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[Three-dimensional model analysis of the gingival sulcus width from different retraction time]
Jin jing Zhang1, Yu hua Liu, Pei jun Lv
1Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Summary
Gingival retraction time impacts sulcus width, with 10 minutes recommended for single-cord techniques. Optimal retraction varies by gingival area, measurable with 3D analysis.
Area of Science:
- Dental materials science
- Periodontology
- Biomechanical analysis
Context:
- Accurate dental impressions are crucial for prosthodontic restorations.
- Gingival retraction is a standard procedure to expose the sulcus for impression taking.
- The duration and location of gingival retraction can influence sulcus width and impression quality.
Purpose:
- To investigate the relationship between gingival retraction duration and gingival sulcus width.
- To compare the effects of different retraction times (5, 10, 15 minutes) on sulcus width in various gingival areas.
- To evaluate the utility of three-dimensional (3D) model analysis for assessing gingival retraction outcomes.
Summary:
- A study using 3D model analysis on 46 premolars found significant differences in gingival sulcus width between 5 and 10-minute retraction times at midbuccal and transitional line angle (TLA) areas.
- At TLA areas, a statistically significant difference was observed between 10 and 15-minute retraction times.
- Midbuccal areas consistently showed greater sulcus widths than TLA areas across all retraction times.
Impact:
- Results suggest a minimum gingival retraction time of 10 minutes for single-cord mechanical techniques before making impressions.
- The study highlights that optimal retraction time and sulcus enlargement vary depending on the specific gingival area.
- Three-dimensional model analysis is validated as an objective method for evaluating the effectiveness of gingival retraction based on time and location.
