Microcirculation of the marginal periodontium in the manufacture of artificial crowns with different levels of location of the boundaries of the preparation
Relevance. Margin line of preparated tooth may be located on different height above gingival level, during prothetic treatment. Preparation below gingival level is always traumatic that effects on microcirculation of gingiva.Purpose. To estimate the time of normalization of periodontal microcirculation with different location margin line above gingival level.Materials and methods. We selected 3 groups of 30 patients who had their teeth prepared for full artificial crowns with making circular 135 degrees’ chamfer: on the level gingival margin, below the level of the gingival margin, and with surgical correction of the gingival margin. The microcirculation of the marginal periodontium was estimated by using laser Doppler flowmetry before preparation and at various times after.Results. In group 1 and 2 the normalization of hemodynamic parameters occurred in 21 days after preparation, and in group 3 - after 6 months.Conclusion. Taking into account the results we can suggest the optimal time for getting working impressions: when preparing teeth without surgical correction of the gingival margin - in 21 days, and with gingivectomy - after 6 months.