<unk>  is a phonosurgical technique designed to improve the voice by altering the thyroid cartilage of the larynx (the voice box), which houses the vocal cords in order to change the position or the length of the vocal cords.
Thyroplasty
Parathyroidectomy
Thyrotomy
Thyroidectomy
Pyrotherapy
Glossectomy
Hypophysectomy
Crown lengthening