[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-402624-105":59,"doc-detail-402624-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","cerec-3d-preparation-guidelines-tooth-preparation-requirements","CEREC 3D Preparation Guidelines - Tooth Preparation Requirements","","CEREC restoration success depends on precise tooth preparation tailored to ceramic requirements. The guidelines explain how CEREC milling instruments work and how their limits affect preparation design, including fitting-surface (intaglio) milling and occlusal-only milling. Key parameters include effective bur length and minimum distances, appropriate preparation width to accommodate the Step Bur tip, safe vertical wall heights using taper, management of tight corners and extensions to avoid binding, and minimum thickness rules for axial walls, cusps, and fissures.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/cerec-3d-preparation-guidelines-tooth-preparation-requirements/402624/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/cerec-3d-preparation-guidelines-tooth-preparation-requirements/402624.png","ImageObject",300,407,{"name":92,"@type":93},"Asher","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-31","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":56},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How does the Step Bur 10 influence the CEREC preparation guidelines?","Question",{"text":112,"@type":113},"The Step Bur 10 is positioned to mill the intaglio (fitting surface) and therefore has the greatest bearing on the preparation requirements. Its effective milling length and tip dimensions set key limits for preparation geometry.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What minimum occlusal width is recommended for anterior teeth?",{"text":117,"@type":113},"Anterior tooth preparation must account for the 1.0 mm tip of the Step Bur 10, so the width of the preparation at the occlusal should not be less than 1.0 mm.",{"name":119,"@type":110,"acceptedAnswer":120},"What taper and wall-length guidance applies to unusually tall vertical walls?",{"text":121,"@type":113},"Vertical walls greater than 4 mm in length need caution. Surfaces longer than 4 mm should have a 3° taper or greater because of the bur’s internal “steps.” If 3° taper cannot be achieved, use the Step Bur mode in the Milling Preview stage.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},402624,1791213945,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":56,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":34,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},687197207639,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","Preparation  \nThe key to any great restoration fabricated by the CEREC technique is a great tooth preparation. The requirements for ceramics tend to be a little different than that of traditional featheredge and bevel techniques used for gold or other materials.  \nDetailed below are basic preparation guidelines including the recommended instruments that will help you achieve the desired results.  \nCEREC ®  \nGuidelines  \nCEREC 3D Preparation Guidelines  \nBefore knowing exactly what the preparation guidelines are for CEREC, we must first understand how the milling instruments work and what we can do with them.  \nLet us start with the orientation of the milling instruments. The Step Bur 10 is positioned on the left side of the milling unit and is responsible for milling the intaglio (fitting surface) of the restoration. For this reason the Step Bur 10 has the greatest bearing on our preparation guidelines. The Cylinder Pointed bur, positioned on the right side of the milling unit, mills only the occlusal surface and therefore has little imact on these preparation guidelines.  \nLet’s now look at the dimensions of the available milling instruments. The Step bur 10 has an effective milling length of 10.5 mm.  \nStep bur 10  \nMills the fitting surface of the restoration  \nCylinder Pointed bur  \nMills the occlusal surfaces only  \nAs you can see below, our first preparation requirement is: the lowest point of the preparation  \nshould not be greater than 10.5 mm from the highest point.  \nHere’s another way of looking atthe same case:  \nSo much for the length, what about the diameter of the burs?  \nWith molar preparations the diameter of the bur does not have too great an effect. As we approach the anterior, however, the diameter becomes more important due to the fact anterior teeth are generally smaller than the posteriors, especially in the mandible.  \nPreparation of anterior teeth must account for the 1.0 mm tip of the Step Bur 10 carving the inside of the crown. For example, the width of the preparation atthe occlusal should not be less than 1.0 mm. See below:  \nTall vertical walls  \nUnusually tall vertical walls (greater than 4 mm in length) need caution due to the configuration of the Step Bur which is used to mill the intaglio of all restorations. The Step Bur is able to milla 0° surface which is less than 4 mm in length. Surfaces greater than 4 mm in length should have a 3° taper or greater. This is due to the “steps” of the bur. See below:  \nNearly all restorations can be milled with only the top 4 mm of the Step Bur. For surfaces greater in length (e.g. endo restorations) please be sure the preparation has at least 3° of taper.  \nIf 3° of taper cannot be achieved be sure to mill in the “Step Bur” mode (this mode can be selected in the  \nMilling Preview stage) .  \nTight Corners  \nAnother area of concern with regard to the milling instruments is corners and extensions. Keeping in mind the diameter of the two instruments (Cylinder Pointed Bur: 1.6 mm and Step Bur 10: 1.0 mm) we can recognize areas where the instruments are unable to adequately remove material. For example:  \nObviously the Step Bur 10 would have great difficulty milling such a corner. The arrows indicate the areas of immediate binding. The software will also attempt to incorporate the tapered burin such cases, but it is often not an ideal result, leaving behind excess material which the operator must manually adjust.  \nRecommendation:  \nEnsure corners of the cavosurface margin have greater than 1.0 mm diameter.  \nOcclusal Reduction  \nThe first step to a successful preparation for CEREC is proper occlusal reduction. As shown below, these are the minimum requirements recommended by the various block manufacturers.  \nThe following are the recommended minimum thicknesses: minimum axial wall thickness = 1.0 mm; minimum thickness under a cusp = 1.5 mm (anterior), 2.0 mm (posterior); minimum thickness under a fissure = 1.5-2.0 mm.  \nOne way to ensure that you have a fast, ","cbCair8IbewMmWdJ","https://ap.wps.com/l/cbCair8IbewMmWdJ","pdf",4475756,"English","# CEREC 3D Preparation Guidelines\n## Milling Instrument Orientation and Effective Length\n## Preparation Requirements: Lowest Point and Bur Dimensions\n## Anterior Tooth Preparation and Minimum Occlusal Width\n## Vertical Wall Height and Taper Rules\n## Tight Corners and Binding Areas\n## Recommendation for Cavo-Surface Margin Diameter\n## Occlusal Reduction and Minimum Thicknesses\n## Full Crown and Inlay/Onlay Preparations","[{\"question\":\"How does the Step Bur 10 influence the CEREC preparation guidelines?\",\"answer\":\"The Step Bur 10 is positioned to mill the intaglio (fitting surface) and therefore has the greatest bearing on the preparation requirements. Its effective milling length and tip dimensions set key limits for preparation geometry.\"},{\"question\":\"What minimum occlusal width is recommended for anterior teeth?\",\"answer\":\"Anterior tooth preparation must account for the 1.0 mm tip of the Step Bur 10, so the width of the preparation at the occlusal should not be less than 1.0 mm.\"},{\"question\":\"What taper and wall-length guidance applies to unusually tall vertical walls?\",\"answer\":\"Vertical walls greater than 4 mm in length need caution. Surfaces longer than 4 mm should have a 3° taper or greater because of the bur’s internal “steps.” If 3° taper cannot be achieved, use the Step Bur mode in the Milling Preview stage.\"}]","CEREC 3D Preparation Guidelines - Tooth Preparation Requirements | PDF",1790532188,18]