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ePaper created 2015-03-06, 14:42:46 | version 1.33.01
16 I I CE article _ biomechanical principles Adhesivelyretainedrestorationsofferthepossi- bility to be more minimally invasive while restoring a tooth to natural appearance and function. More conservativeremovaloftoothstructurealsomeans there is less risk to the pulp. The converse is true in that cohesively retained restorations are more invasive. Removal of more structureincreasespulpalrisk,decreasesstrengthand increases tooth flexure, which may lead to fracture. Tooth preparation is also more important as retention and resistance form is essential to retain the crown. A laboratory can fabricate minimally in- vasive, adhesively retained restorations. However, chairside CAD/CAM technology can fabricate excellent restorations of the same quality in the same visit. This means the challenge of fabri- cating a provisional for a tooth preparation that Fig. 23_Scanning preparations. Fig. 24a_Scanning opposing teeth. Fig. 24b_PlanScan screenshot of scanning opposing teeth. Fig.24c_Opposingmodelscreenshot. Fig. 25a_Scanning buccal bite. Fig. 25b_Screenshot of scanning buccal bite. Fig. 26a_Screenshot of buccal bite. Fig.26b_Screenshotofoccludedmodels. Fig. 26c_Screenshot of preparations in density view. Fig. 26d_Screenshot of orientation of preparation model. Fig. 26e_Tracing margins. Fig. 26f_Tracing margins in ice view. Fig. 26g_Initial proposal of restoration for #4. Figs. 26h & i_Initial proposal of restorations for #3 and #4. Fig. 26j_Restorations #3 and #4, checking material thickness in occlusal view. CAD/CAM 1_2015 Fig. 24cFig. 24b Fig. 24aFig. 23 Fig. 26e Fig. 26f Fig. 26b Fig. 26c Fig. 26g Fig. 26d Fig. 25a Fig. 25b Fig. 26a CAD0115_12-21_Young 02.03.15 12:38 Seite 5 CAD0115_12-21_Young 02.03.1512:38 Seite 5