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System and Method for Designing Post and Core System Und Verfahren Zur Konstruktion Von Pfosten Und Kern Procédé Et Système De Conception De Tenon Radiculaire

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System and Method for Designing Post and Core System Und Verfahren Zur Konstruktion Von Pfosten Und Kern Procédé Et Système De Conception De Tenon Radiculaire (19) TZZ ZZ__T (11) EP 2 400 919 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: A61C 13/00 (2006.01) A61C 13/30 (2006.01) 02.04.2014 Bulletin 2014/14 (86) International application number: (21) Application number: 10707434.6 PCT/DK2010/050048 (22) Date of filing: 25.02.2010 (87) International publication number: WO 2010/097089 (02.09.2010 Gazette 2010/35) (54) SYSTEM AND METHOD FOR DESIGNING POST AND CORE SYSTEM UND VERFAHREN ZUR KONSTRUKTION VON PFOSTEN UND KERN PROCÉDÉ ET SYSTÈME DE CONCEPTION DE TENON RADICULAIRE (84) Designated Contracting States: • DEICHMANN, Nikolaj AT BE BG CH CY CZ DE DK EE ES FI FR GB GR S-218 51 Klagshamn (SE) HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL • FISKER, Rune PT RO SE SI SK SM TR DK-2830 Virum (DK) (30) Priority: 25.02.2009 DK 200900264 (74) Representative: Münzer, Marc Eric et al 20.03.2009 US 161850 P Guardian IP Consulting I/S Diplomvej, Building 381 (43) Date of publication of application: 2800 Kgs. Lyngby (DK) 04.01.2012 Bulletin 2012/01 (56) References cited: (73) Proprietor: 3Shape A/S WO-A2-2007/062658 DE-A1- 10 339 247 1060 Copenhagen (DK) FR-A- 1 456 600 US-A- 5 690 490 (72) Inventors: • CLAUSEN, Tais S-218 51 Klagshamn (SE) Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). EP 2 400 919 B1 Printed by Jouve, 75001 PARIS (FR) 1 EP 2 400 919 B1 2 Description is scanned, milled and sintered. The pattern is fabricated by the manual method of lubricating the canal with either Field of invention water or saliva, then placing autopolymerizing acrylic res- in on the plastic core with a brush and placing the post [0001] The present invention relates to a system and 5 into the canal. The post is maintained in position for a a method for providing the design of a dental post and few seconds, and then quickly removed for determining core, in particular relating to CAD/CAM design/manufac- if theentire anatomy of thecanal was recorded.If needed, ture of post and core. A post and core is typically a part more acrylic resin is applied to the post, the post is placed of a dental restoration. Moreover, the invention relates back into canal before it completely polymerizes, and to a computer-readable medium for implementing such 10 then moving the post in and out of the canal until it is a system on a computer. passively inserted and removed. Then the post pattern is placed into the canal and the core is added. The post Background of invention and core pattern is attached to the scanning ring of the CAD system, and then scanning and milling of the pat- [0002] A post and core is a dental restoration used to 15 terns is performed. Thus according to the disclosure the sufficiently build-up tooth structure for future restoration scanner of the CAD system is used to scan the shape of with a crown when there is not enough tooth structure to a custom-made plastic sample post and core for manu- properly retain the crown due to loss of tooth structure facturing the real ceramic post and core on a milling ma- to either decay or fracture. In many cases the dental root chine, so called copy milling. is removed leaving an empty root canal in the tooth. Typ- 20 [0006] The article "Primary Study of CAD/CAM for In- ically a thin rigid post (e.g. metal post) is inserted into the dividual Post and Core Restorations" by Gu et al. from root canal and this post provides retention for a "core" 2nd Meeting of IADR Pan Asian Pacific Federation and which is a build up of material that replaces the lost tooth the 1 st Meeting of IADR Asia/Pacific Region, sep 2009, structure. The post can be cemented within the root canal discloses that a pair of post and core plaster casts with and the core, which is an artificial preparation provides 25 preparations of different positions and shapes were fab- retention for the crown or coping replacing the tooth. The ricated. The plaster casts were then scanned by CGI term "post and core" is also referred to as "post-and-core" (Capture Geometrical Inside) method to acquire the 3- and "inlay core". Post and core restorations are often dimensional data. The 3-dimenisional designs