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Abstrak :
Latar Belakang: Penggunaan adhesif universal sebagai sementasi pasak fiber dalam restorasi pasca endodontik populer digunakan karena sifatnya yang serbaguna sehingga dapat diaplikasikan dengan metode total-etch maupun self-etch. Namun, penelitian mengenai perbedaan push-out bond strength (PBS) antara kedua metode tersebut masih terbatas. Tujuan: Mengetahui perbedaan PBS dan failure mode antara metode total-etch dan self-etch sistem adhesif universal pada sementasi pasak fiber. Metode: Tiga puluh gigi premolar rahang bawah yang baru diekstraksi disimpan di dalam air terdeionisasi yang kemudian dilakukan pemotongan mahkota sebelum dilakukan perawatan saluran akar dan preparasi ruang pasak. Pasak kemudian disementasi dengan semen resin dualcure self-adhesive dan bahan adhesif Prime&Bond Universal (PBU). Uji PBS dilakukan untuk mengukur kekuatan ikat geser masing-masing kelompok uji. Kegagalan ikatan kemudian diobservasi menggunakan Scanning Electron Microscopy (SEM). Hasil: Kelompok self-etch memiliki kekuatan ikat yang lebih tinggi dibandingkan dengan kelompok lainnya dengan perbedaan yang bermakna (p<0.05). Tidak terdapat perbedaan kegagalan adhesif yang signifikan di antara kelompok. Kesimpulan: Metode self-etch memiliki kekuatan ikat paling baik dibandingkan dengan kelompok uji lainnya, namun tidak terdapat perbedaan failure mode pada setiap kelompok. ......Background: Universal adhesives for fiber post cementation in endodontically treated teeth have become popular in clinical dentistry as they can be applied in either total-etch or self-etch mode, due to their reduced number of application steps and versatility. However, studies regarding comparison between the two modes are limited and insufficient. Aim/Objective: The aim of the study is to analyze and compare the pushout bond strength and failure mode of the multimode universal adhesive system. Materials and Methods: Thirty freshly extracted mandibular premolars were decoronated prior to a root canal treatment (RCT) and prepared for post placement and bonded using Prime&Bond Universal (PBU). Post was then cemented using dual-cure self-adhesive resin cement. The push-out bond strength (PBS) test was performed to measure the shear bond strength using a universal testing machine (UTM). Failure mode was then observed using scanning electron microscope (SEM). Results: One-way ANOVA followed by a post-hoc Bonferroni and Independent T-Test indicated that there is significant difference (p<0.05) between the bond strength of the total- and self-etch mode of the universal adhesive system. However, no differences in failure mode are observed between groups. Conclusion: Self-etch mode is more preferable due to its higher bond strength dominated with cohesive failure indicating its success in bonding with the root canal

Abstrak :
Penelitian ini bertujuan untuk mengetahui pengaruh waktu pelapisan bahan adhesif universal sistem self-etch yang terhadap perubahan morfologis mikrostruktur dentin. Lima gigi premolar manusia yang diekstraksi diabrasi dan dihaluskan dari arah oklusal dan medial menggunakan diamond disc grit #600 dan kertas silikon karbida grit #1000, #1500 dan #2000. Bahan adhesif Single Bond Universal diaplikasikan dalam sistem self-etch pada permukaan oklusal dentin yang terbagi menjadi tiga kelompok berdasarkan waktunya yaitu selama 20 detik (n = 3), 30 detik (n = 3) dan 40 detik (n = 3). Spesimen dipolimerisasi dengan LED curing unit, iradiansi 900mW/cm² selama 10 detik. Satu spesimen yang tidak diaplikasi bahan adhesif digunakan sebagai kontrol. Pengamatan SEM dilakukan dengan perbesaran x850, x1,600 dan x3,000. Hasil menunjukkan bahwa terdapat perbedaan gambaran morfologis mikrostruktur dentin sebelum dan sesudah aplikasi bahan adhesif tetapi tidak ada perbedaan antar kelompok 20 detik, 30 detik dan 40 detik. Disimpulkan bahwa waktu pelapisan bahan adhesif tidak mempengaruhi perubahan morfologis mikrostruktur dentin. ...... The aim of this study is to evaluate the effect of bonding application time on dentin microstructure created by a universal adhesive in self-etch mode. Five extracted human premolars were sectioned and polished occlusally and medially using diamond disc grit #600 dan silicone carbide paper grit #1000, #1500 and #2000. One universal adhesive, Single Bond Universal was applied on to the occlusal surface of dentin and was divided into 3 groups based on the time: 20 s (n = 3), 30 s (n = 3) and 40 s (n = 3). Specimens were polimerized using LED curing unit, irradiance 900mW/cm² for 10 s, except for one that was left untreated as control. All specimens were observed using SEM at magnifications x850, x1,600 dan x3,000. The result showed that there were morfological differences in dentin microstructure between before and after application but none between specimen groups. It was concluded that bonding application time does not affect the morfological differences in dentin microstructure.