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   2013| September-December  | Volume 1 | Issue 3  
    Online since September 25, 2013

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Antimicrobial effect of different xylitol concentrations on Streptococcus mutans and Lactobacillus acidophilus count
S Radmerikhi, B Formantes, KR Fajardo, E Azul
September-December 2013, 1(3):95-98
In recent years, pentacarbon sugars including xylitol are employed as supplements in the preparation of oral health products. The main purpose of this study was to measure Streptococcus mutans and Lactobacillus acidophilus count treated with different xylitol concentrations. Bacterial solutions were mixed separately in to 2 M (30.43%) xylitol stock solution. The mixture provided bacterial growth medium with 3-18% of xylitol. The solutions stored in a 37°C incubator for 48 h. Initial optical density and optical density of samples after 48 h taken using spectrophotometer. Result shown in average, bacterial growth in L. acidophilus was higher than S. mutans and even in higher xylitol concentration this difference preserved. The present study indicates that the addition of xylitol drastically can enhance the effect of antibacterial agent.
  3 7,405 837
Push-out bond strength of fiber posts luted using different adhesive resin cements
Suat Özcan, Serkan Aktuna, Yelda Nayir, Darendeliler Yaman, Oya Bala
September-December 2013, 1(3):75-80
Background: Post retention to root canal dentin is an important problem that directly affects the success of the restoration. The aim of this study was to evaluate the influence of different adhesive resin cements on the bond strength of fiber posts to root canal dentin. Materials and Methods: A total of 44 human mandibular premolars were selected for the study. Posts were luted using four different resin cements: Group 1; RelyX Unicem, Group 2; Panavia F 2.0, Group 3; Kerr Maxcem and Group 4; Clearfil self-adhesive (SA) cement. After the cementation, three segments per tooth were obtained starting 1 mm below the cementoenamel junction including, cervical, middle and apical. The roots were sectioned into 6 slices of 1 mm thickness each. Push-out test was performed using the universal testing machine at a cross-head speed of 0.5 mm/min. Statistical analysis was performed using one-way ANOVA and Tukey's tests (α = 0.05). Results: Mean push-out bond strengths were: RelyX Unicem (22.4 ± 2.46), Panavia F 2.0 (19.8 ± 2.01), Kerr Maxcem (18.1 ± 2.45), Clearfil SA Cement (23.8 ± 2.49). Clearfil SA Cement showed significantly higher bonds strength than the other tested materials except RelyX Unicem (P < 0.05). Conclusion: SA 10-methacryloyloxydecyl dihydrogen phosphate-based resin cements yielded higher bond strength values than did self-etch or SA resin cements for fiber posts in push out tests. Bond strength values were higher in coronal than in the middle and apical root sections.
  2 2,365 305
Advances in Restorative Dentistry
Hakan Çolak
September-December 2013, 1(3):99-100
  - 614 193
Different treatment approaches in a multiple dental traumatic injury
Kürsat Er, Bora Bagis, Tamer Tasdemir, Kadir Tolga Ceyhanli
September-December 2013, 1(3):90-94
This case report describes the management of crown- and root-fractured maxillary and mandibular anterior permanent teeth in a 22-year-old patient because of a bicycle accident. Six teeth (11, 21, 22, 23, 31, and 32) of patient were affected by trauma. A nonsurgical endodontic treatment was performed to coronal root fragments of teeth 11, 21, and 22. The coronal parts of the canals were filled with mineral trioxide aggregate (MTA). These teeth were restored with a fiber-reinforced hybrid composite resin bridge. Other root-fractured teeth 23 and 32 were healed spontaneously. The tooth 31 with complicated crown-fractured was prepared and filled with gutta-percha and sealer. After, a glass-fiber post was applied, the restoration of this tooth was performed a hybrid composite resin using an incremental technique. The teeth were in function with satisfactory clinical and radiographic results after 24-month. Healing was achieved without any need for further endodontic surgical intervention. This case shows that traumatized teeth can be managed with endodontic and prosthetic treatments, which can result in satisfactory periradicular healing.
  - 3,659 494
Helping our patients overcome their fear of the dentist
James K Bahcall
September-December 2013, 1(3):73-74
  - 1,925 3,840
Microtensile bond strength of three adhesive systems to different dentin tissues
Bilinç Bulucu, Cemal Yesilyurt, Davut Çelik, Gunes Bulut Eyuboglu, Cemile Kedici Alp, Hikmet Aydemir
September-December 2013, 1(3):81-85
Purpose: The aim of this in vitro study was to determine the micro-tensile bond strengths (mTBS) of three adhesive systems (Prime&Bond NT, Clearfil SE Bond, G Bond) to four different dentin structures; bovine dentin and unerupted, sound, caries affected human dentins. Materials and Methods: Flat bovine molar, unerupted, sound and caries affected human molar dentin structures were obtained at the occlusal surfaces of the extracted teeth. Final surface grindings were performed using 600-grit Silicon carbide paper. Three adhesive systems (Prime&Bond NT, Clearfil SE Bond, G Bond) were used to bond composite resin (P60, 3M ESPE) to the prepared dentin surfaces. After 24 h distilled-water storage, the bonded specimens were cross-sectioned (0.8 ± 0.2 mm 2 ) and subjected to a (μTBS) test. One-way analysis of variance multiple comparison test were used to statistically analyze the mean bond strength data α =0.05. Results: There was statistically significant difference in mTBS among the dentin types (P < 0.0005). Mean bond strength to sound human and bovine dentin was significantly higher than to caries-affected dentin and dentin of unerupted human teeth (P < 0.05). Statistically similar bond strength was obtained with Prime&Bond NT and Clearfil SE Bond while G-Bond showed the lowest bond strengths. Conclusion: The type of dentin structure has an important effect on the mTBS values of adhesive systems.
  - 5,304 494
Effect of endodontic irrigants on microtensile bond strength of a self-etching adhesive system
Abdulkadir Sengun, Hasan Orucoglu, Hayriye Esra Ülker
September-December 2013, 1(3):86-89
Aim: The aim of this in vitro study was to evaluate the effect of two different irrigation solutions, alone or in combination, with different application times on the dentin bond strength of a self-etching adhesive. Materials and Methods: Twenty-eight extracted non-carious human third molars were randomly distributed into seven groups according to the irrigant. The crowns of the molars were sectioned vertically through bucco-lingual direction. Solutions of 5% sodium-hypochlorite (NaOCl), 3% hydrogen-peroxide (H 2 O 2 ), and a combination of NaOCl and H 2 O 2 were applied to the dentin surface for various lengths of time. The adhesive system (Clearfil SE Bond; Kuraray, Japan) was applied according to the manufacturers' directions and then the dentin surfaces were built up with a hybrid composite resin (Clearfil AP-X Kuraray, Japan). Specimens were sectioned into 15 sticks; each of them had a 0.65 mm 2 bonding area. Microtensile bond strength was determined (MPa), and the results were statistically analyzed using one-way ANOVA and Tukey's HSD test. Results: Irrigation with NaOCl alone showed similar micro-tensile bond strength values with the control group (P > 0.05). In comparison to control group, irrigation with H 2 O 2 alone for 5 min and 30 min and the irrigation with H 2 O 2 /NaOCl combination each for 15 min decreased the microtensile bond strength. Conclusion: The use of H 2 O 2 significantly reduced the bond strengths of the self-etching adhesive when applied alone or in combination with NaOCl for a long time.
  - 2,296 338