Show-through of Tray

Tooth or tissue contact with impression tray +

Use stock trays with correct size or custom trays. If necessary, apply facial/oral, occlusal or dorsal stops.

Too much pressure applied upon seating of the tray +

Apply controlled pressure upon seating the tray and hold it in place without exerting additional pressure to avoid contact between teeth/tissue and bottom of tray. Maxillary impression: Place index and middle fingers in the premolar area for stability. Never hold impression by the handle. Bring arms to your side to give more support. Mandibular impression: Always line up tray handle to the patient’s midline. Hold tray with thumbs and take fingers under the patient’s chin to stabilize the impression. Remember impression materials are spongy and can lift if not stabilized.

Lack of support of the tray by operator during the initial phase of polymerization +

Support tray until impression material is sufficiently set. Stabilize the tray after seating, avoid any movements. When taking an impression of the upper jaw, you can easily find support on the chin or cheek bone of the patient. With impressions of the lower jaw it is recommended to support the tray on the mandibula. Patients should close their mouth as much as possible without biting down on the tray to avoid I30deformation of the mandibula and, thus, errors in the impression. Do not try to correct the position of the tray after insertion.

Insufficient amount of impression material used +

Do not underfill the tray. Use sufficient material to create a back flow effect. If required, block out the palatal area of the tray.