[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-402618-105":59,"doc-detail-402618-en":131},{"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":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","lava-all-ceramic-system-preparation-guidelines","Lava™ All-Ceramic System - Preparation Guidelines","","Preparation guidelines for Lava™ all-ceramic crowns, bridges, Maryland bridges, and inlay bridges, focusing on required geometric parameters and finishing features. The document specifies minimum circumferential shoulder/chamfer angles, rounded internal contours, rounded occlusal/incisal edges, and continuous visible margins while avoiding bevels and unacceptable configurations. It also defines reduction depths for anterior and posterior crowns, tangential preparation cautions, zirconia framework thickness requirements, veneering/glazing needs, and retentive element radii to ensure adequate strength and favorable fit.",{"@graph":69,"@context":123},[70,84,106],{"@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/lava-all-ceramic-system-preparation-guidelines/402618/",{"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/lava-all-ceramic-system-preparation-guidelines/402618.png","ImageObject",300,407,{"name":92,"@type":93},"Hazel","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",16,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What are the minimum angles and contours required for Lava™ crown preparation?","Question",{"text":113,"@type":114},"A circumferential shoulder or chamfer should have a horizontal angle of at least 5° and a vertical preparation angle of at least 4°. The inside angle must have a rounded contour, and all occlusal and incisal edges should be rounded.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"Why should bevels be avoided in the preparation margin?",{"text":118,"@type":114},"The preparation margin needs to be continuous and clearly visible, and a bevel should be avoided to maintain the required margin characteristics and visibility.",{"name":120,"@type":111,"acceptedAnswer":121},"What thickness and veneering/glazing conditions apply to Maryland bridges and inlay bridges?",{"text":122,"@type":114},"Maryland bridges require up to 0.7 mm preparation depth in enamel, with zirconia framework wall thickness at least 0.5 mm. Veneering/glazing is needed to prevent abrasion of the antagonist; if sufficient enamel thickness cannot support the minimum combined thickness, the dentist should re-evaluate the indication.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},402618,1790786705,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":14,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":24,"preview_page_count":4},137441390410,"https://ap-avatar.wpscdn.com/avatar/2000252f4ab5702993?_k=1776741390130283984","3MESPE  \nLava™ All-Ceramic System  \nPreparation for Lava™ Crowns & Bridges  \nIdeally, the preparation includes a circumferential shoulder or chamfer with a horizontal angle of at least 5° . The vertical preparation angle should be at least 4° . The inside angle of the shoulder preparation must be given a rounded contour. All occlusal and incisal edges should also be rounded.  \nThe marginal edge of the preparation needs to be continuous and clearly visible. A bevel should be avoided. For posterior and anterior teeth, a supragingival margin poses no problems. Due to the tooth-colored framework, very aesthetic results can be achieved.  \nAnterior Crown  \n• 1.5-2.0 mm incisal reduction  \n• 1.0-1.5 mm labial and lingual reduction  \n• Round the internal line angles  \n• Chamfer margin  \nPosterior Crown  \n• 1.5-2.0 mm occlusal/incisal reduction  \n• 1.0-1.5 mm axial reduction  \n• Round the internal line angles  \n• Chamfer margin  \nTangential Preparation  \nSteep tangential preparations may result in extremely thin tapered margins. In principle, this type of preparation is possible, but caution is advised.  \nUnacceptable Preparation for Lava™ Crowns & Bridges  \n3MESPE  \nLava™ All-Ceramic System  \nLava™ All-Ceramic System is a registered trademark of 3M ESPE  \nPreparation for Maryland Bridges   \nPreparation Depth: Up to 0.7 mm; The preparation needs to be in enamel instead of dentin. The enamel depth of a tooth can vary from 0.4 to 1.0 mm. Wall thickness of zirconia framework: 0.5 mm minimum to ensure sufficient strength.  \nVeneering: 0.1 mm (Glazing is necessary to prevent abrasion of antagonist); If the preparation depth can not be realized with the minimum wall thickness of 0.6 mm (zirconia + glazing) due to insufficient enamel thickness, the dentist should re-evaluate this indication. If the zirconia is not glazed, the restoration should not have any occlusal contact. We recommend the use of a preparation matrix, before tooth preparation, to be able to check the preparation depth.  \nFor the preparation of retentive elements see figure 1 and 3 (e.g. pinholes, seating groove) . A radius of> 0.4 mm is required for the Lava™ milling system.  \nRemember: Adhesive & inlay bridges are complex. It’s important to follow guidelines to avoid inferior marginal adaptation and lengthy manual fitting efforts after milling.  \nFigure 1: Rounded angles (Radius > 0.4 mm, no sharp edges), clear margin and horizontal angle > 2° .  \nFigure 2: Retentive element: rounded ridge (Radius > 0.4 mm.  \nFigure 4: Not possible: circular preparation of the wings, no preparation in the middle, only one preparation margin can be detected by the system.  \nFigure 3: Retentive element: rounded pinhole (no sharp edges,  \nradius > 0.4 mm) .  \n3MESPE  \nDental Products  \n3M Center Building 275-2SE-03  \nSt. Paul, MN55144-1000  \nDistributed by  \nAuthorized Milling Center  \n(800) 443-8048  \nPreparation for Inlay Bridges   \nPreparation Depth: 2-4 mm; It is important to have sufficient space for a connector of 9 mm2. The preparation should have a taper of > 2°-3° and have no friction. The margins must be clearly indicated. Full ceramic preparation in general requires rounded angles (no sharp edges, minimum radius > 0.4 mm) . Wall thickness of zirconia inlay: > 0.5 mm.  \nVeneering: Veneering or glazing is necessary to prevent abrasion of antagonist. Maximal length of pontic: 10 mm.  \nFigure 5: Proximal view inlay prep. Figure 6: Occlusal view inlay prep. Figure 7A and 7B: Additional lingual or vestibular wing only with an extension  \nmaximally until tooth equator.  \nIn the case of vestibular and lingual/palatinal wings in addition to the inlay cavity, the wings can be prepared by the Lava™  \nsystem maximally until a 90° angle to the inlay preparation (see figure 7A & 7B) . Guide 011909","cbCaiq9QJUQpotTb","https://ap.wps.com/l/cbCaiq9QJUQpotTb","pdf",2292585,"English","# Lava™ All-Ceramic System Preparation for Crowns & Bridges\n## Anterior Crown Preparation\n## Posterior Crown Preparation\n## Tangential Preparation\n## Unacceptable Preparation\n# Preparation for Maryland Bridges\n## Preparation Depth and Enamel Requirement\n## Veneering and Glazing\n## Retentive Elements and Radius Requirements\n# Preparation for Inlay Bridges\n## Preparation Depth and Space for Connector\n## Margins and Geometry\n## Veneering/Glazing and Pontic Length\n## Figures (1-7B)","[{\"question\":\"What are the minimum angles and contours required for Lava™ crown preparation?\",\"answer\":\"A circumferential shoulder or chamfer should have a horizontal angle of at least 5° and a vertical preparation angle of at least 4°. The inside angle must have a rounded contour, and all occlusal and incisal edges should be rounded.\"},{\"question\":\"Why should bevels be avoided in the preparation margin?\",\"answer\":\"The preparation margin needs to be continuous and clearly visible, and a bevel should be avoided to maintain the required margin characteristics and visibility.\"},{\"question\":\"What thickness and veneering/glazing conditions apply to Maryland bridges and inlay bridges?\",\"answer\":\"Maryland bridges require up to 0.7 mm preparation depth in enamel, with zirconia framework wall thickness at least 0.5 mm. Veneering/glazing is needed to prevent abrasion of the antagonist; if sufficient enamel thickness cannot support the minimum combined thickness, the dentist should re-evaluate the indication.\"}]","Lava™ All-Ceramic System - Preparation Guidelines | PDF",1790532174]