Biologic Width & Emergence Profile

BIOLOGIC WIDTH &

EMERGENCE PROFILE

GUIDED BYDR. ASHISH KHASBAGE MDS DR.SIDDHARTH Y.GOSAVI MDS DR.SULEKHA S. GOSAVI MDS DR.SAILENDRA SAHU MDS

PRESENTED BY R.SHUBHA RAO FINAL YEAR

INTRODUCTION

To maintain or enhance the patient’s esthetic appearance,

the tooth/tissue interface must present a healthy natural appearance with gingival tissue framing the restored teeth in a harmonious manner.

Consideration regarding periodontal restorative interrelationship

BIOLOGIC CONSIDERATI

ON

ESTHETIC CONSIDERATI

ON

OCCLUSAL CONSIDERATI

ON

SPECIAL CONSIDERATI

ON

BIOLOGIC CONSIDERATION

MARGIN PLACEMENT & BIOLOGIC WIDTH

BIOLOGIC WIDTH:-DEFINITION-

“IT IS THE DISTANCE BETWEEN GINGIVAL MARGIN AND THE BASE OF THE POCKET.”

MARGIN PLACEMENT

There are 3 options:-

Supragingival position

Sub gingival position

Equigingival position

Restorative consideration frequently dictate the placement of restoration margins beneath the gingival tissue crest. Restoration may need to be extend gingivally -

To create adequate resistance and retentive form in the perpotion.

To make significant contour alterations because of caries and other tooth deficiency.

To mask the tooth/restoration interface by locating it subgingivally.

If margin is too far from crestbone loss Tissue Recession

In deep margin placement –bone level appears to remain unchanged. but gingival inflammation develops and persist.

Evaluation of Biologic Width

Radiographic ally interpretation can identify interproximal violation of biologic width.But more common location is mesio-fascial & distofascial line angle of teeth which cannot be diagnosed because of superimposition.An other method for accessing the width clinically by measuring the distance between bone and restoration margin using a periodontal probe. The anaesthetized attachment tissue from the sulcus to underlying bone

The biologic width or attached width can be identified for each individual patient by probing under anesthesia to the bone level and then subtracting the sulcus depth from the resulting measurement .This measurement must be performed on teeth with healthy gingival tissue and should be repeated on one or more teeth to ensure an accurate assessment.Such information is then used to definitively diagnose biologic width violation, the extent of correction needed and the parameters for placement of future restoration.

Correction of Biologic Width

Biologic width violation can be corrected either :-

surgically

orthodontic ally

Crown lengthening procedure

It is done to achieve an effective increase in crown length by gingivectomy or by removal of gingiva by electosurgery.

There is also osseous recountouring is most often needed to prevent encroachment of the prosthesis on biologic width

For this procedure full thickness flap is reflected and the osseous resection creates 3.5-4.0mm between gingival crest and the margin of the existing restoration or carious lesion.

There are some factors which should be considered during the procedure

Esthetic- when surgically crown lengthening

procedure is indicated it may be difficult to achieve a harmonious transition from the tissue around the lengthened tooth to that around adjacent teeth. if surgery is under taken most of osseous reduction should be on the lingual or palatal side where there is usually no esthetic problem with blending on the labial or buccal side only as necessary

Root length within bone-if there is limited osseous support it may better to remove the tooth and replace it with prosthesis than to have the patient undergo surgery on a tooth with a doubtful prognosis .

Effect on adjacent teeth – often a fracture or defect on such depth cannot be eliminated without severely endangering the adjacent teeth

Root furcation espouser in a posterior teeth-in this situation cannot be remedied by osteoplasty and /or odontoplasty. the tooth may require removal.

Mobility-post surgical mobility of a tooth with small or conical root is a valid concern. if such tooth cannot support it self or cannot be supported by the adjacent teeth, removal may be necessary.

Extent of the defect-the severity and complication of any fracture, root caries or cervical wear must be carefully evaluated during the treatment planning phase.

