[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-403487-105":59,"doc-detail-403487-en":127},{"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":120,"head_meta":122,"extra_data":124,"updated_unix":126},105,"en","lec-3-fixed-prosthodontics-finish-line-configuration","LEC 3 Fixed Prosthodontics - Finish Line Configuration","","Finish Line Configuration for fixed prosthodontics explains key principles for margin design in crown preparations, emphasizing ease of preparation and identification, a clear boundary for wax pattern finishing, conservation of tooth structure, adequate material bulk for esthetics and strength, and—most importantly—consistent marginal integrity. It classifies finish lines by design/configuration and width, then details knife-edge (feather end), chamfer, heavy chamfer, and shoulder types with their forming angles, instruments, advantages, disadvantages, and clinical indications, including uses for metal and veneer crown surfaces.",{"@graph":69,"@context":119},[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/lec-3-fixed-prosthodontics-finish-line-configuration/403487/",{"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/lec-3-fixed-prosthodontics-finish-line-configuration/403487.png","ImageObject",300,407,{"name":92,"@type":93},"Chumphorn","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-06","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",17,{"@type":107,"mainEntity":108},"FAQPage",[109,115],{"name":110,"@type":111,"acceptedAnswer":112},"How do chamfer and heavy chamfer finishing lines differ in preparation and clinical purpose?","Question",{"text":113,"@type":114},"Chamfer is a deeper, well-defined finishing line with a wider cavo-surface angle and provides adequate cervical space for contour while being thicker and unburnishable; it is mainly used for full metal crown and specific veneer/post crown surfaces. Heavy chamfer provides better ceramic support and is achieved with a 90° cavo-surface angle and internal radius, but an unskilled operator may create a fragile enamel lip.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"What is the role of a shoulder (butt shoulder) finishing line in terms of tooth structure and indications?",{"text":118,"@type":114},"A shoulder finishing line is the least conservative because it removes more tooth structure, but axial walls meet the finishing line at a right angle, providing bulk needed for strength and esthetics. It is used when bulk is required, especially with jacket crowns made of brittle porcelain or acrylic resin that require sufficient thickness to resist occlusal forces.","https://schema.org",{"og:url":83,"og:type":121,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":123,"canonical":83},"index,follow",{"doc_id":125,"site_id":62},403487,1790598189,{"code":4,"msg":5,"data":128},{"doc_id":125,"user_id":129,"nickname":92,"user_avatar":130,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":136,"language":137,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":138,"faqs":139,"seo_title":140,"seo_description":67,"update_tm":141,"read_time":142,"preview_page_count":4},2336475401981,"https://ap-avatar.wpscdn.com/avatar/22000c94efd8d5204d?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786935347598174694","| LEC 3 Fixed Prosthodontics ﻋﻠﻲ اﺣﺴﺎن اﻟﻘﺮﺷﻲ .د\u003Cbr>Finish Line Configuration\u003Cbr>Guidelines for Margin Design:\u003Cbr>1. Ease of preparation without overextension or unsupported enamel.\u003Cbr>2. Ease of identification in the impression and on the die.\u003Cbr>3. A distinct boundary to which wax pattern can be finished.\u003Cbr>4. Conservative of tooth structure.\u003Cbr>5. Sufficient bulk of material for esthetic and strength of the restoration.\u003Cbr>6. The most important consideration in selecting a cervical margin design is its ability to consistently and predictably provide excellent marginal integrity. |  |\n| --- | --- |\n| | |\n| Finish line Classification:\u003Cbr>A. according to its design or configuration\u003Cbr>1. Knife edge (also named \"feather end\")\u003Cbr>2. Chamfer\u003Cbr>3. Heavy chamfer\u003Cbr>4. Shoulder\u003Cbr>5. Radial shoulder\u003Cbr>6. Shoulder with bevel\u003Cbr>7. Sloping shoulder\u003Cbr>8. Chisel edge\u003Cbr>1 |  |\n\nLEC 3 Fixed Prosthodontics ﻋﻠﻲ اﺣﺴﺎن اﻟﻘﺮﺷﻲ .