WO2016055890A1 - Procédé pour déterminer et dessiner la forme individuelle idéale des six dents avant supérieures - Google Patents

Procédé pour déterminer et dessiner la forme individuelle idéale des six dents avant supérieures Download PDF

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Publication number
WO2016055890A1
WO2016055890A1 PCT/IB2015/057287 IB2015057287W WO2016055890A1 WO 2016055890 A1 WO2016055890 A1 WO 2016055890A1 IB 2015057287 W IB2015057287 W IB 2015057287W WO 2016055890 A1 WO2016055890 A1 WO 2016055890A1
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WIPO (PCT)
Prior art keywords
point
line
rectangle
curve
angle
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PCT/IB2015/057287
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English (en)
Inventor
Aldo AMATO
Original Assignee
Amato Aldo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of WO2016055890A1 publication Critical patent/WO2016055890A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/08—Artificial teeth; Making same
    • A61C13/082—Cosmetic aspects, e.g. inlays; Determination of the colour
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H30/00—ICT specially adapted for the handling or processing of medical images
    • G16H30/40—ICT specially adapted for the handling or processing of medical images for processing medical images, e.g. editing
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
    • G16H50/50—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for simulation or modelling of medical disorders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/04—Measuring instruments specially adapted for dentistry

Definitions

  • the present patent concerns teeth reconstruction methods, and in particular it concerns a new method for determining and drawing the ideal individual shape of the six upper front teeth.
  • the modelling of prosthetic teeth is carried out by the dental technician based on a few points of reference on a model made of plaster or a similar material, or in some cases, but not very frequently, through the examination of a photograph of the patient, which allows the characteristics of the face to be taken in consideration.
  • Patent US8092220 concerns a method for reconstructing teeth according to which the shape and size of a tooth are determined based on the analysis of the patient's face.
  • the shape of the human upper central incisor tooth corresponds to the shape of the overturned face.
  • this concept is based on empirical considerations that for this reason are not universally valid or applicable.
  • the present invention makes it possible to provide the drawing of the ideal teeth for the patient's face, in such a way as to comply with the criteria that can be defined as "perceived aesthetic standards".
  • the present invention has the purpose to provide dentists and dental technicians with a simple and quick method that allows prosthetic teeth to be produced and manufactured also in the absence of reference points, with a natural shape and size, in harmony with the patient's face.
  • the present invention even though it makes reference to the geometric lines present in the patient's face, applies selected parameters that are properly synthesized in a single and original algorithmic method and make it possible to determine a series of ideal points for the production of a drawing reproducing, in particular, the six upper front teeth.
  • the new algorithm/method for calculating and drawing the individual shape of teeth can be used by an expert user, like for example a dentist, a dental technician or a doctor in general who must be able to transfer the algorithmic method to the required photographic images or to use software containing said algorithmic method.
  • the required photographic images are preferably the following:
  • the invention is a method for determining and drawing the ideal individual and customized shape of one or more of a patient's six upper front teeth, missing or however damaged, said method being characterized in that it comprises the following steps:
  • said points are determined taking in consideration at least the following parameters that can be obtained from the face shape reproduced on said images:
  • front facial angle obtained by setting the vertex at the level of the septal angle
  • facial inclination angle constructed by measuring the angle between the tangent to the face in its lower portion and a vertical line
  • Figure 1 shows the three images (Ml, M2, M3) used in the new method, and in particular a photographic image of a front view of the face with closed mouth (Ml), a photographic image of a front view of the smiling face with the teeth in occlusion (M2), a photographic image of a front view of the dental arches in occlusion (M3).
  • Ml photographic image of a front view of the face with closed mouth
  • M2 photographic image of a front view of the smiling face with the teeth in occlusion
  • M3 photographic image of a front view of the dental arches in occlusion
  • Figure 2 shows the reference rectangle (R) used to draw the points (A, B, C, D, E, F, G, H) and the curve (K) delineating the right central incisor tooth (SI 1).
  • Figure 3 shows the reference rectangle (R) with the first two points (A, E).
