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Abstrak :
ABSTRAK
Latar Belakang: siler polidimetilsiloksan merupakan siler baru yang berpotensi menutup saluran akar lebih baik. Tujuan: membandingkan tingkat kerapatan pengisian di sepertiga apeks antara teknik kon tunggal (KT) dan downpackbackfill (DB) menggunakan siler polidimetilsiloksan. Metode: empat puluh gigi premolar bawah dibagi menjadi dua kelompok KT dan DB. Setelah pengisian saluran akar, sampel diinkubasi, dilapisi cat kuku, direndam dalam tinta India, lalu dibuat transparan dengan metode Robertson. Kebocoran di sepertiga apeks dievaluasi dengan mikroskop stereo. Hasil: skor kebocoran terendah (0-0,5 mm) dimiliki oleh kelompok KT dan skor kebocoran tertinggi (>1 mm) dimiliki oleh kelompok DB. Kesimpulan: teknik kon tunggal memberikan tingkat kerapatan yang lebih baik dibandingkan downpack-backfill, walaupun secara statistik perbedaan antar keduanya tidak signifikan. ABSTRACT
Background: polydimethylsiloxane sealer is a brand new sealer that potentially has a better sealing ability to the root canal. Aim: to compare the apical sealing ability in one third apex between single cone (SC) and downpack-backfill (DB) technique using polydimethylsiloxane sealer. Methods: fourty extracted human manibular premolars devided into two group, SC and DB. After obturated with polydimethylsiloxane sealer, samples were stored in incubator, coated with nail varnish, immersed in India ink, and then specimens were cleared using Robertson?s technique. The apical dye penetration was evaluated using a stereomicroscope. Result: the lowest leakage score (0-0,5 mm) was found in SC group and the highest score(>1 mm) in DB group. Summary: single cone technique exibited better sealing ability rather than downpack-backfill technique, although no statistical significant difference between this two techniques. ;Background: polydimethylsiloxane sealer is a brand new sealer that potentially has a better sealing ability to the root canal. Aim: to compare the apical sealing ability in one third apex between single cone (SC) and downpack-backfill (DB) technique using polydimethylsiloxane sealer. Methods: fourty extracted human manibular premolars devided into two group, SC and DB. After obturated with polydimethylsiloxane sealer, samples were stored in incubator, coated with nail varnish, immersed in India ink, and then specimens were cleared using Robertson?s technique. The apical dye penetration was evaluated using a stereomicroscope. Result: the lowest leakage score (0-0,5 mm) was found in SC group and the highest score(>1 mm) in DB group. Summary: single cone technique exibited better sealing ability rather than downpack-backfill technique, although no statistical significant difference between this two techniques. ;Background: polydimethylsiloxane sealer is a brand new sealer that potentially has a better sealing ability to the root canal. Aim: to compare the apical sealing ability in one third apex between single cone (SC) and downpack-backfill (DB) technique using polydimethylsiloxane sealer. Methods: fourty extracted human manibular premolars devided into two group, SC and DB. After obturated with polydimethylsiloxane sealer, samples were stored in incubator, coated with nail varnish, immersed in India ink, and then specimens were cleared using Robertson?s technique. The apical dye penetration was evaluated using a stereomicroscope. Result: the lowest leakage score (0-0,5 mm) was found in SC group and the highest score(>1 mm) in DB group. Summary: single cone technique exibited better sealing ability rather than downpack-backfill technique, although no statistical significant difference between this two techniques.

Abstrak :
ABSTRAK
Latar Belakang: Penggunaan gutaperca yang dipanaskan menghasilkan adaptasi yang baik dan material obturasi yang homogen. Teknik kompaksi lateral panas menggabungkan kon gutaperca utama dan aksesoris menjadi satu massa homogen yang solid. Teknik carrier-based gutta-percha memiliki seal dan adaptasi yang baik. Teknik downpack-backfill mengkombinasikan teknik kompaksi vertikal dan injeksi termoplastis. Tujuan: Membandingkan adaptasi tepi sepertiga apikal apeks antara teknik kompaksi lateral panas, carrier-based gutta-percha, dan downpack-backfill. Metode: Preparasi saluran akar pada 90 gigi saluran akar tunggal dan dibagi menjadi tiga kelompok, yaitu kompaksi lateral panas (KLP), carrier-based gutta-percha (T), dan downpack-backfill (DB). Adaptasi tepi sepertiga apikal apeks ditentukan dengan melihat penetrasi pewarna di antara material obturasi dan dinding dentin pada sampel yang dipotong melintang. Hasil: Adaptasi tepi sepertiga apikal apeks DB paling baik, diikuti T dan KLP (p>0,05). Kesimpulan: Adaptasi tepi sepertiga apikal apeks teknik downpack-backfill paling baik, namun tidak berbeda bermakna.

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ABSTRACT
Background: The use of heated gutta-percha can provide good adaptation and homogeneity of obturation material. Warm lateral compaction technique combines primary and accessory gutta-percha cones into one solid homogeneous mass. Carrier-based gutta-percha technique has a good adaptation and sealing ability. Downpack-backfill technique combines warm vertical compaction and thermoplastic injection techniques. Aim: Compare the apical third marginal adaptation of warm lateral compaction, carrier-based gutta-percha, and downpack-backfill techniques. Methods: Ninety single rooted teeth were prepared and assigned to three groups: warm lateral compaction (KLP), carrier-based gutta-percha (T), and downpack-backfill (DB). Apical third marginal adaptation was evaluated by observing the dye penetration between the obturation material and the root canal walls on cross sectioned samples. Results: DB showed the best apical third marginal adaptation, followed by T and KLP (p>0,05). Conclusion: Downpack-backfill technique has the best apical third marginal adaptation, but no significant difference was observed between the three techniques.