Pengaruh konsentrasi asam fosfat terhadap kekuatan perekatan semen ionomer kaca modifikasi resin dengan polimerasi sinar tampak :: Uji Laboratoris kekuatan geser pada braket keramik dan banyaknya sisa bahan perekat

SYAHRUL, Dwis, Dr. Pinandi Sri Pudyani, drg.,SU.,Sp.Ort

2003 | Tesis | S2 Ilmu Kedokteran Gigi

Tujuan penelitian in-vitro ini adalah untuk mengetahui pengaruh konsentrasi asam fosfat terhadap kekuatan geser perekatan braket keramik pada email dan banyaknya sisa bahan perekat di permukaan email setelah uji kekuatan geser. Dua puluh delapan gigi Premolar pertama rahang atas manusia bekas pencabutan dibagi menjadi 4 kelompok. Kelompok A (kontrol) dietsa asam poliakrilat 10%, B dietsa asam fosfat 5%, C dietsa asam fosfat 10% dan D dietsa asam fosfat 35%. Permukaan bukal gigi dietsa selama 15 detik kemudian braket keramik (Illusion PlusTM, Ortho Organizers) direkatkan dengan perekat Fuji OrthoTM LC. Setelah direndam di dalam air selama 24 jam, gaya geser dikenakan pada bagian oklusal braket dengan arah sejajar dasar braket. Hasil penelitian menunjukkan bahwa rerata kekuatan geser setelah dietsa asam poliakrilat 10% (41,60 kg/cm2) lebih rendah secara bermakna dibandingkan dengan kelompok lainnya (p<0,05) ataupun lebih rendah dari pada kebutuhan perekatan di klinik ortodonsia (60-80 kg/cm2). Rerata kekuatan geser setelah dietsa asam fosfat 35% (198,68 kg/cm2) lebih tinggi secara bermakna dari pada kelompok lainnya (p<0,05). Rerata kekuatan geser setelah dietsa asam fosfat 5% (77,37 kg/cm2) sesuai dengan kebutuhan di klinik ortodonsia. Pengamatan banyaknya sisa bahan perekat di permukaan email dengan Adhesive Remnant Index (ARI) menunjukkan bahwa setelah dietsa asam fosfat 5% lebih kecil dari pada setelah dietsa asam fosfat 10% ataupun 35%. Disimpulkan bahwa asam fosfat konsentrasi 5%, 10%, 35% sebagai bahan etsa email berpengaruh terhadap kekuatan geser perekatan braket keramik pada email. Asam fosfat dengan konsentrasi 5% sudah dapat digunakan sebagai bahan etsa email dalam perekatan braket keramik, tetapi kekuatan geser perekatan tertinggi didapatkan setelah dietsa asam fosfat 35%. Terdapat perbedaan banyaknya sisa bahan perekat di permukaan email setelah dietsa asam fosfat 5%, 10%, 35% setelah uji kekuatan geser. Terdapat sedikit sisa bahan perekat di permukaan email setelah dietsa asam fosfat 5%.

The purpose of this in vitro study was to determine the effect of phosphoric acid concentrations on the shear bond strength of ceramic brackets to enamel and the amount of adhesive left on enamel surface after debonding. Twenty eight extracted human upper first maxillary premolars were divided into four groups. Group A (control) was etched by 10% polyacrylic acid, B was etched by 5% phosphoric acid, C was etched by 10% phosphoric acid and D was etched by 35% phosphoric acid. The buccal surfaces of the teeth were etched for 15 seconds, and ceramic brackets (Illusion PlusTM, Ortho Organizers) were bonded with Fuji OrthoTM LC adhesive. Teeth were immersed in water for 24 hours. Shear force was applied to the occlusal bracket in the direction parallelly to the bracket base. Results showed that the mean of shear bond strength after etched by 10% polyacrylic acid (41.60 kg/cm2) was significantly lower than the other groups (<0.05) or than the clinical orthodontic requirement (60-80 kg/cm2). The mean of shear bond strength after etched by 35% phosphoric acid (198.68 kg/cm2) was significantly higher than the other groups (<0.05). The mean of shear bond strength after etched by 5% phosphoric acid (77.37 kg/cm2) was appropriate to the clinical orthodontic requirement. The assessment of the Adhesive Remnant Index (ARI) showed that the amount of adhesive left on enamel surface after debonding was smaller after etched by 5% phosphoric acid than 10% or 35% phosphoric acid’s. It was concluded that 5%, 10%, 35% phosphoric acid concentrations used for etching enamel effected the shear bond strength of ceramic brackets to enamel. The 5% phosphoric acid concentration was appropriate for bonding of ceramic brackets, but the higher shear bond strength was 35% phosphoric acid etched. There was a difference on the adhesive, left on enamel surface after debonding that was etched by 5%, 10%, 35% phosphoric acid’s. There was a small amount adhesive left on enamel surface that was etched by 5% phosphoric acid.

Kata Kunci : Gigi,Asam Fosfat, Kekuatan Perekatan, Permukaan Email, Phosphoric Acid - Ceramic Bracket Shear Bond Strength - Enamel Surface.