of post characterised as "foundation restorations". and core restorations were then conducted in CAD/CAM [0003] In a root canal procedure the nerve of the tooth 30 software for prosthodontics, and at last the restorations is typically removed by the dentist using a dental drill, a were machined by means of rapid prototyping to convert so called endodontic procedure, leaving a bore in the the 3-dimensional data of CAD to objects of resin. Thus tooth. In many cases a special post can be provided that according to the disclosure post and core plaster casts matches the shape of the drill and after drilling the post are scanned before designing and manufacturing the real can be directly cemented in the bore. However, the tooth 35 resin post and core. root canal may have a non-regular structure and the bore [0007] Thus it remains a problem to provide a more in the tooth after removing the root is often also irregular, efficient and high quality CAD-CAM procedure for pro- but even for the regular shapes the depth of the bore may viding post and cores. be unknown. No post can thereby match the bore and a custom post must be provided. 40 Summary of the invention [0004] A typical procedure when designing a post and core is that the dentist provides an impression of the pre- [0008] Disclosed is a computer-implemented method pared tooth with the bore and possibly also adjacent teeth of designing and/or manufacturing a post and core to and sends it typically to a dental technician at a dental matcha bore of atooth, said methodcomprising thesteps laboratory. From this impression a dental model, such 45 of: as a gypsum model, can be poured, and the dental res- toration including the post and core can now be build a) obtaining at least one impression of a set of teeth from the dental model. The dental technician typically comprising a bore; builds the post and core in wax, and then performs an b) scanning the impression of the set of teeth com- investment casting, such that the real post and core is 50 prising the bore; manufactured in a suitable material, e.g. a metal alloy. c) providing a three-dimensional scan representa- [0005] The article "Fabrication of a custom-made ce- tion of the impression comprising the bore; ramic post and core using CAD-CAM technology" by d) transforming the three-dimensional scan repre- Awad et al. from J. Prosthet Dent 2007; 98; 161-162 dis- sentation to a three-dimensional positive working closes the use of CAD-CAM technology to fabricate a 55 model of the set of teeth and the bore; and custom-made ceramic post and core, which includes the e) designing a post and core model from the positive fabrication of a direct acrylic resin pattern, i.e. wax, to working model of the bore. capture the anatomy of the canal, and then the pattern 2 3 EP 2 400 919 B1 4 [0009] WO 2007/062658 discloses a computer imple- leting some of the sides, if they for instance provide shade mented method for obtaining orientation and localization or shadow for some of the teeth in the model, a base may of a dental implant comprising the step of scanning the be created for the positive virtual working model, and the impression of the bore in the jaw bone. post and core in the virtual working model may be marked [0010] FR1456600 discloses a system for manufactur- 5 and provided as a section which can be virtually removed ing a dental post by using the impression of the root canal. or taken out from the model. [0011] Thus it is an advantage that the method pro- [0014] Traditionally, due to problems of generating a vides a way of resolving the structure of a tooth bore to correct virtual 3D model from scanning a teeth impres- provide a matching post and core. Thus the method sion, impression scanning is often only a supplement to solves the problem that during conventional 3D scanning 10 the gypsum dental model. However, when designing a of a dental gypsum model with a bore it is virtually im- post and core according to the present invention, casting possible for the scanner to resolve the structure of the the dental model in e.g. gypsum may be omitted thereby narrow tooth cavity, i.e. the bore, as seen in fig. 11. Thus providing a more efficient and high quality CAD/CAM pro- traditionally it is not possible to examine the structure or cedure and reducing the risk of error. shape of the bore in the prepared tooth. This is because 15 [0015] It is an advantage that CAD/CAM technology 3D scanners for scanning, e.g.
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