Root perforation-this is uncommon but if it occur during endodontic therapy it’s location determines whether to remove the tooth Orthodontically extruded or lengthen the root surgically

Thickness of soft tissue –in some instance thick gingival tissue may effect a regrowth of tissue in a coronal direction .an increased removal of osseous support may be needed at the time of crown lengthening surgery to regret this potential problem

2. Orthodontic Extrusion When all tooth structure has been lost to the level of

the alveolar crest or beyond , because of either fracture or caries, the tooth cannot be satisfactorily resorted without some extraordinary measure.

Even if dowel core is placed in the tooth ,the root will remain susceptible to fracture with out crown encircling the tooth apical to the core.

This ferrule effect around the tooth protect it from fracture by the dowel from within.

If tooth structure is lost only to the level of the epithelial attachment, minor extrusion may be desirable to permit access to enough tooth structure apical to the finish line to produce a ferrule effect.

Orthodontic extrusion has been used to move solid root structure in to accessible area

Orthodontic brackets has been described for this purpose

But there are some disadvantages :-

Bulky and unaesthetic. Difficult to place apically. Unwanted movement of the abutment.

High degree of patient compliance.

Margin placement guidelineThe first is using sulcus in depth as a guide in margin

placement is to manage gingival healthThen following 3 rules can be used to place

intracreviular margins:-RULE I:if the sulcus probe 1.5mm or less, place the

margin 0.5mm below the gingival tissue crest.

RULE II: If sulcus probe more than 1.5mm, place the margin half the depth of the sulcus below the tissue crest.

RULEIII: If a sulcus grater than 2mm is found especially fascial aspect of the tooth ,evaluate to see if a gingivectomy could be performed to lengthen the tooth and creates a 1.5mm sulcus. Then patient is treated using rule 1.

Provisional Restoration Three critical areas must be managed

to produce favorable biologic response to provisional restoration-

Marginal fit Contour Surface finish of the interim

restorations must be appropriate to maintain the health and position of the gingival tissues during the time interval until the final restoration are delivered

Poorly adapted restoration at the margins, are over or under contoured and have rough or porous surface can cause inflammation ,overgrowth or recession of gingival tissues

Marginal Fit Marginal fit has been implicated in producing an inflammatory response in the periodontium .It has been seen that level of gingival inflammation can increase, corresponding with the level of marginal opening. Open margins are capable of harboring large number of bacteria and may be responsible for inflammatory response.

Crown contourRestoration contour has been

described as extremely important to maintenance periodontal health.

Ideal contour provides access for hygiene and has the fullness to create the desired gingival form and a pleasing visual tooth contour in esthetic areas

Most frequent cause is inadequate tooth preparation.

In areas where esthetic are not critical, a flatter contour is always acceptable.

Sub gingival Debris

Leaving debris below the tissue during restorative procedure can create an adverse periodontal response.

Cause can be :-Retraction cordImpression materialProvisional materialTemporary or permanent restoration

Hypersensitivity to dental material

Inflammatory response have been reported related to the use of nonprecious alloy in the dental restoration. The response have occurred to alloys containing nickel.

More importantly tissue respond more to the differences in the surface roughness of the material rather than composition of material.

Rougher the surface of the restoration subgingivally, the grater are the plaque accumulation and gingival inflammation.

In clinical research, porcelain, highly polished gold, and highly polished resin

Emergency profile The part of the axial contour that

extends from the base of the gingival sulcus past the free gingiva has been described as the emergence profile.

Given by “STEIN & KUWATA”. It extends to the height of contour

producing a straight profile in the, gingival third of the axial surface.

Production of a straight profile should be a treatment objective in restoring a tooth, because it facilitates access for oral hygiene measures

Straight profile is easily evaluated with a periodontal probe.

The most common error relating to axial contour is the creation of a bulge or excessive convexity.

According to PARKINSON:- FACIOLINUAL

WIDTH METAL CERAMIC CROWNS >0.71mm FULL GOLD CROWN 0.36mmIf over contoured restoration with large

convexity causes accumulation of food debris and plaque, and which causes gingival inflammation.