6. Responses to biologic width violation
2 responses :
- gingival inflammation only
- gingival recession with bone loss
thin,fragile,highly scalloped gingiva ~ more chances of
gingival recession
thin alveolar housing ~ horizontal bone loss
thick alveolar housing ~ vertical bone loss
7.
8.
9. Correcting biologic width violation
- 2 options
Surgery
Orthodontic extrusion
- surgery ~ more rapid, bone removed away from margin
by measured distance of ideal biological width for that patient
+ additional 5mm for ‘ferrule’ effect
- interproximal violation ~ surgery contraindiated
- orthodontic extrusion ~ interproximal violations
2 types ;
- low orthodontic extrusion force ~ bone & gingiva follows
~osseous contouring
- rapid orthodontic extrusion force with supracrestal
fibrotomy~ gingival inflammaton ~ bone does not follow
10.
11. Crown lengthening procedures & biologic width
- short clinical forms
- retention & resistance form
- extention of caries
Methods
- removal of soft tissue only ~ adequate attached gingiva &
> 3mm of tissue coronal to the bone crest or
- removal of both soft tissue and alveolar bone ~ inadequate
attached gingiva & < 3mm of tissue coronal to bone crest
- gingivectomy or flap technique
- subgingival extention of caries ~ additional 1mm of bone
removed to provide ‘ferrule’ effect
12. Conclusion
The average biological width is 2.04mm considering the
variations which may occur in each person. This concept
establishes a healthy state of the periodontium and any
violations to it, by procedures like clinical crown
13. lengthening, inadverent placement of margins of restoration
breaching the attachment apparatus, will hinder the healthy
state of the periodontium resulting in periodontal problems as
has been mentioned. Thus it is essential to properly evaluate
the biologic width of the particular case and preserve this entity
before and while performing such treatment modalities.
References
Clinical Periodontology by Carranza
www.wikipedia.com
Stomatologija,Baltic Dental & Maxillofacial Journal,2006
www.pubmed.com