The approximate time in which ferric sulphate dampened in a cotton pellet is put to the root stump while performing pulpotomy is
**Core Concept**
Pulpotomy is a dental procedure where a portion of the pulp is removed to preserve the vitality of the remaining pulp tissue. Ferric sulphate is used as a medicament to induce hemorrhage and promote the formation of a hard tissue barrier at the site of injury.
**Why the Correct Answer is Right**
The use of ferric sulphate in pulpotomy involves the application of a cotton pellet soaked in the medicament to the root stump. The ferric sulphate induces hemorrhage by releasing iron ions, which bind to the sulfates and cause the formation of ferric sulfate ions. These ions then react with the hemoglobin in the blood vessels, leading to vasoconstriction and a reduction in blood flow. This process helps to promote the formation of a hard tissue barrier at the site of injury, which is essential for the success of the pulpotomy procedure. The correct time frame for applying the ferric sulphate is crucial to avoid over- or under-treatment.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is too short a time frame for the ferric sulphate to take effect.
**Option B:** This option is incorrect as it is too long a time frame for the ferric sulphate to remain effective.
**Option C:** This option is incorrect as it is not a commonly recommended time frame for the application of ferric sulphate in pulpotomy.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the time frame for applying ferric sulphate in pulpotomy can vary depending on the specific clinical scenario. However, a general guideline is to apply the medicament for 1-2 minutes to achieve the desired effect.
**Correct Answer: C. 1-2 minutes**