If adequate resistance form and fit of the prosthesis are provided, the chance for functional stability equivalent to natural teeth is good. Once the FPD is fabricated and completely seated, it is ensured full engagement of the entire circumference of and occlusal support from the abutment retainers. Accomplishment of parallel preparations is ultimately verified by complete seating of the prosthesis, but could be verified on the master cast or dies by the use of the surveyor. When a fixed partial denture (FPD) is prepared, the orientation of the diamond bur is controlled to remove an amount of tooth structure necessary to satisfy the requirements of the path of insertion for the prosthesis. Have students identify each of the human-made features below and its symbol.Įncourage students to use what they learned about symbols to identify natural features and their symbols too.Paralleled Blockout, Shaped Blockout, Arbitrary Blockout, and Relief Then ask students to use those symbols to identify other human-made features on the contour map of your area. Use symbols to identify other features on the contour map of your area.ĭisplay the USGS Topographic Map Symbols PDF for students. Have them subtract the lowest number from the highest to figure out the height of that landform.Ĥ. Have students read the contour lines at the bottom and top of the highest place in your area. If the local relief is relatively flat, emphasize variation rather than extremes between steep and flat. Explain that the space indicates the elevation is not changing much those are flat places. Then have students pinpoint a place where the contour lines are far apart. Explain that the close lines mean the elevation is changing rapidly those are steep places. Have students pinpoint a place where the contour lines are close together. Tell students that by reading contour lines, they can measure the steepness of a hill, the height of a mountain, and even the depth of a lake or ocean. Explain to students that these are imaginary lines that join points of equal elevation, and that they allow you to read the shape of the Earth’s surface. Use the Nat Geo Topo! Explorer website to find and display a contour map of your area. Sources: who provided information for the map Index: the part of the grid where specific information can be located Orientation: direction (north arrow or compass rose) Write the acronym on the board and explain to students that most topographic maps include these map essentials: Ask students if they have ever heard the acronym DOGSTAILS. Remind students that an acronym is a word formed from the first letters of other words. Ask: Why might this be useful? Elicit from students that contour maps are a convenient way to visualize flat and steep terrain, especially for hikers or other people navigating with maps. Explain to students that relief is the amount of elevation change in the land surface within a given area.Įxplain to students that a contour map is another name for a topographic map, or a map that shows the elevation of land on a flat paper surface. In the flatter areas, elevation doesn’t change as much. Tell students that in hilly and mountainous areas, the elevation of the land changes within the area-sometimes very quickly. Explain to students that those differences are elevation changes. Ask: What is the main difference between hilly or mountainous terrain and flat terrain? Students should point out the differences in height. Sketch simple line drawings of each on the board. Brainstorm a list of common landforms.Īsk students to name some common landforms, such as hills, mountains, valleys, and plateaus.
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