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Pre-malignant lesions are difficult to treat. Even after surgical removal they tend to re-appear. Often the lesions are to large and are apparent on many sites, therefore surgical removal is not always possible. The photodynamic therapy uses a special substance, which is absorbed in cells, and thereafter activated by a defined light. The aim of this study is to compare the photodynamic therapy in potentially malignant lesions to a placebo. The investigators assume a significant better result in photodynamic therapy then treatment with a placebo.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Aminolaevulinic acid | Experimental |
| |
| Placebo | Placebo Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Aminolaevulinic acid | Other | Photodynamic therapy |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Changes in percent (%) of the initial area in mm2 assessed on recall appointment and by a blinded examiner on photographs with a caliper. | each treatment average once a week, recall after 4 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| pain due to treatment, assessed by visual analogue scale (VAS) | each treatment, average once a week |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Gabriella Dvorak, PD, DMD, MD | Medical University Vienna | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Bernhard Gottlieb University Clinic of Dentistry | Vienna | 1090 | Austria |
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| ID | Term |
|---|---|
| D007971 | Leukoplakia |
| ID | Term |
|---|---|
| D011230 | Precancerous Conditions |
| D009369 | Neoplasms |
| D020763 | Pathological Conditions, Anatomical |
| D013568 | Pathological Conditions, Signs and Symptoms |
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| ID | Term |
|---|---|
| C428044 | 5-aminolaevulinic acid-n-pentylester |
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| Methylcellulose Placebo |
| Other |
Methylcellulose |
|