د  \nB. According to width:  \n1. Marginal width less than 0.3mm – knife-edge/feather edge  \n2. Marginal width up to 0.3mm – Chamfer  \n3. Marginal width greater than 0.3mm-Shoulder  \n1. Knife edge or feather end finishing line (shoulder-less)  \nA pointed end tapered fissure bur (long needle diamond fissure bur) is used to provide this type of margin design. It is the most conservative type of finishing line since the least amount of tooth structure is removed, but the margin is weak since this margin design does not provide enough bulk or thickness for the material. It forms >135° cavo-surface line angle.  \n2  \nLEC 3 Fixed Prosthodontics ﻋﻠﻲ اﺣﺴﺎن اﻟﻘﺮﺷﻲ .د  \nAdvantages of knife edge finishing line  \n1. It is the most conservative type of finishing line.  \n2. It is easy to prepare.  \n3. It is a burnishable type of finishing line. i.e. it provides a burnishable margin. Burnishing is the further adaptation of the margin of metal restoration to the  \ntooth structure.  \nDisadvantages of knife edge finishing line  \n1. Difficult to be identified by the laboratory technician.  \n2. It provides a thin margin that is difficult to accurately wax and cast.  \n3. The margin of the restoration is susceptible to distortion since this type of margin design does not provide enough thickness.  \nIndications of knife edge finishing line  \nNOT recommended:  \nHere are some reasons why a knife edge or feather edge finish line may not be recommended for crown preparations:  \n1. Marginal Integrity: These types of finish lines may be more susceptible to chipping, microleakage, or other issues over time.  \n2. Fracture Resistance: Thin and sharp margins may increase the risk of crown fracture.  \n3. Cementation Challenges: These types of margins may not allow for sufficient space for the cement.  \n4. Periodontal Health: It may be more challenging for patients to keep the area clean, increasing the risk of inflammation and periodontal issues.  \nIt is mainly used for:  \n1. Full Metal Crown.  \n2. The lingual and proximal surfaces of full veneer crown, three-quarter crown and post crown.  \n3  \nLEC 3 Fixed Prosthodontics ﻋﻠﻲ اﺣﺴﺎن اﻟﻘﺮﺷﻲ .د  \n2. Chamfer finishing line  \nIt is a well-defined finishing line somewhat like knife edge finishing line except that the cut is made deeper. It forms a 130-160° cavo-surface line angle. A roundend tapered fissure bur is used to obtain this preparation margin. It provides adequate space at the cervical region so can make the contour of the crown restoration within the contour of natural tooth without overcontouring of the final restoration. However, since the restoration margin obtained with this type of finishing line is thick, so it is unburnishable.  \nThis type of finishing line is indicated for areas to be covered by metal only asthe knife edge finishing line, so it is mainly used for:  \n1. Full Metal Crown (All the surfaces) .  \n2. The lingual and proximal surfaces of full veneer crown, three-quarter crown and post crown.  \n4  \nLEC 3 Fixed Prosthodontics ﻋﻠﻲ اﺣﺴﺎن اﻟﻘﺮﺷﻲ .د  \nAdvantages ofChamfer finishing lin","cbCaiej2Ux9Vog47","https://ap.wps.com/l/cbCaiej2Ux9Vog47","pdf",4933827,11,"English","# Finish Line Configuration\n## Guidelines for Margin Design\n## Finish line Classification\n## Knife edge (feather end)\n### Advantages\n### Disadvantages\n### Indications\n## Chamfer finishing line\n### Advantages\n### Disadvantages\n## Heavy chamfer finishing line\n### Advantages\n### Disadvantages\n## Shoulder finishing line (butt shoulder)\n### Indications\n### Advantages\n### Disadvantages","[{\"question\":\"How do chamfer and heavy chamfer finishing lines differ in preparation and clinical purpose?\",\"answer\":\"Chamfer is a deeper, well-defined finishing line with a wider cavo-surface angle and provides adequate cervical space for contour while being thicker and unburnishable; it is mainly used for full metal crown and specific veneer/post crown surfaces. Heavy chamfer provides better ceramic support and is achieved with a 90° cavo-surface angle and internal radius, but an unskilled operator may create a fragile enamel lip.\"},{\"question\":\"What is the role of a shoulder (butt shoulder) finishing line in terms of tooth structure and indications?\",\"answer\":\"A shoulder finishing line is the least conservative because it removes more tooth structure, but axial walls meet the finishing line at a right angle, providing bulk needed for strength and esthetics. It is used when bulk is required, especially with jacket crowns made of brittle porcelain or acrylic resin that require sufficient thickness to resist occlusal forces.\"}]","LEC 3 Fixed Prosthodontics - Finish Line Configuration | PDF",1790540811,28]