[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-402617-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-402617-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","pfm-crown-preparation-adex-2020-preparation-criteria","PFM CROWN PREPARATION - ADEX 2020 - Preparation Criteria","","PFM crown preparation criteria for evaluating dental tooth preparation quality. The document defines critical, acceptable, marginal, and deficiency levels across cervical margin position and extension, margin definition and bevel presence, facial and lingual widths, and the line of draw relative to the tooth long axis. It further assesses axial tissue removal, axial wall smoothness and undercut depth, tooth taper per wall, occlusal reduction amount, internal line angle and cusp tip rounding, and treatment management including adjacent and opposing tooth condition and surrounding gingival or typodont damage.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/pfm-crown-preparation-adex-2020-preparation-criteria/402617/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/pfm-crown-preparation-adex-2020-preparation-criteria/402617.png","ImageObject",300,407,{"name":42,"@type":43},"Aria","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-07","2026-09-27",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",8,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What cervical margin extension measurements define acceptable, marginal, and critical deficiency outcomes?","Question",{"text":63,"@type":64},"Acceptable requires the cervical margin to be ≤0.5 mm below and ≤1.5 mm above the simulated free gingival margin. Marginal over-extension exceeds 0.5 mm below. Critical over-extension exceeds 0.5 mm below causing visual damage to the typodont, or under-extension exceeds 1.5 mm above.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How is the line of draw assessed in the criteria?",{"text":68,"@type":64},"The path of insertion/line of draw should deviate by less than 20° from the tooth long axis for acceptable. Marginal deviation is 20° to less than 30°, while critical deficiency is deviation of 30° or more.",{"name":70,"@type":61,"acceptedAnswer":71},"What evaluation criteria are used for treatment management of adjacent and opposing teeth?",{"text":72,"@type":64},"Acceptable outcomes allow damage to adjacent teeth to be removed by polishing without altering contour shape or contact. Marginal outcomes require recontouring that changes contact shape/position, or opposing hard tissue shows minimal damage inconsistent with the procedure. Critical deficiency includes gross damage to adjacent teeth needing restoration or gross alterations to opposing hard tissue inconsistent with the procedure.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},402617,1790908618,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,110,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":108,"slug":109},7,40,"healthcare",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":107,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":26,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":97,"preview_page_count":4},2336464648322,"https://ap-avatar.wpscdn.com/avatar/2200025388227c56fec?_k=1778556882303663488","20  \nPFM CROWN PREPARATION  \nADEX 2020  \n\n| CRITICAL ERRORS |  |  |\n| --- | --- | --- |\n|  |  |  |\n| Wrong tooth/surface treated  | No | Yes |\n|  |  |  |\n| Procedure not challenged  | No | Yes |\n\n\n|  |  | ACC = Adheres to Criteria SUB = Marginally Substandard DEF = CriƟcal Deficiency |  |\n| --- | --- | --- | --- |\n| CERVICAL MARGIN AND DRAW |  |  |  |\n| \u003Cbr>Margin/Extension |  |  |  |\n| ACC | The cervical margin is ≤ 0.5 mm below to ≤ 1.5 mm above the simulated free gingival margin. |  |  |\n| SUB | A. The cervical margin is over-extended > 0.5 mm below the simulated free gingival margin. |  |  |\n| DEF | A. The cervical margin is over-extended by > 0.5 mm below the simulated free gingival margin, causing visual damage to the typodont.\u003Cbr>B. The cervical margin is under-extended by > 1.5 mm above the simulated free gingival margin. |  |  |\n| \u003Cbr>Margin/DefiniƟon |  |  |  |\n| ACC | The cervical margin is conƟnuous but may be slightly rough and may lack some definiƟon. The cervical bevel, when used, is ≤ 1.5 mm, and/or may lack some definiƟon. |  |  |\n| SUB | A. The cervical bevel, when used, is > 1.5 mm but ≤ 2.0 mm. |  |  |\n| DEF | A. The cervical bevel, when used, is > 2.0 mm.