[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-403489-105":59,"doc-detail-403489-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","crown-preparation-set-4384a-tissue-friendly-crown-margin-preparation","Crown preparation - Set 4384A - Tissue-friendly crown margin preparation","","Tissue-friendly crown preparation focuses on protecting periodontal health by placing crown margins in a non-traumatic way when supragingival placement is impossible due to defect morphology and esthetic demands. The set 4384A provides diamond instruments with guide pins to control horizontal and vertical cutting depth, reducing the “gutter” effect and helping preserve biological width. It covers specific instrument shapes, margin depths, clinical steps for orientation grooves and intrasulcular preparation, plus recommendations for heat control and compatible sonic tips.",{"@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/crown-preparation-set-4384a-tissue-friendly-crown-margin-preparation/403489/",{"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/crown-preparation-set-4384a-tissue-friendly-crown-margin-preparation/403489.png","ImageObject",300,407,{"name":92,"@type":93},"Terk","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-05","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why is non-traumatic crown margin placement important for periodontal health?","Question",{"text":112,"@type":113},"Non-traumatic placement helps avoid inflammation of the marginal periodontium. Subgingival margins can lead to more or less severe inflammation, so controlled, tissue-preserving preparation is needed.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What does the guide pin help control during crown preparation?",{"text":117,"@type":113},"The guide pin acts as a “horizontal distance keeper” to ensure an even cutting depth and avoid the “gutter” effect. It also functions as a “vertical distance keeper” by maintaining a pre-defined distance to the periodontium during subgingival margin preparation.",{"name":119,"@type":110,"acceptedAnswer":120},"What margin depths are achievable with set 4384A?",{"text":121,"@type":113},"Set 4384A can create a margin depth of 0.38 mm for size 018 and 0.54 mm for size 021, using the guide pin diamond instruments in specified grits.","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},403489,1791447315,{"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":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":14,"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":24,"preview_page_count":4},1099525198933,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","ProductInformation  \nCrown preparation | Set 4384A  \nThe non-traumatic placement of crown margins is one of the most important parameters for the periodontal health of a restored tooth. Previous studies have shown that subgingival restoration margins may lead to amore or less severe inflammation of the marginal periodontium. However, it is often impossible to place a restoration at supragingival level, due to the defect morphology and, especially in the anterior area, for esthetic reasons. In such cases it is necessary to place the restoration margin in anon-traumatic way without damaging the periodontal tissue.  \nDiamond instruments with guide pin for controlled tissue-preserving crown preparation.  \nIn cooperation with Prof. Günay of the Medical Academy in Hanover, Komet􀀟 has developed an instrument set for crown preparation which includes instruments with guide pin designed to meet these requirements: set 4384A includes several diamond instruments with uncoated guide pin (P = Pin) in the shapes tapered round (856P) and torpedo tapered (878KP), in medium grit for shaping and fine grit (8856P and 8878KP) for finishing. These instruments with guide pin can create a margin depth of 0.38 mm (size 018) or 0.54 mm (size 021) .  \nThe congruent instruments without guide pin are designed to increase the cutting depth incase of all-ceramic or veneer crowns.  \nThe egg shape (6379) is intended for palatinal or lingual reduction in case of capping anteriors. We recommend the use of an Arkansas stone (661) for finishing and rounding edges, corners and angles (if necessary also to create smooth marginal surfaces) .  \nA prerequisite for a successful tissuefriendly crown preparation is a sound periodontium which, if necessary, may be achieved  \nthrough a systematic periodontal therapy tobe completed beforehand.  \nAdvantages:  \n• Guide pin as “horizontal distance keeper”: For circular material reduction the guide pin guarantees controlled preparation with an even cutting depth. This way a uniform preparation is created, avoiding the “gutter” effect. Controlled preparation of a defined crown margin.  \n• Guide pin as “vertical distance keeper”: During the preparation of a subgingival margin the 0.5 mm long guide pin assures that a pre-defined distance to the periodontium is kept.  \nDamage to the biological width*(the area at the coronal side of the alveolar bone) is largely avoided.  \n* Average dimension of the biological width of a healthy periodontium is approx . 3 mm  \n[Gargiulo et al. J Periodontol 32, 261 (1961);  \nGünay et al. Dtsch Zahnärztl Z 56, 583 (2001)]  \nClinical sequence:  \n1. Occlusal orientation grooves with a tapered S diamond (S6878K.314.016) .  \n2. Buccal and palatinal orientation grooves with the same instrument. Following the orientation grooves the tooth is prepared on the vestibular and palatinal side on supragingival level up to the proximal surface. This is followed by the initial proximal separation and preparation to the level of the marginal gingiva with the same instrument in size 012 (S6878K.314. 012) .  \n3. Vestibular and intrasulcular preparation with a guide pin instrument (856P.314.021 for a more pronounced chamfer) . If the cutting depth created is sufficient for the requested restoration, the vestibular surface is then finished (8856P.314.021) .  \n4. SEM micrograph  \n5. In case of all-ceramic and veneer crowns the cutting depth is increased, if necessary, with a congruent diamond instrument without guide pin (8856.314.018) .  \n6. Palatinal and intrasulcular preparation with guide pin instrument (878KP.314.021 and 8878KP.314.021) for a slight chamfer.  \n7. Hint: The new sonic tips SF8878KM/Dare perfectly suited for completing the proximal preparation. Shown on the picture: SF8878KD in palatinal position.  \n8. One week after preparation: vestibularly, mesio and disto-vestibularly there is a pronounced chamfer, proximo-palatinallya slight chamfer.  \n9. Metal ceramic crown: vestibularly, mesio and disto-vestibul","cbCaie8XcrsHHh0S","https://ap.wps.com/l/cbCaie8XcrsHHh0S","pdf",889859,"English","# Crown preparation\n## Tissue-friendly margin placement\n## Instrument set 4384A\n## Clinical sequence\n## Recommendations for use","[{\"question\":\"Why is non-traumatic crown margin placement important for periodontal health?\",\"answer\":\"Non-traumatic placement helps avoid inflammation of the marginal periodontium. Subgingival margins can lead to more or less severe inflammation, so controlled, tissue-preserving preparation is needed.\"},{\"question\":\"What does the guide pin help control during crown preparation?\",\"answer\":\"The guide pin acts as a “horizontal distance keeper” to ensure an even cutting depth and avoid the “gutter” effect. It also functions as a “vertical distance keeper” by maintaining a pre-defined distance to the periodontium during subgingival margin preparation.\"},{\"question\":\"What margin depths are achievable with set 4384A?\",\"answer\":\"Set 4384A can create a margin depth of 0.38 mm for size 018 and 0.54 mm for size 021, using the guide pin diamond instruments in specified grits.\"}]","Crown preparation - Set 4384A - Tissue-friendly crown margin preparation | PDF",1790540815]