  • Figure 4 shows the image (M3) of the dental arches in occlusion, the curves delineating the six upper front teeth (SI 1, S12, S13, S21, S22, S23) and the imaginary reference line or smile line (1).
  • Figure 5 shows the construction rectangle (R) with the three points (A, E, C).
  • FIGS 6 and 7 show other steps of the construction process.
  • Figure 8 shows the front facial angle (AFF) drawn on the photographic image of a front view of the patient's face with closed mouth (Ml).
  • Figure 9 shows the facial inclination line (IF) and the facial inclination angle (AIF) drawn on the photographic image of the face, in front view, with closed mouth (Ml).
  • Figure 10 shows another step of the construction of the curve of the right upper central incisor tooth (SI 1).
  • Figures 11 and 12 show two images (M3) of the teeth in occlusion.
  • Figure 13 shows another step of the construction of the curve of the right upper central incisor tooth (Sl l).
  • Figure 14 shows the straight line (PX) joining a pupil (P) and a hypothetical interproximal contact point (X) selected by the user, drawn on the photographic image of a front view of the patient's smiling face (M2).
  • Figure 15 shows a part of the photographic image of a front view of the face with closed mouth (Ml), with the approximate curve (J) of the contour of the lower mandibular half- face and the related translated tangent (GF).
  • Figure 16 shows the tangent to the approximate curve of the contour of the lower mandibular half-face (T), drawn on the photographic image of a front view of the smiling face (M2).
  • Figure 17 shows a further construction step of the curve of the right upper central incisor tooth (S 11).
  • Figure 18 shows the photographic image of a front view of the smiling face (M2), including the construction straight line (PX) that joins the pupil (P) and the interproximal point (X) between the upper central incisor teeth (SI 1, S21).
  • Figure 19 shows the photographic image of a front view of the smiling face (M2), including the construction straight line (MG) tangent to the approximate curve of the contour of the lower mandibular half-face.
  • Figures 20 and 21 show further steps of the construction of the shape of the right upper central incisor tooth (SI 1).
  • Figures 22a and 22b respectively show the image of a front view of the dental arches in occlusion (M3) and only the right upper central incisor tooth (SI 1).
  • Figures 23, 24, 25, 26, 27, 28 show the steps of construction of the right upper lateral incisor tooth (S12).
  • Figures 29, 30, 31, 32, 33 show the steps of construction of the upper canine tooth (S13).
  • Figures 34 and 35 show a face on which the reference lines for the correction of the inclination of the teeth according to any possible asymmetry in the patient's face are drawn. DESCRIPTION OF THE METHOD
  • the calculation is started from the upper central incisor teeth (Sl l, S21), and continued with the upper lateral incisor teeth (S12, S22) and the upper canine teeth (SI 3, S23).
  • the rectangle has known height (RH) and width (RL), obtained through other rules or other software, or arbitrarily introduced by the user at his/her own discretion, provided that they respect a predefined height/width proportion ratio.
  • the base of the rectangle (point E) is then positioned at the level of the smile line or imaginary harmonious line or reference line (1) drawn by the user, which passes through the incisal edges (S3) of the upper teeth (Sl l, S21) and the cusps (S4) of the canine (S13, S23) and bicuspid teeth.
  • Said imaginary line (1) is a convex curve with approximately the same curvature as the lower lip when smiling (see Figure 4).
  • o A is at the centre of the upper side of the rectangle (R);
  • o the rectangle is high H11C and wide F11C, wherein RH is the height of the tooth and RF is the front width.
  • Said data are determined arbitrarily or through data obtained from other known methods. For example, it is possible to arbitrarily set the RL/RH ratio so that it is included between 0.6 and 0.9;
  • o E is at the centre of the lower side of the rectangle (R);
  • o B is an arbitrary point.
  • the height of the crown HI 1C* is defined as HCC.
  • o G is on the distal segment at a statistical distance HI 1C (statistical data) from the upper segment;
  • H is given by the intersection between the distal segment of the angle AFF, the straight line IF (angle AIF) and the straight line PSL parallel to the smile line (1) of the half-arch, previously calculated by the user ( Figure 7).
  • the angle AFF is calculated by transferring the patient's facial angle ( Figure 8) on the rectangle that has been created, positioning the vertex in point A. First the facial inclination line (IF) is drawn, then the segment of angle AFF is intersected with it. Then the line parallel to the smile line (1) is drawn.
  • the angle AIF is constructed by measuring the angle between the tangent to the face (between zygion and gonion) and the vertical line ( Figure 9).
  • o H is re-determined in HI through the intersection between the straight line passing through G with inclination AIF and the smile line (1) passing through Bl; o calculation of the vertical distance between HI and B 1 ;
