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Akilesh Ramasamy writes "Critical sulcus WIDTH-0.2 mm ..lateral displacement less than this value results in increased incidence of voids in impression.
The critical position of PREPARED CERVICAL MARGIN-0.5mm from healthy free gingical margin or 0.3- 0.4 mm from alveolar crest.
RULES OF THREE IN GINGIVAL DISPLACEMENT…..
3 causes of difficulties in gingival displacement
1. inflamed gingival tissues
2. inadequate attached gingival
3. the too deep location of prepared cervical margin in the sulcus"
