for ease of use. with resin) can improve the accuracy as well. It has also been shown that splinting the impression copings in the mouth (ie. However, if you have multiple implants that will be splinted in either partially or fully edentulous patients, open tray impression copings will be more accurate. In general, for single-unit partially edentulous patients, closed tray and open tray impression copings can be used interchangeably. A recent systematic review of the literature by Papaspyridakos et al, can help shed some light on the use of the different implant copings. If you have ever locked an impression in the mouth, you know exactly what I mean! It is for this reason that many clinicians would rather use closed tray impression copings.Ĭan these different types of impression copings be used interchangeably? The answer depends on the clinical situation. If you are like most clinicians, using an open tray impression coping may bring a little bit of anxiety with it since you must make sure you can find and access the impression coping screw in order to remove the impression. Impression copings for implant prosthetics generally come in two distinctly different types: closed tray or open tray.
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