  • o Al is determined by shifting A by Delta x ( ⁇ ) distally on the upper segment ( Figure 13);
  • o D is determined as follows: in the photographic image of the smiling face with closed teeth (M2), measurement of the inclination of the straight lines passing through the point of intersection between the vertical line joining the pupils (P) and the superciliary ridge (horizontal glabella) and the hypothetical point (X) of interproximal contact between the upper central incisor teeth (SI 1, S21) decided by the user ( Figure 14).
  • Point D is obtained by translating the line MG to point G and making it intersect the lower segment of the rectangle.
  • ⁇ a vertex (F) is the point of intersection between the straight line passing through G with inclination equal to that of the tangent to the curve of the jaw (line G-F) and the lower segment of the rectangle
  • ⁇ a vertex (Fl) is the point of intersection between the straight line passing through G with inclination equal to that of the straight line MG ( menton - point G);
  • the calculation of the successive teeth is based on the central incisor teeth (Sl l, S21) as points of reference, and on already known points.
  • the angle AFF is equal to that used for the central incisor teeth (SI 1, S21), but it is reduced according to a perspective calculation based on the distance of the observer and the curvature of the dental arch.
  • the height is arbitrary or is obtained from available data.
  • the vertical position of the rectangle with respect to the central incisor tooth is defined in relation to the position of point C, which remains fixed;
  • o point C is known, as it coincides with point G of the central incisor tooth (SI 1); o point A is arbitrary but is determined according to the height;
  • o point B is situated on line PSL that is parallel to the smile line (1).
  • o A is initially positioned at the centre of the upper segment of the rectangle
  • o E is initially positioned at the centre of the lower segment of the rectangle
  • o C is positioned on the mesial segment, at a distance HCC (h-13%) from the upper segment.
  • the rectangle is positioned vertically in such a way that point C of tooth S12 (S12.C) corresponds to point G of tooth Sl l (l l .G) (two crossed data 11G and HCC). Said correspondence of the points is approximate between the two data (weighted average).
  • the correspondence of point C of S12 and G of SI 1 makes it possible to obtain the rectangle in which tooth S12 is inscribed.
  • Point B is positioned at the height corresponding to point H of Sl l, while B.x is undetermined, for the moment ( Figure 24).
  • Point C is located at 30% of the measure of point hcc/2 of SI 1 or S21 ( Figure 25).
  • o FT is determined by the point of intersection between the line passing through G with inclination AIF and the smile line passing through Bl; o calculation of the vertical distance between the new H and Bl (Delta);
  • o A' is determined by shifting A distally by Delta, on the upper segment.
  • a vertex is C; the two lines mentioned above are drawn from C and the two vertices lie on the lower segment of the rectangle;
  • o point D is the point nearest to E (based on the tangent G-F to the j aw); the other point is called Dl;
  • o point F is the nearest to E (based on the tangent G-F to the j aw); the other point is called Fl;
  • o A is initially positioned at the centre of the upper segment of the rectangle
  • o E is positioned at the level of the smile line (Figure 29);
  • o C is positioned on the mesial segment, at the level of 12. G;
  • o point B is positioned at the level of point H of S12, B.x is undetermined for the moment.
  • o G is positioned at the distance 20% of HCC 11 from point B ( Figure 30)
  • o point G is in turn shifted along the line parallel to the smile line (weighted average);
  • o FT is determined by the intersection of the straight line passing through G with inclination AIF with the smile line passing through Bl;
  • o A' is determined by shifting A by Delta distally on the upper segment.
  • a vertex is C; the two straight lines (ND, GF) mentioned above are drawn from point C and the two vertices are on the lower segment of the rectangle;
  • o point D is the nearest to E (based on the tangent G-F to the j aw); the other point is called Dl;
  • a vertex is G; the two straight lines mentioned above are drawn from C and the two vertices are on the lower segment of the rectangle;
  • o point F is the nearest to E (based on the tangent G-F to the j aw); the other point is called Fl;
  • the procedure is identical and specular for the right side of the face.
  • the angle x is the individual axial inclination of each one of the front teeth of the upper jaw. In front view, the zenith of each ideal tooth must be contained within the line corresponding to the tooth.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Primary Health Care (AREA)
  • Dentistry (AREA)
  • Databases & Information Systems (AREA)
  • Radiology & Medical Imaging (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Pathology (AREA)
  • Data Mining & Analysis (AREA)
  • Biomedical Technology (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

