1 00:00:00,000 --> 00:00:10,833 2 00:00:10,833 --> 00:00:16,933 This Quick Guide tutorial from exocad explains the crown bottom settings in detail. 3 00:00:16,933 --> 00:00:24,066 Important note: This part of the design and the parameters involved are crucial for a proper fitting. 4 00:00:24,066 --> 00:00:31,932 Please always discuss your intentions for adjusting parameters with your provider or milling center's support! 5 00:00:31,933 --> 00:00:33,099 6 00:00:33,100 --> 00:00:39,633 In the 5-axis mode you will notice that the arrows show individual insertion axes for each tooth, 7 00:00:39,633 --> 00:00:45,399 whereas the 3-axis mode enforces a unique insertion axis for bridges. 8 00:00:45,400 --> 00:00:45,666 9 00:00:45,666 --> 00:00:49,999 Note that you will not always be prompted to define the insertion axis. 10 00:00:50,000 --> 00:00:57,900 A red arrow indicates that the insertion axis for this tooth might not be optimally defined and may need your attention. 11 00:00:57,900 --> 00:01:02,900 With a right-mouse click on the tooth you can always verify or change it. 12 00:01:02,900 --> 00:01:03,900 13 00:01:03,900 --> 00:01:10,666 Rotate the view so that you look onto the preparation from the desired insertion direction. 14 00:01:10,666 --> 00:01:14,266 While rotating, undercuts are marked in red. 15 00:01:14,266 --> 00:01:15,899 16 00:01:15,900 --> 00:01:23,000 Then, click "Set current view as insertion axis" to define the view as the new insertion axis. 17 00:01:23,000 --> 00:01:24,333 18 00:01:24,333 --> 00:01:33,166 Once the insertion axis has been applied, the depth of the undercuts will be displayed corresponding to the color scale. 19 00:01:33,166 --> 00:01:37,566 20 00:01:37,566 --> 00:01:41,132 Use the drop-down menu to switch to another tooth 21 00:01:41,133 --> 00:01:41,166 22 00:01:41,166 --> 00:01:43,399 and correct it's insertion axis. 23 00:01:43,400 --> 00:01:47,500 24 00:01:47,500 --> 00:01:55,766 In the tooth bow, you can select a series of teeth with a click to define a unique insertion axis for those. 25 00:01:55,766 --> 00:01:57,332 26 00:01:57,333 --> 00:02:04,266 Click "Set current view as insertion axis" to define a unique insertion axis for the selected teeth 27 00:02:04,266 --> 00:02:04,466 28 00:02:04,466 --> 00:02:12,566 or check "Unique insertion direction for bridges" to choose a unique insertion axis for all connected crowns. 29 00:02:12,566 --> 00:02:24,299 Note that the software will automatically enforce parallel insertion axes for bridges if a material configuration for 3-axis/4-axis milling is used. 30 00:02:24,300 --> 00:02:24,533 31 00:02:24,533 --> 00:02:27,866 Now let's choose a unique insertion axis for the bridge 32 00:02:27,866 --> 00:02:32,399 and click the "OK" button to apply the changes to the crown bottoms. 33 00:02:32,400 --> 00:02:35,300 34 00:02:35,300 --> 00:02:40,700 The red zones on the margin indicate areas which might create undercuts. 35 00:02:40,700 --> 00:02:47,000 This behavior can be changed in the "Undercuts" tab. It will be explained later in this video. 36 00:02:47,000 --> 00:02:47,633 37 00:02:47,633 --> 00:02:53,399 Let's choose a custom view for tooth 16 to show the main cement gap parameters. 38 00:02:53,400 --> 00:02:53,800 39 00:02:53,800 --> 00:02:56,966 The yellow area is the cement gap zone. 40 00:02:56,966 --> 00:03:00,399 It can be adjusted with the cement gap slider. 