Drill Offset, Surveying and Support Margins

Watch the short video and learn how this works.

Sometimes the tooth preparation can have sharp & pointy edges which may be unaccessible to the smallest CNC machine drill bit. These areas will need to be blocked-out. We refer to this as the Drill Offset. The Drill Offset will be included in the surveying procedure which follows. This will then allow the machining tool to access the thin area. Support Margins are then added. These margins are available in three different sizes, but you can increase or decrease these as well. The support margins ensure that the edges of the copings are not too thin and prevent them from breaking.

Drill Offset, Surveying and Support Margins

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Drill Offset, Surveying and Support Margins

Select the Surface, then enter into the Drill Compensation submenu. This first section of the menu can be randomly used to check any tooth preparation for thin areas, which may be inaccessible to a small CNC machine drill bit. This check should be routinely done while working in this module. For example, if your smallest drill bit is 1mm, add a small amount to this, make this 1.1mm We will then run a check for thin areas on the tooth preparation which are less than 1.1mm in width.

If no red areas show up, just use the 'Exit if No Thin Areas' button. If you see red areas on the surface this means that a 1mm drill bit will not be able to access into the area. Hold down the left mouse button and paint over the area to block these out. Likewise, if there are any other areas you want to block out on the tooth preparation then block those out as well.

Drill Offset, Surveying and Support Margins

If no red areas show up, just use the 'Exit if No Thin Areas' button. If you see red areas on the surface this means that a 1mm drill bit will not be able to access into the area. Hold down the left mouse button and paint over the area to block these out. Likewise, if there are any other areas you want to block out on the tooth preparation then block those out as well.

Drill Offset, Surveying and Support Margins

Select the surfaces next, and enter into Survey submenu. When working with upper teeth press the Survey Upper Surfaces tab. When working with lower teeth use the 'Survey Lower Surfaces' tab. Place the mouse pointer into the survey widget, then survey the case. Following this, press the BlockOut Upper or the BlockOut Lower button, depending on whether you are working with upper or lower teeth. Blue abutments will appear.

Drill Offset, Surveying and Support Margins

Enter into the Contact and Margins submenu. Then select one or multiple blue abutments and use the 'Add Support Margins' button. There are three options for margin width, although the plus and minus button can be used to further customise the width of the margin. The structure for the drill offset will be hidden temporarily.

Drill Offset, Surveying and Support Margins

Drill Offset, Surveying and Support Margins