Accurate analogs for prostheses using computer generated anatomical models

• US 20080124676A1
• Filed: 10/10/2007
• Published: 05/29/2008
• Est. Priority Date: 08/31/2001
• Status: Active Grant

• Current Assignee: CLM Analogs LLC
• Original Assignee: Leonard Marotta
• Inventors: Marotta, Leonard
• Granted Patent: US 7,887,327 B2
• Time in Patent Office: Days
• US Class Current: 433/174
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts
• CPC Class Codes: A61C 1/084 of implanting tools
• CPC Class Codes: A61C 13/0004 Computer-assisted sizing or machining of dental prostheses
• CPC Class Codes: A61C 8/0001 Impression means for implants, e.g. impression coping
• CPC Class Codes: A61C 8/0096 Implants for use in orthodontic treatment
• CPC Class Codes: A61C 8/0098 Immediate loaded implants
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G16H 20/40 relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Abstract

Pre-surgical planning for cranial and facial reconstruction includes preparing a computer generated jaw or skull model for determining a locational position for a dental implant, a surgical bone implant to repair missing bone in the cranium, install ear prostheses, and/or install nose prostheses. The computer generated jaw or skull model is made from medical imagery and computer aided design. A surgical guide is prepared with oversize holes in registration with analogs for the dental or surgical bone implants to be inserted at the locational positions determined by a dentist or surgeon in the jaw or cranial skull model. The surgical guide is fitted atop each analog, and the surgical guide is bonded to the jaw or skull model at a predetermined angle of the analog in the jaw or skull. The surgical guide is removed from the model attached to the law or skull of a patient for accurate drilling during the dental or surgical procedure for insertion of the implants into the jaw or skull of the patient.

Claims

1. An anchored anti-rotation analog post for preparing a dental crown for insertion into the mouth of patient, said analog post comprising:

an elongated pin having opposite top and bottom ends;

said pin having at least one anti-rotation anchoring projection extending discretely and radially from said pin adjacent said bottom end thereof;

said at least one anchoring projection comprising a fixed wing along an outer surface of said pin and extending up from the bottom end of said pin.

2. The analog post of claim 1 wherein said fixed wing comprises a rod extending less that a full length of said pin.

3. The analog post of claim 2 in which said rod is textured on an outer surface thereof.

4. The analog post of claim 2 in which said rod has an axially extending groove in an outer surface thereof.

5. The analog post of claim 1 wherein said pin has a pair of wings on opposite sides of said pin.

6. The analog post of claim 1 wherein said pin has multiple wings spaced along and around the outer surface of said pin.

7. The analog post of claim 6 wherein said wings comprise rods extending less that a full length of said pin.

8. A method of preparing dental crowns efficiently and accurately, comprising the steps of:

a. preparing an analog for a jaw implant supporting a dental crown mounting pin having at least one anti-rotation anchoring projection extending discretely and radially from said pin adjacent a bottom end thereof;

b. inserting bottom-end-down said prepared mounting pin into a dental crown casting mold;

c. securing said prepared mounting pin temporarily in place within said casting mold;

d. adding settable plastic molding material to said casting mold so as to embed said bottom end of said pin by surrounding said bottom end of said pin with said plastic molding material;

e. allowing said plastic molding material to set and harden with said prepared pin embedded within said molding material; and

f. utilizing said embedded mounting pin to make a dental crown.

9. The method of claim 8 wherein said fixed wing comprises a rod extending less that a full length of said pin.

10. The method of claim 9 in which said rod is textured on an outer surface thereof.

11. The method of claim 9 in which said rod has an axially extending groove in an outer surface thereof.

12. The method of claim 8 wherein said pin has a pair of wings on opposite sides of said pin.

13. The method of claim 8 wherein said pin has multiple wings spaced along and around the outer surface of said pin.

14. The method of claim 13 wherein said wings comprise rods extending less that a full length of said pin.

15. A method of preparing dental prosthesis efficiently and accurately using digital and CT Scan imagery to produce a computer generated resin model of a patient'"'"'s jaw, wherein the improvement comprises the steps of:

a. determining a location and position and angle orientation of at least one implant post in a patient'"'"'s jaw by utilizing the computer generated resin model;

b. marking said locational position and orienting angle at an edge surface of the stereolithographic resin model;

c. drilling a hole at said marked locational position at said orientation angle into the computer generated resin model of the patient'"'"'s jaw;

d. preparing an anchored anti-rotation analog post for a dental prosthesis for insertion into the mouth of patient, said analog post comprising;

an elongated pin having opposite top and bottom ends;

said pin having at least one anti-rotation anchoring projection extending discretely and radially from said pin adjacent said bottom end thereof;

said at least one anchoring projection comprising a fixed wing along an outer surface of said pin and extending up from the bottom end of said pin.

e. inserting said anti-rotation analog post into the drilled hole of the computer generated resin model of the patient'"'"'s jaw;

f. forming a surgical guide over said hole, wherein said surgical guide includes a computer conforming to the teeth and outer jaw surface of a portion of the jaw for accepting the implant post;

g. drilling holes in the surgical guide conforming to the predetermined location and angle orientation of the implant, and

h. placing the surgical guide in the patient'"'"'s mouth and drilling holes for acceptance of the implant in the patient'"'"'s jaw.