\u003Cbr>B. The cervical margin has no conƟnuity or definiƟon.\u003Cbr>C. The cervical margin is cupped or J-shaped. |  |  |\n| \u003Cbr>Margin/Facial Width |  |  |  |\n| ACC | The facial shoulder is > 0.5 mm but ≤ 2.0 mm in width. |  |  |\n| SUB | A. The facial shoulder is reduced > 2.0 mm but ≤ 2.5 mm. |  |  |\n| DEF | A. The facial shoulder is > 2.5 mm in width.\u003Cbr>B. The facial shoulder is \u003C 0.5 mm in width. |  |  |\n| \u003Cbr>Margin/Lingual Width |  |  |  |\n| ACC | The margin width varies slightly from visually & explorer detectable to ≤ 1.0 mm. |  |  |\n| SUB | A. The lingual margin is > 1.0 mm but ≤ 2.0 mm. |  |  |\n| DEF | A. The lingual margin is > 2.0 mm.\u003Cbr>B. The lingual margin is feathered and/or is not explorer detectable. |  |  |\n| \u003Cbr>Line of Draw |  |  |  |\n| ACC | The path of inserƟon/line of draw deviates \u003C 20° from the long axis of the tooth. |  |  |\n| SUB | The path of inserƟon/line of draw deviates 20° to \u003C 30° from the long axis of the tooth. |  |  |\n| DEF | The path of inserƟon/line of draw deviates ≥ 30° from the long axis of the tooth. |  |  |\n\nPFM CROWN PREPARATION (CONTINUED)  \n20  \n\n| WALLS, TAPER, AND SHOULDER |  |\n| --- | --- |\n| \u003Cbr>Axial Tissue Removal |  |\n| ACC | The axial Ɵssue removal is ≥ 0.5 mm but ≤ 2.0 mm. |\n| SUB | A. The axial Ɵssue removal is > 2.0 mm but ≤ 2.5 mm. |\n| DEF | A. The axial Ɵssue removal is > 2.5 mm.\u003Cbr>B. The axial Ɵssue removal is \u003C 0.5 mm. |\n| \u003Cbr>Axial Walls Smoothness/Undercut |  |\n| ACC | The walls may be slightly rough and may lack some definiƟon. |\n| DEF | There is an undercut, which, when blocked out, would compromise margin width criteria and/or is > 0.5 mm deep. |\n| \u003Cbr>Taper |  |\n| ACC | Taper is present, from nearly parallel to ≤ 12° per wall. |\n| SUB | There is excessive taper that is > 12° and ≤ 16° per wall. |\n| DEF | Taper is grossly over-reduced > 16° per wall. |\n| \u003Cbr>Occlusal ReducƟon |  |\n| ACC | Occlusal reducƟon is ≥ 1.0 mm but ≤ 2.5 mm. |\n| SUB | A. Occlusal reducƟon is > 2.5 mm but ≤ 3.0 mm. |\n| DEF | A. Occlusal reducƟon is > 3.0 mm.\u003Cbr>B. Occlusal reducƟon is \u003C 1.0 mm. |\n| \u003Cbr>Internal Line Angles |  |\n| ACC | Internal line angles and cusp Ɵp areas may not be completely rounded and may show a slight tendency of being sharp. |\n| DEF | The internal line angles or cusp Ɵp areas are excessively sharp with no evidence of rounding. |\n| TREATMENT MANAGEMENT |  |\n| \u003Cbr>CondiƟon of Adjacent/Opposing Teeth |  |\n| ACC | Any damage to adjacent tooth/teeth can be removed with polishing without adversely altering the shape of the contour and/or contact. |\n| SUB | A. Damage to adjacent tooth/teeth requires recontouring that changes the shape and/or posiƟon of the contact.\u003Cbr>B. Opposing hard Ɵssue shows minimal evidence of damage and/or alteraƟon inconsistent with the procedure. |\n| DEF | A. There is gross damage to ad","cbCaio20uMsnPCwa","https://ap.wps.com/l/cbCaio20uMsnPCwa","pdf",70369,"English","# PFM Crown Preparation\n## Cervical Margin and Draw\n## Walls, Taper, and Shoulder\n## Treatment Management","[{\"question\":\"What cervical margin extension measurements define acceptable, marginal, and critical deficiency outcomes?\",\"answer\":\"Acceptable requires the cervical margin to be ≤0.5 mm below and ≤1.5 mm above the simulated free gingival margin. Marginal over-extension exceeds 0.5 mm below. Critical over-extension exceeds 0.5 mm below causing visual damage to the typodont, or under-extension exceeds 1.5 mm above.\"},{\"question\":\"How is the line of draw assessed in the criteria?\",\"answer\":\"The path of insertion/line of draw should deviate by less than 20° from the tooth long axis for acceptable. Marginal deviation is 20° to less than 30°, while critical deficiency is deviation of 30° or more.\"},{\"question\":\"What evaluation criteria are used for treatment management of adjacent and opposing teeth?\",\"answer\":\"Acceptable outcomes allow damage to adjacent teeth to be removed by polishing without altering contour shape or contact. Marginal outcomes require recontouring that changes contact shape/position, or opposing hard tissue shows minimal damage inconsistent with the procedure. Critical deficiency includes gross damage to adjacent teeth needing restoration or gross alterations to opposing hard tissue inconsistent with the procedure.\"}]","PFM CROWN PREPARATION - ADEX 2020 - Preparation Criteria | PDF",1790532173]