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US 2017/0360536 A1Published application
Method for producing a ceramic fixed partial denture
OwnerFiras Khalid ALQARAWIinventor
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Abstract
A method for making ceramic fixed partial dentures comprising separating the as-sintered partial denture structure, rejoining the retainers and pontic with glass, which forms a strong joint between the retainers and pontic after sintering. This method may produce ceramic long-span fixed partial dentures with a better fit.
Claims19
1:
- A method for forming a fixed partial denture, comprising:
- milling a porous ceramic block into a shape of a series of teeth thereby forming a pre-sintered framework structure comprising:
- a plurality of retainers;
- and
- a pontic located between and connected to adjacent retainers via a connector;
- sintering the pre-sintered framework structure thereby forming an initial sintered framework structure;
- separating the initial sintered framework structure at the connector thereby providing a plurality of sintered retainers and a sintered pontic;
- seating each sintered retainer and aligning the sintered pontic on a respective tooth abutment within a patient's mouth or on a dental model so as to provide an accurate fit;
- and
- rejoining each sintered retainer to the sintered pontic thereby forming a final framework structure and sintering to form the fixed partial denture.
7 more elements
2:
- The method of claim 1, wherein the porous ceramic block comprises porous pre-sintered zirconia.
3:
- The method of claim 2, wherein the porous ceramic block further comprises yttrium oxide.
4:
- The method of claim 1, wherein at least one of the pre-sintered framework structure and the final framework structure is sintered in a pressure ranging from 1-50 mbar.
5:
- The method of claim 1, wherein at least one of the pre-sintered framework structure and the final framework structure is sintered at a temperature ranging from 900° C. to 1500° C.
6:
- The method of claim 5, wherein at least one of the pre-sintered framework structure and the final framework structure is sintered at a temperature ranging from 1000° C. to 1200° C.
7:
- The method of claim 1, wherein at least one of the pre-sintered framework structure and the final framework structure is sintered for a period ranging from 1-60 minutes.
8:
- The method of claim 7, wherein at least one of the pre-sintered framework structure and the final framework structure is sintered for a period ranging from 5-10 minutes.
9:
- The method of claim 1, wherein the initial sintered framework structure is separated by ultrasonic vibration-assisted machining, laser-assisted machining, or thermal-assisted machining.
10:
- The method of claim 9, wherein the initial sintered framework structure is separated by laser-assisted machining.
11:
- The method of claim 1, wherein the initial sintered framework structure is separated by ultrasonic vibration-assisted machining, laser-assisted machining, or thermal-assisted machining, and the method further comprises separating the initial sintered framework structure with a machining tool heated to a temperature up to 500° C.
12:
- The method of claim 1, wherein the accurate fit is provided by seating each sintered retainer and aligning the sintered pontic on the respective tooth abutment within the patient's mouth.
13:
- The method of claim 1, wherein the accurate fit is provided by seating each sintered retainer and aligning the sintered pontic on the respective tooth abutment of the dental model.
14:
- The method of claim 1, wherein each sintered retainer is rejoined to the sintered pontic by applying a glass therebetween.
15:
- The method of claim 14, wherein the glass is in the form of a paste.
16:
- The method of claim 1, wherein the fixed partial denture comprises:
- at least 90% ZrO2 by weight;
- at least 3% Y2O3 by weight;
- at least 1% HfO2 by weight;
- no more than 0.1% Al2O3 by weight;
- no more than 0.1% SiO2 by weight;
- and
- no more than 0.1% Na2O by weight of the fixed partial denture.
5 more elements
17:
- A fixed partial denture, comprising:
- at least 90% ZrO2 by weight;
- at least 3% Y2O3 by weight;
- at least 1% HfO2 by weight;
- no more than 0.1% Al2O3 by weight;
- no more than 0.1% SiO2 by weight;
- and
- no more than 0.1% Na2O by weight of the fixed partial denture;
- wherein the fixed partial denture is in the form of a plurality of retainers and a pontic located between and connected to adjacent retainers via a connector and which does not have a porcelain veneer.
6 more elements
18:
- The fixed partial denture of claim 17, comprising:
- 91-94% ZrO2 by weight;
- 4-6% Y2O3 by weight;
- 2-4% HfO2 by weight;
- no more than 0.1% Al2O3 by weight;
- no more than 0.1% SiO2 by weight;
- and
- no more than 0.1% Na2O by weight of the fixed partial denture.
5 more elements
19:
- The fixed partial denture of claim 17, which has a failure load in a range of 200-700 N.