41 00:03:00,400 --> 00:03:05,166 And as you can see now, the new cement gap is computed in real time. 42 00:03:05,166 --> 00:03:09,132 43 00:03:09,133 --> 00:03:14,266 The green zones on the dies and in the wizard indicate areas where is no gap. 44 00:03:14,266 --> 00:03:15,366 45 00:03:15,366 --> 00:03:21,266 The distance from the margin without cement gap can be adjusted with the slider "From margin" 46 00:03:21,266 --> 00:03:23,399 or by typing in a value. 47 00:03:23,400 --> 00:03:27,266 48 00:03:27,266 --> 00:03:31,199 Furthermore both zones can be defined with a brush. 49 00:03:31,200 --> 00:03:37,000 Click on the brush button for the zone you want to adjust. 50 00:03:37,000 --> 00:03:40,500 Let's try it with the "No cement gap" zone. 51 00:03:40,500 --> 00:03:44,400 52 00:03:44,400 --> 00:03:48,933 With Shift and the mouse wheel you can change the brush size. 53 00:03:48,933 --> 00:03:51,599 54 00:03:51,600 --> 00:03:57,933 Extending the green zone without cement gap in the margin area will certainly increase the friction. 55 00:03:57,933 --> 00:04:04,466 56 00:04:04,466 --> 00:04:07,799 Use Shift to inverse the brush interactively. 57 00:04:07,800 --> 00:04:08,600 58 00:04:08,600 --> 00:04:12,100 This allows you to delete brushed parts very easily. 59 00:04:12,100 --> 00:04:14,700 60 00:04:14,700 --> 00:04:17,566 Click on the brush button of the other zone 61 00:04:17,566 --> 00:04:17,599 62 00:04:17,600 --> 00:04:19,966 to brush and adjust the yellow area. 63 00:04:19,966 --> 00:04:25,132 64 00:04:25,133 --> 00:04:29,466 Use again Shift to inverse the brush interactively. 65 00:04:29,466 --> 00:04:37,932 66 00:04:37,933 --> 00:04:41,433 It is also possible to add an additional zone 67 00:04:41,433 --> 00:04:44,466 68 00:04:44,466 --> 00:04:49,132 and to choose an individual cement gap for this separate area. 69 00:04:49,133 --> 00:04:54,599 This function could be used to increase the block- out thickness on sharp edges. 70 00:04:54,600 --> 00:05:08,300 71 00:05:08,300 --> 00:05:12,333 Also here, you can use Shift to delete brushed zones. 72 00:05:12,333 --> 00:05:14,566 73 00:05:14,566 --> 00:05:17,332 You can also reset all markings. 74 00:05:17,333 --> 00:05:22,966 75 00:05:22,966 --> 00:05:30,966 Some people might want to use the additional zone as a cement gap end with no spacing to avoid the rocking of big bridges. 76 00:05:30,966 --> 00:05:40,599 77 00:05:40,600 --> 00:05:49,333 Maybe you already noticed that if you reset all markings, the distance sliders for each zone become active again. 78 00:05:49,333 --> 00:05:52,499 79 00:05:52,500 --> 00:05:57,133 Now you can even define a distance for the blue area from the top. 80 00:05:57,133 --> 00:05:58,866 81 00:05:58,866 --> 00:06:02,932 You can again adjust the cement gap thickness in this zone. 82 00:06:02,933 --> 00:06:17,066 83 00:06:17,066 --> 00:06:22,632 The blue cement gap zone will disappear if you choose 0 as a distance. 84 00:06:22,633 --> 00:06:32,699 85 00:06:32,700 --> 00:06:42,366 "Additional Spacing" allows you to add additional offset (spacing) to the entire crown bottom, independent of the cement gap. 86 00:06:42,366 --> 00:06:48,666 This means that the cement gap will be applied on top of the additional spacing. 87 00:06:48,666 --> 00:06:50,132 88 00:06:50,133 --> 00:06:54,466 The "Axial" spacing will add offset in occlusal direction. 89 00:06:54,466 --> 00:07:01,099 The "Radial" spacing will add offset perpendicular to the occlusal direction. 90 00:07:01,100 --> 00:07:06,933 Both sliders are locked so that offsets are added equally spaced to the 3 axes. 91 00:07:06,933 --> 00:07:10,499 92 00:07:10,500 --> 00:07:14,466 The higher values are here, the looser the fitting. 