root conditioning agents

By,T.MYTHREYEE

ROOT CONDITIONING AGENTS

Periodontium-Gingiva,Alveolar bone,Periodontal ligament,Cementum.

Periodontal diseases-main etiological agent-’’BACTERIA’’.

On the root surface bacteria are mostly gram –ve bacteria.

These bacteria in the cementum of teeth with untreated periodontal disease

Endotoxins(have potent inflammatory agents)

Prevent the growth of FIBROBLASTS and are CYTOTOXIC.

These changes create obstacle to new ATTACHMENT.

So the root must be cleaned of cementum bound endotoxins.

In vitro mechanical removal of cementum is possible and showed new growth of cells(Aleo,et al 1975;Cogen et al 1983,1984)

ATTACHMENT LOSS

Root planing removes diseased cementum but it produces a ‘’smear layer’’.

In vivo total removal of cementum is not possible and trace amounts of endotoxins are left behind(JONES and O’HEARY,1978).

TOPICAL CHEMOTHERAPUTIC AGENTS:for detoxification and enhancement of new attachment in:

Cosmetic gingival reconstruction(Miller,1985)

Bone augmentation(Yukna,1980)Overcome rapid rate of epithelial

proliferation down along the root.

Use of acids-1st reported in NEWYORK DENTAL RECORD in 1846,later YOUNGER(1893)

Several substances have been used for ROOT CONDITIONING-

These include Citric acid,Fibronectin,Tetracycline.

CITRIC ACIDStudies by Urist

showed formation of new bone or cementum on partially or totally demineralised dentin matrix or allogenic bone.

pH-1.0-1.4Application time-

2or 3 min.

MODE OF ACTIONRemoval of smear layer formed after root

planing

This creates a mat like collagen surface with exposed dentinal tubules

PDL cells and gingival FIBROBLASTS adhere better to demineralized root surface.

CITRIC ACID MECHANISM FOR GAINING ROOT COVERAGEEXPOSED ROOT SURFACE

CITRIC ACID Ph 1.0

4microns DEMINERALIZED SURFACE EXPOSED COLLAGEN FIBRILS +EXPOSED COLLAGEN FIBRILS OF FLAP OR GRAFT.

PLASMA FIBRONECTIN FACTOR,FACTOR 13

FIBRIN COVALENT LINKAGE

COLLAGEN FIBRILS OF ROOT

NEWLY SYNTHESIZED COLLAGEN FIBERS

COLLAGEN FIBRILS OF GRAFT

ACTIONSAccelerated healing and new cementum

formation.No significant action on non-root planed

roots,after root planing-4mm deep demineralized zone is created.

Antibacterial effect.(Daly,1982)Root detoxification(Aleo et al,1975)Prevents migration of epithelium .Enhanced fibroblast growth and

stability(Boyko et al ,1980)Attachment by direct linkage.

TECHNIQUE OF APPLICATION

TETRACYCLINE HCLActions-• Antibacterial,expos

ure of root collagen and opening of the dentinal tubules

DemineralizationDetoxificationAttachment by

direct linkage

Other advantages

DISADVANTAGESRequires high concentrations(>0-5%)Longer application times(>5min)Not so effective as CA in root

demineralization and removal of smear layer.

No human histologic or clinical studies show +ve results as CA.

FIBRONECTINIt is a glycoprotein that fibroblasts require

to attach to root surfaces.Addition of fibronectin-promotes new

attachment.Fibronectin-fibrin sealing system helps in

healing of PERIODONTAL SURGICAL WOUNDS

Commercially available in Europe as ‘’TISSUCOL’’.

ACTIONSEnhances the effect of demineralization

with regard to new attachmentEnhances cell proliferation from PDL and

SUPRACRESTAL areaConc-0.38/ml saline,has also been used as

a substitute for suturesChemotactic effect on fibroblasts and

mesenchymal cells.

APPLICATIONSCOSMETIC GINGIVAL RECONSTRUCTIONPRIOR TO PLACEMENT OF BONE IMPLANTSINFRABONY DEFECTSIMPLANT ADDITIVE(TTC)PRIMARY TREATMENT FOR CL2

FURCATIONS.

CONCLUSIONAlthough not yet fully supported by

research on humans,CA and TTC have significant benefits that cannot be achieved by scaling and root planing alone.

In future they may provide a surface substrate for use of’’ PROTEIN MODIFIERS’’.

Note:’’SYNTHETIC BIOLOGIC PROTEIN MODIFIERS’’-artificially stimulate tissue regeneration.

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