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1 Custom Trays DA122 Dental Materials. 2 Why would one use a custom tray? Patient’s mouth needs major adaptations –Dimensions or anatomy will not allow.

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Presentation on theme: "1 Custom Trays DA122 Dental Materials. 2 Why would one use a custom tray? Patient’s mouth needs major adaptations –Dimensions or anatomy will not allow."— Presentation transcript:

1 1 Custom Trays DA122 Dental Materials

2 2 Why would one use a custom tray? Patient’s mouth needs major adaptations –Dimensions or anatomy will not allow use of stock tray –custom tray be made to aid in impressing process Main reason for a custom tray is to get an ultra-accurate impression for a denture or a partial Patient’s mouth needs major adaptations –Dimensions or anatomy will not allow use of stock tray –custom tray be made to aid in impressing process Main reason for a custom tray is to get an ultra-accurate impression for a denture or a partial

3 3 How can custom trays be constructed? Acrylic: –Consists of a two part system that self cures Light Cure Resin: –A sheet of resin material is placed over the model and light cured to set. – It is then trimmed to the dimensions of the patients mouth Vacuum-formed custom trays: –A sheet of acrylic resin is placed in a vacuum former and is dropped on top of the model; trimming will need to be done following the cool down process Thermoplastic tray material: –Rounded beads are warmed in water and then can be pliable enough to form into a tray around the dentition. The material sets upon cooling Acrylic: –Consists of a two part system that self cures Light Cure Resin: –A sheet of resin material is placed over the model and light cured to set. – It is then trimmed to the dimensions of the patients mouth Vacuum-formed custom trays: –A sheet of acrylic resin is placed in a vacuum former and is dropped on top of the model; trimming will need to be done following the cool down process Thermoplastic tray material: –Rounded beads are warmed in water and then can be pliable enough to form into a tray around the dentition. The material sets upon cooling

4 4 Steps of Construction: Using an edentulous arch, take a pencil and outline the arch form into the mucco-gingival fold. (where attached gingiva and free gingiva meet) –Be sure to outline around specific muscle attachments. They will be captured in the impression, but we must not adapt their position due to the tray Use foil to form around the model, or use a liquid foil separator –This will act as a barrier between the model and the wax, to ensure that the wax will not stick Using an edentulous arch, take a pencil and outline the arch form into the mucco-gingival fold. (where attached gingiva and free gingiva meet) –Be sure to outline around specific muscle attachments. They will be captured in the impression, but we must not adapt their position due to the tray Use foil to form around the model, or use a liquid foil separator –This will act as a barrier between the model and the wax, to ensure that the wax will not stick

5 5 Marking your model

6 6 Steps of construction: Use a warm sheet of pink baseplate wax to form over the foil sheet (sometimes two maybe necessary) –This sheet allows enough room in the tray for impression material to flow easily Use a warm wax spatula to trim excess around the model, using your pencil line as a gauge Place a layer of liquid separator (or foil) on top of the wax. –This will prevent the sticking of the warm wax to the custom tray material Use a warm sheet of pink baseplate wax to form over the foil sheet (sometimes two maybe necessary) –This sheet allows enough room in the tray for impression material to flow easily Use a warm wax spatula to trim excess around the model, using your pencil line as a gauge Place a layer of liquid separator (or foil) on top of the wax. –This will prevent the sticking of the warm wax to the custom tray material

7 7 Material formed over model

8 8 Steps of construction Form custom tray material over the wax. Trim with a lab knife to edge of wax, use excess to form a handle that extends from midline to outside of the oral cavity Allow material to set according what was used (we use the oven) Trim and polish finished tray It is now ready for use! Form custom tray material over the wax. Trim with a lab knife to edge of wax, use excess to form a handle that extends from midline to outside of the oral cavity Allow material to set according what was used (we use the oven) Trim and polish finished tray It is now ready for use!

9 9 Light Cure and Finished Product


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