93 00:07:14,466 --> 00:07:19,899 94 00:07:19,900 --> 00:07:26,600 Setting this parameter to 0 means that the green area and the margin will have no gap. 95 00:07:26,600 --> 00:07:29,466 96 00:07:29,466 --> 00:07:35,299 Some people might want to use the parameters to create a thin gap in the green area. 97 00:07:35,300 --> 00:07:41,766 But it is important to know that these values will be applied in addition to the cement gap. 98 00:07:41,766 --> 00:07:49,199 In this case, this would result in a real cement gap in the yellow area of 0.11 mm. 99 00:07:49,200 --> 00:07:49,900 100 00:07:49,900 --> 00:07:56,533 It is recommended to keep both sliders locked to ensure equal space in all axes. 101 00:07:56,533 --> 00:08:02,533 Nonetheless you can unlock the sliders and set individual parameters for each. 102 00:08:02,533 --> 00:08:18,499 103 00:08:18,500 --> 00:08:23,533 You can also use negative values to create a tighter fitting. 104 00:08:23,533 --> 00:08:28,033 The result would be a crown that has a smaller bottom than the die. 105 00:08:28,033 --> 00:08:32,733 Note that negative settings may lead to manual work on the restoration. 106 00:08:32,733 --> 00:08:34,866 107 00:08:34,866 --> 00:08:42,632 However, trying to improve the fitting by changing the "Additional Spacing" values is a workaround, not a solution. 108 00:08:42,633 --> 00:08:49,899 A properly tuned CAM system should be able to achieve good fittings with minimal additional spacing. 109 00:08:49,900 --> 00:08:53,300 110 00:08:53,300 --> 00:08:56,566 Let's have a look at the border settings. 111 00:08:56,566 --> 00:09:06,432 112 00:09:06,433 --> 00:09:13,266 I have prepared a sectional view which will help us to understand how the border shape can be influenced. 113 00:09:13,266 --> 00:09:20,399 114 00:09:20,400 --> 00:09:24,833 The graphic illustrates the meaning of the sliders. 115 00:09:24,833 --> 00:09:25,833 116 00:09:25,833 --> 00:09:34,133 "Horizontal" defines the horizontal crown border width. Typically, material properties enforce certain limits here. 117 00:09:34,133 --> 00:09:40,366 E.g. for Zirconia, the common minimum value is 0.2 mm. 118 00:09:40,366 --> 00:09:41,299 119 00:09:41,300 --> 00:09:49,333 "Angled" defines the length of the border's angled part. This is commonly set to 0 for metal. 120 00:09:49,333 --> 00:09:53,966 121 00:09:53,966 --> 00:09:57,966 "Angle" defines the angle for the angled part. 122 00:09:57,966 --> 00:10:10,566 123 00:10:10,566 --> 00:10:16,632 "Vertical" defines an additional vertical border. Commonly this value is also set to 0. 124 00:10:16,633 --> 00:10:22,133 125 00:10:22,133 --> 00:10:29,966 "Below margin" defines an absolute offset for all the drawn margin points in the insertion direction. 126 00:10:29,966 --> 00:10:39,499 127 00:10:39,500 --> 00:10:48,466 The third tab in the "Crown Bottoms" dialog provides undercut-related options and milling parameters. 128 00:10:48,466 --> 00:10:54,899 129 00:10:54,900 --> 00:11:00,966 Another sectional view will help us to understand the undercut and milling parameters. 130 00:11:00,966 --> 00:11:03,332 131 00:11:03,333 --> 00:11:10,633 Per default, undercuts are blocked out in the preparation unless you check "Don't block out undercuts". 132 00:11:14,633 --> 00:11:19,366 Note: Changes in the undercut settings always have to be applied. 133 00:11:19,366 --> 00:11:25,332 134 00:11:25,333 --> 00:11:28,999 Now you see that undercuts are not blocked out. 135 00:11:29,000 --> 00:11:31,366 136 00:11:31,366 --> 00:11:36,432 Let's again look at the preparation when undercuts are blocked out. 137 00:11:36,433 --> 00:11:38,066 138 00:11:38,066 --> 00:11:43,266 Here is the default situation with blocked out undercuts. 