16. The method of preparing dental prostheses of claim 15 wherein said fixed wing comprises a rod extending less that a full length of said pin.

17. The method of preparing dental prostheses of claim 16 in which said rod is textured on an outer surface thereof.

18. The method of preparing dental prostheses of claim 16 in which said rod has an axially extending groove in an outer surface thereof.

19. The method of preparing dental prostheses of claim 15 wherein said pin has a pair of wings on opposite sides of said pin.

20. The method of preparing dental prostheses of claim 15 wherein said pin has multiple wings spaced along and around the outer surface of said pin.

21. The method of preparing dental prostheses of claim 20 wherein said wings comprise rods extending less that a full length of said pin.

26. The method of forming a dental prostheses as in claim 15 wherein said surgical guide is thermally formed on a top of said implant location of the model engaging the teeth or ridge surface with a close fit for transferring the analog positions accurately.

27. The method for forming a dental prostheses as in claim 15 wherein a computer generated surgical guides which fits onto the jaw model is used.

28. The method for forming a dental prostheses as in claim 15 further comprising the step of bonding surgical sleeves at the appropriate angle at the analog location onto the surgical guide.

29. The method of forming a dental prostheses as in claim 15 wherein the surgical guide is snapped off at least one of the respective teeth and the respective ridge surface of the jaw model and is transferred to the patient'"'"'s mouth and snapped onto at least one of the respective actual teeth and the respective ridge surface, thereby providing accurate guides for drilling at least one hole for at least one actual implant, while at a remote lab, a respective tooth crown prosthesis is being fabricated using said at least one analog inserted in the jaw model.

30. The method of making a dental prostheses as in claim 15 wherein said surgical guide comprises an assembly of:

a surgical guide sleeve supported by a form-fitting cylinder support mount,

a tube adapter to adjust the height of said guide sleeve above the analog, and

a screw threaded through the three parts from the top to secure the said surgical guide assembly to said analog below.

22. The method for making dental prostheses wherein said computer generated model is produced by the fabrication of a solid object by at least one additive method selected from the group consisting of stereolithography, laminated object manufacturing, solid freeform fabrication, and fused deposition modeling.

23. The method for making dental prostheses as in claim 22 wherein said computer generated model is determined by computer CAD design.

24. The method for making dental prostheses as in claim 22 wherein said computer generated model is determined by medical images.

25. The method for making dental prostheses as in claim 24 wherein said medical images are selected from the group consisting of x-rays, sonograms, CT Scans, nuclear imaging and magnetic resonance MRI imaging.

31. A method for pre-surgical planning for cranial and facial reconstruction comprising the steps of:

a. preparing a computer generated skull model;

b. determining a locational position for a surgical bone implant to repair missing bone in the cranium, install ear prostheses, and/or install nose prostheses;

c. using the computer generated skull model and preparing a surgical guide with oversize holes in registration with analogs for the surgical bone implants to be inserted at the locational positions determined by a surgeon on the skull model;

d. fitting said surgical guide atop each analog, and bonding said surgical guide to the skull model at a predetermined angle of the analog in the skull, and

e. removing said surgical guide attached for accurate drilling during the surgical procedure for insertion of the implants onto the skull of patient.

32. The method for pre-surgical planning for cranial and facial reconstruction as in claim 31 wherein said surgical guide comprises an assembly of:

a surgical guide sleeve supported by a form-fitting cylinder support mount,

a tube adapter to adjust the height of said guide sleeve above the analog, and

a screw threaded through the three parts from the top to secure the said surgical guide assembly to said analog below.

33. The method for pre-surgical planning for cranial and facial reconstruction as in claim 31 wherein said computer generated model is produced by the fabrication of a solid object by at least one additive method selected from the group consisting of stereolithography, laminated object manufacturing, solid freeform fabrication, and fused deposition modeling.

34. The method for pre-surgical planning for cranial and facial reconstruction as in claim 31 wherein said computer generated model is determined by computer CAD design.

35. The for pre-surgical planning for cranial and facial reconstruction as in claim 31 wherein said computer generated model is determined by medical images.

36. The method for pre-surgical planning for cranial and facial reconstruction as in claim 35 wherein said medical images are selected from the group consisting of x-rays, sonograms, CT Scans, nuclear imaging and magnetic resonance MRI imaging.