US4961707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guided periodontal tissue regeneration
Assignee: University of Florida
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Filing: 1989-06-06
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Granted: 1990-10-09
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Expires: 2009-06-06
Abstract
Abstract A method and surgical implant article for enhancing the regeneration of periodontal connective tissue at tooth root surfaces exposed by periodontal surgery wherein the exposed root surfaces are covered with a surgical implant article which is a membrane which excludes contact between the root surfaces and gingival epithelium and gingival connective tissue but permits migration to the root surfaces of PDL cells, the membrane being constructed of a non-toxic, nonimmunogenic, bio-absorbable material.
Inventors
- 👤 Ingvar Magnusson
- 👤 Christopher Batich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:01
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0003; A61C8/0004; A61C8/0006; A61K; A61K6/00; A61K6/50; Y; Y10; Y10S; Y10S128/00; Y10S128/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A method of enhancing the regeneration of periodontal connective tissue at root surfaces exposed by peridontal surgery comprising covering said exposed root surfaces with a membrane which excludes contact between said root surfaces and gingival epithelium and gingival connective tissues and permits migration to said root surfaces of PDL cells after surgery, said membrane having pores therein of a size of from about 10μ to about 500μ and a thickness of from about 50 μ to about 200μ and being constructed substantially of a non-toxic, non-immunogenic, bio-absorbable material.
Claim 2
Independent Claim
88 words
A method of enhancing the regeneration of periodontal connective tissue at root surfaces exposed by peridontal surgery comprising covering said exposed root surfaces with a membrane which excludes contact between said root surfaces and gingival epithelium and gingival connective tissues and permits migration to said root surfaces of PDL cells after surgery, said membrane having pores therein of a size of from about 10μ to about 500μ and a thickness of from about 50 μ to about 200μ and being constructed substantially of a non-toxic, non-immunogenic, bio-absorbable material.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said material is polylactic acid or a copolymer of lactic acid with a member selected from the group consisting of glycolic acid, hexamethylsebacic acid, caprolactone and hydroxybutyrate.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein said material is polylactic acid.
Claim 5
Dependent Claim
22 words
The method of claim 2 wherein said material is a copolymer of lactic acid and glycolic acid, hexamethylsabacic acid, caprolactone or hydroxybutyrate.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein said material is collagen.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein said material is polycaprolactone, polyglycolic acid, a polyanhydride, polydioxanone, or a polyamino acid.
Claim 8
Dependent Claim
16 words
The method of claim 1 wherein said material additionally contains an effective amount of a plasticizer.
Claim 9
Dependent Claim
24 words
The method of claim 1 wherein said material additionally contains an effective amount of an antibiotic, calcification inhibitor or periodontal ligament cell growth factor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |