Ischemia
Conditions
Brief summary
Apply the LASCA for follow-up the postocclusive microcirculation after strangulation of the gingiva in order to characterize the kinetics of the blood flow changes in human subjects.
Detailed description
During surgical endodontics the cortical bone is exposed by elevating a full- thickness tissue flap. Cutting across mucosal blood vessels disturbs perfusion and causes ischemia. On the other hand, preserving sufficient blood flow of the soft tissue segment is important for the postoperative wound healing. In order to minimize the damage of the microvasculature of the operated area, the incision should be properly designed. The investigators will model surgical incisions by strangulation of the gingiva of healthy human subjects based on the commonly applied endodontic incision such as horizontal, vertical and papilla base. The primary aim is to determine the effect of a short term disruption of the blood flow at the respective region on the surrounding area in order to assess the functionally active collateral circulation. Using Laser Speckle Contrast Analysis (LASCA), which provides blood perfusion data, the investigators will have the possibility to detect functional alterations in gingival microcirculation during and after a short term of strangulation. The secondary aim is to assess the time course of the restoration of the circulation on the affected area.
Interventions
PROCEDUREstrangulation
The strangulation is applied on the attached gingiva with an angulated manual instrument. The force of the occlusion is standardized by a calibrated spring connecting the head with the handle of the tool. The head is overlaid onto the gingiva covering 10mm long and 1mm width surface. The amount of the applied pressure is 100 gram.
Sponsors
Semmelweis University
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
20 Years to 45 Years
Healthy volunteers
Yes
Inclusion criteria
* general good health
Exclusion criteria
* pregnancy * smoking * general diseases * medicine taking except contraceptives
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from baseline in blood flow during and after ischemia | baseline, at time of strangulation, and 30 second, 5,10,15,20 minute post-occlusal | The blood flow changes are measured by Laser Speckle Contrast Analyzer (LASCA) before (baseline), during and after strangulation. The scale is an arbitrary unit (0-3000 LSPU) and the relative changes to the baseline measurement will be calculate. The blood flow is recorded for 30min. |
Outcome results
None listed