Perbandingan kecepatan penutupan ruang pencabutan gigi premolar pertama rahang bawah antarasistem ligasi konvensional dan sistem self ligating pasif menggunakan closed coil spring uji klinis = A comparison of the rate en masse space closure using conventional and pasif self ligating brackets using closed coil spring - Irma Tarmizi, author (Fakultas Kedokteran Gigi Universitas Indonesia, 2013)