139 00:11:43,266 --> 00:11:45,899 140 00:11:45,900 --> 00:11:50,166 Undercuts are always blocked out parallel to the insertion axis 141 00:11:50,166 --> 00:11:50,199 142 00:11:50,200 --> 00:11:56,833 unless you explicitly choose an angle that should be applied for blocking out undercuts. 143 00:11:56,833 --> 00:12:03,766 144 00:12:03,766 --> 00:12:08,766 For instance, this might be done when conical tools are used in the CAM. 145 00:12:08,766 --> 00:12:11,099 146 00:12:11,100 --> 00:12:15,100 Let's come back to the default settings. 147 00:12:15,100 --> 00:12:19,066 148 00:12:19,066 --> 00:12:26,532 The slider "Don't block out zone near prepline" defines an "untouchable zone" around the preparation margin 149 00:12:26,533 --> 00:12:31,133 where the crown is never blocked out. 150 00:12:31,133 --> 00:12:38,299 151 00:12:38,300 --> 00:12:45,266 You see now how the upper part is blocked out, but as soon as the untouchable zone is reached, 152 00:12:45,266 --> 00:12:48,832 the crown bottom will go back to the preparation. 153 00:12:48,833 --> 00:12:54,866 Note that these settings may create undercuts in the crown bottom, marked in red. 154 00:12:54,866 --> 00:13:00,466 It might not be possible to produce this kind of restoration with 3-axis milling. 155 00:13:00,466 --> 00:13:01,966 156 00:13:01,966 --> 00:13:05,566 The default value in our generic version is 0.1 mm. 157 00:13:05,566 --> 00:13:13,032 This means that just a very small area at the crown margin has not been blocked out. 158 00:13:13,033 --> 00:13:13,166 159 00:13:13,166 --> 00:13:18,866 Now I will demonstrate the behavior with "Don't block out zone near prepline" set to 0, 160 00:13:18,866 --> 00:13:22,166 a setting commonly used in 3-axis mode. 161 00:13:22,166 --> 00:13:23,066 162 00:13:23,066 --> 00:13:28,866 As you can see, the crown will not be in contact with the preparation along the margin. 163 00:13:28,866 --> 00:13:31,866 These gaps are marked in magenta. 164 00:13:31,866 --> 00:13:34,499 165 00:13:34,500 --> 00:13:40,466 In 5-axis mode I recommend to set this value equal to the cement gap distance. 166 00:13:40,466 --> 00:13:47,366 This helps you to ensure that the crown is completely in contact with the preparation in the green area. 167 00:13:47,366 --> 00:13:48,766 168 00:13:48,766 --> 00:13:51,732 Let's switch back to the sectional view. 169 00:13:51,733 --> 00:13:55,699 170 00:13:55,700 --> 00:14:00,233 We will now have a look at the "Anticipate milling" feature. 171 00:14:00,233 --> 00:14:01,666 172 00:14:01,666 --> 00:14:08,366 This feature will add a tool diameter compensation to the cement gap for sharp edges. 173 00:14:08,366 --> 00:14:14,099 If you have selected a material for milling, it is checked per default. 174 00:14:14,100 --> 00:14:16,000 175 00:14:16,000 --> 00:14:19,600 If unchecked, no tool compensation will be computed 176 00:14:19,600 --> 00:14:19,633 177 00:14:19,633 --> 00:14:24,333 and sharp edges are just blocked out with the cement gap. 178 00:14:24,333 --> 00:14:26,733 179 00:14:26,733 --> 00:14:34,333 Use the "Diameter" slider to define the diameter of the smallest tool that is used in milling the crown bottom. 180 00:14:34,333 --> 00:14:36,666 181 00:14:36,666 --> 00:14:50,166 It is beneficial to choose a value slightly higher than the diameter of the actual tool you are using, e.g. choose 1.2 mm when milling with a 1 mm tool. 182 00:14:50,166 --> 00:14:50,499 183 00:14:50,500 --> 00:14:59,300 The "Bullnose/flat tool" checkbox enables a tool compensation for flat cylindrical tools instead of a spherical tool shape. 