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"Latar Belakang: Kegagalan perawatan saluran akar dapat terjadi walaupun perawatan saluran akar mempunyai tingkat keberhasilan yang tinggi. Salah satu pilihan perawatan untuk kasus kegagalan adalah perawatan non bedah. Pembuangan bahan pengisi saluran akar merupakan faktor penting yang menentukan keberhasilan perawatan saluran akar ulang.  Tujuan: Menganalisis perbedaan kebersihan pembuangan bahan pengisi dengan menggunakan instrumen putar tenaga mesin yang bergerak rotasi kontinu (ProTaper Universal Retreatment System [Dentsply Maillefer]) dan resiprokal (Reciproc® Blue [VDW,Munich]). Metode: 42 premolar rahang bawah pasca pengisian saluran akar dibagi 2 kelompok (n = 21): kelompok 1: R25 (sistem resiprok). kelompok 2: ProTaper Universal Retreatment System (sistem rotasi kontinu). Sampel dipindai dengan Micro Computed Tomography,data direkonstruksi dan dianalisis dengan perangkat lunak CTAnalyser (Bruker). Dihitung volume sisa bahan pengisi. Hasil yang didapat dibandingkan dengan uji Mann-Whitney (p<0,05). Hasil : Masih terdapat bahan pengisi pada seluruh sampel. Secara statistik, terdapat perbedaan bermakna pada volume sisa bahan pengisi dari kedua kelompok. Kesimpulan : Instrumen gerak resiprokal membuang lebih banyak bahan pengisi dari saluran akar terutama area 1/3 apikal  dibandingkan instrumen gerak rotasi kontinu.

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Background: Despite having a high success rate, failure in endodontic treatment can still occur. One of the treatment options for failure cases is non surgical retreatment. Maximum removal of root canal filling material is essential for successful endodontic retreatment. Objective: To analyze the difference in cleaning of root canal filling by using continuous rotary motion (ProTaper Universal Retreatment System) and reciprocating motion (Reciproc® Blue [VDW, Munich]). Methodolgy: 42 mandibular premolars post-endodontic treatment divided into 2 groups (n = 21): group 1: R25 (reciprocating system). group 2: ProTaper Universal Retreatment System (continuous rotary system). Samples were scanned with Micro Computed Tomography, data reconstructed and analyzed by CTAnalyser (Bruker). Volume of residual filling material were calculated. The results were compared with Mann-Whitney test (p <0.05). Results: All teeth examined had filling remnants within the canal. Statistically, there were significant differences in residual volume of filling material from both groups. Conclusion: The reciprocal motion instrument removes more filling material from the root canal, especially at the 1/3 apical area than the continuous rotary motion instrument."

"Latar Belakang: Ketika perawatan saluran akar gagal, perawatan ulang saluran akar nonbedah, sedapat mungkin, adalah pilihan klinis pertama. Material pengisi saluran akar sebelumnya harus dibuang untuk kemudian dilakukan desinfeksi dan pengisian ulang saluran akar. Terdapat berbagai teknik pembuangan material pengisi, termasuk metode heat carrier, instrumen manual, putar, ultrasonik dan pelarut, atau kombinasi. Penghilangan sepenuhnya material pengisi tidak dapat dilakukan dengan hampir sebagian besar material yang tersisa dari perawatan ulang adalah siler. Siler biokeramik berikatan secara kimiawi dengan membentuk hidroksiapatit dan berpenetrasi ke tubulus dentin untuk menciptakan ikatan mikromekanis. Hal ini membuat pembersihan siler biokeramik sulit dilakukan. Tujuan: Mengevaluasi kebersihan saluran akar dengan berbagai metode pembuangan siler biokeramik menggunakan instrumen putar, kombinasi instrumen putarultrasonik, dan kombinasi instrumen putar-heat carrier pasca obturasi dengan teknik hidraulik dan WVC, yang dianalisis menggunakan Micro-CT. Metode: Empat puluh dua sampel gigi premolar rahang bawah pasca ekstraksi dengan akar lurus dan saluran akar tunggal yang diobturasi dengan siler biokeramik AH Plus® Bioceramic (Dentsply, USA) meggunakan dua teknik, hidraulik dan WVC. Pembuangan material pengisi menggunakan instrumen putar, kombinasi instrumen putar-ultrasonik, dan kombinasi instrumen putar-heat carrier. Pemindaian micro-CT setelah obturasi dan setelah pembuangan material dan dianalisis menggunakan perangkat lunak CTAn. Hasil: Terdapat perbedaan persentase kebersihan saluran akar (p<0,05) yang bermakna antara metode instrumen putar, kombinasi instrumen putar-ultrasonik, dan kombinasi instrumen putar-heat carrier. Kesimpulan: Pembuangan siler biokeramik menggunakan kombinasi instrumen putar-ultrasonik lebih efektif dibandingkan metode instrumen putar dan metode kombinasi instrumen putar-heat carrier. Teknik obturasi tidak mempengaruhi kebersihan saluran akar.

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Background: When root canal treatment fails, non-surgical retreatment, if possible, is the first clinical choice. Previous root canal filling materials must be removed for subsequent disinfection and obturation of the root canal. There are various techniques for removing filling materials, including heat carrier methods, manual instruments, rotary, ultrasonic and solvent, or combinations thereof. Complete removal of filling materials cannot be achieved with almost all remaining materials from retreatment being sealer. Bioceramic sealers chemically bond by forming hydroxyapatite and penetrate into dentin tubules to create micromechanical bonds. This makes cleaning of bioceramic sealer difficult. Objective: To evaluate the cleanliness of root canal walls in retreatment with various methods of removing bioceramic sealer using rotary instruments, combination of rotary-ultrasonic instruments, and combination of rotary-heat carrier instruments postobturation with hydraulic and WVC techniques, analyzed using Micro-CT. Methods: Forty-two extracted mandibular premolar samples with straight roots and single root canals obturated with AH Plus® Bioceramic sealer (Dentsply, USA) using two techniques, hydraulic and WVC. Removal of filling material using rotary instruments, combination of rotary-ultrasonic instruments, and combination of rotary-heat carrier instruments. Micro-CT scanning after obturation and after removal of material and analyzed using CTAn software. Results: There is a significant difference (p<0.05) in the percentage of root canal cleanliness between the rotary instrument, the combination with ultrasonic, and the combination with heat carrier.Conclusion: Bioceramic sealer removal methods using a combination of rotary-ultrasonic instruments are more effective than rotary instrument methods and combination of rotary-heat carrier methods. The obturation technique does not affect the cleanliness of root canal."

"Indonesian Journal of Dentistry 2006; Edisi Khusus KPPIKG XIV: 74-78The failure of endodontic treatment is commonly caused by errors in preoperative, operative and postoperative endodontic treatment. Inadequate final restoration of post-endodontic treatment would impact the success of the treatment. Loose restoration is an example of restoration failure caused by inadequate retention which leads to penetration of saliva along the root canal.This could dissolve the luting cement and cause microleakage to constantly reach the periradicular areas. lf neglecled, this situation will result in a periradicular lesion. Endodontic retreatment was performed to resolve the failing restoration. The restoration failed due to inadequate retention. The treatment was needed to prevent more problems to occur sometime in the future."