Final answer:
The underlay technique used in Myringoplasty is the overlay technique. It involves placing a graft beneath the eardrum remnants to repair a perforation. This is in contrast to the butterfly technique, where the graft is not placed beneath the annular ring.
Step-by-step explanation:
The underlay technique used in Myringoplasty is the overlay technique. Myringoplasty is a surgical procedure aimed at repairing a perforation in the tympanic membrane, also known as the eardrum. The overlay technique involves lifting the annulus and a portion of the ear canal skin to place the graft material underneath it, directly onto the remnants of the tympanic membrane, which facilitates healing and closure of the perforation.
The underlay technique is preferred by many surgeons due to its effectiveness in promoting graft uptake and its ability to improve the structural integrity of the tympanic membrane. The graft material, commonly taken from a vein or fascia, is positioned beneath the remnants of the eardrum and the annular ring. This technique contrasts with the butterfly technique, in which a graft is folded like a butterfly's wings and introduced through the perforation without lifting the annulus.