184 00:14:59,300 --> 00:15:03,266 185 00:15:03,266 --> 00:15:08,599 "Tool tip flat percentage" should be used to adjust the tool shape. 186 00:15:08,600 --> 00:15:09,066 187 00:15:09,066 --> 00:15:14,832 Here is a graphic to explain the percentage value when the Bullnose Tool is used. 188 00:15:14,833 --> 00:15:17,933 189 00:15:17,933 --> 00:15:22,866 Changes in the undercut settings always have to be applied. 190 00:15:22,866 --> 00:15:26,899 191 00:15:26,900 --> 00:15:30,900 The tool compensation looks flat now. 192 00:15:30,900 --> 00:15:38,300 193 00:15:38,300 --> 00:15:42,300 Let's come back to the default setting. 194 00:15:42,300 --> 00:15:48,533 195 00:15:48,533 --> 00:15:55,133 The button "Show undercuts" leads to the cement gap undercuts being displayed with a color scale. 196 00:15:55,133 --> 00:15:56,466 197 00:15:56,466 --> 00:16:07,332 Note: If at any point in this step you find that the insertion axis is not optimally defined, you can still easily change it in the right-mouse context menu. 198 00:16:07,333 --> 00:16:08,333 199 00:16:08,333 --> 00:16:11,466 Now you can proceed to the next step. 200 00:16:11,466 --> 00:16:19,666 201 00:16:19,666 --> 00:16:28,199 The software's exact block-out behavior depends on the material configuration provided by your system integrator. 202 00:16:28,200 --> 00:16:35,733 In most material configurations for 5-axis milling, the cement gap is applied after doing the block- out. 203 00:16:35,733 --> 00:16:43,833 This means that for steep preparations, generating the cement gap itself may cause new undercuts. 204 00:16:43,833 --> 00:16:45,533 205 00:16:45,533 --> 00:16:51,299 In 5-axis configuration, very often a defined zone near the margin line is not blocked out. 206 00:16:51,300 --> 00:16:56,233 This also could cause new undercuts in the margin area. 207 00:16:56,233 --> 00:17:02,333 But that is fine - a 5-axis machine can produce these and it will give an optimal result. 208 00:17:02,333 --> 00:17:10,633 In the standard 5-axis configuration, changes in the cement gaps will usually be computed and visualized in real time. 209 00:17:10,633 --> 00:17:22,499 210 00:17:22,500 --> 00:17:32,733 For 3- or 4-axis production, material configurations typically define an additional block- out being applied after generating the cement gap 211 00:17:32,733 --> 00:17:36,733 to avoid any undercuts that 4-axis machines cannot mill. 212 00:17:36,733 --> 00:17:37,333 213 00:17:37,333 --> 00:17:45,266 For the same reason, undercuts are very often blocked out all the way down to the margin using a value set to 0. 214 00:17:45,266 --> 00:17:49,532 But this configuration could create gaps in the crown border. 215 00:17:49,533 --> 00:17:56,399 As already mentioned in this tutorial, such gaps are to be indicated with magenta color on the borders. 216 00:17:56,400 --> 00:17:57,400 217 00:17:57,400 --> 00:18:05,633 Note that computing the block-out of the cement gaps with 3-axis configuration is a computationally intensive operation 218 00:18:05,633 --> 00:18:08,166 and cannot be done in real time. 219 00:18:08,166 --> 00:18:11,699 220 00:18:11,700 --> 00:18:14,766 Therefore, when adjusting the parameters, 221 00:18:14,766 --> 00:18:22,866 you might be prompted to click "Preview result after block out..." to preview the result including the block-out. 222 00:18:22,866 --> 00:18:27,066 223 00:18:27,066 --> 00:18:30,466 Thank you for watching this video.