L'invention concerne un procédé permettant de déterminer et de dessiner la forme idéale et personnalisée d'une ou de plusieurs des six dents avant supérieures d'un patient. Le procédé utilise une ou plusieurs images du visage du patient dans une vue avant et au moins une image des dents avant en occlusion ; en outre, il utilise des paramètres qui peuvent être obtenus à partir de la forme du visage lorsqu'elle est reproduite sur lesdites images pour déterminer n points de référence, le périmètre de la dent étant obtenu en dessinant une courbe approximative reliant lesdits points.
PCT/IB2015/057287 2014-10-06 2015-09-22 Procédé pour déterminer et dessiner la forme individuelle idéale des six dents avant supérieures WO2016055890A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2014A000258 2014-10-06
ITPD20140258 2014-10-06

Publications (1)

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WO2016055890A1 true WO2016055890A1 (fr) 2016-04-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600083061A1 (it) * 2016-08-05 2018-02-05 Aldo Amato Metodo per determinare e disegnare la forma ideale individuale dei due denti frontali superiori
IT201700078609A1 (it) * 2017-07-13 2019-01-13 Luca Levrini Metodo integrativo per la visualizzazione combinata dei risultati occlusali ed estetici del viso dopo trattamento ortodontico

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008077508A1 (fr) * 2006-12-21 2008-07-03 Manfred Wiedmann Procédé de reconstruction de dents
WO2011062473A1 (fr) * 2009-11-17 2011-05-26 Universiti Malaya Procédé de régression pour modéliser des largueurs de dents
WO2012000511A1 (fr) * 2010-06-29 2012-01-05 3Shape A/S Agencement d'image 2d

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008077508A1 (fr) * 2006-12-21 2008-07-03 Manfred Wiedmann Procédé de reconstruction de dents
US8092220B2 (en) 2006-12-21 2012-01-10 Manfred Wiedmann Method for reconstruction of teeth
WO2011062473A1 (fr) * 2009-11-17 2011-05-26 Universiti Malaya Procédé de régression pour modéliser des largueurs de dents
WO2012000511A1 (fr) * 2010-06-29 2012-01-05 3Shape A/S Agencement d'image 2d

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WILLIAMS J.L., A NEW CLASSIFICATION OF HUMAN TOOTHFORMS, 1920

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600083061A1 (it) * 2016-08-05 2018-02-05 Aldo Amato Metodo per determinare e disegnare la forma ideale individuale dei due denti frontali superiori
WO2018025251A3 (fr) * 2016-08-05 2018-04-05 Amato Aldo Méthode de détermination et de traçage de la forme individuelle idéale des deux dents avant supérieures
US11278380B2 (en) 2016-08-05 2022-03-22 Aldo Amato Method for determining and drawing the ideal individual shape of the upper front teeth
IT201700078609A1 (it) * 2017-07-13 2019-01-13 Luca Levrini Metodo integrativo per la visualizzazione combinata dei risultati occlusali ed estetici del viso dopo trattamento ortodontico

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