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   2015| January-April  | Volume 3 | Issue 1  
    Online since January 27, 2015

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Effect of coronal cement base and its thickness on the fracture resistance of endodontically treated teeth
Cihan Yildirim, Ugur Aydin, Abdul Semih Ozsevik, Fatih Aksoy, Samet Tosun
January-April 2015, 3(1):8-13
Objective: To compare the fracture resistance of endodontically treated teeth with mesiodistocclusal (MOD) cavities restored with only composite resin, 3 mm glass-ionomer cement (GIC) base + composite resin, and 5 mm GIC base + composite resin. Materials and Methods: Fifty extracted intact mandibular molars were randomly divided into five groups each including 10 teeth. Group 1: No cavity preparation or endodontic treatment was applied (intact teeth). Group 2-5: Root canals were prepared with step-back technique and filled lateral condensation of gutta-percha and sealer. Group 2: No coronal restoration was achieved. Group 3: Teeth were coronally restored with only composite resin. Group 4: Coronal restorations were performed with composite resin following 3 mm GIC base placement. Group 5: Composite resin placed over 5 mm GIC base. After finishing and polishing, all specimens were kept in an incubator at 37°C in 100% humidity for 24 h and fracture resistance was tested with a Universal Testing Machine. Mean force load for each sample was recorded in Newtons (N). Results were statistically analyzed with one-way analysis of variance (ANOVA) and post-hoc Tukey's tests. Results: The mean force required to fracture each sample was as follows: Group 1: 2,745.3; Group 2: 325.9; Group 3: 1,958.1; Group 4: 1,756.3; and Group 5: 1,889.1. Fracture resistance of intact teeth (Group 1) was significantly higher than all other groups. Fracture resistance of teeth in Group 2 (not coronally restored) was significantly lower than all other groups. Fracture resistance values of other three experimental groups (Groups 3, 4, and 5) were not significantly different from each other. Conclusion: Placing a GIC base and its thickness did not significantly affect the fracture resistance compared with composite resin alone.
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Radicular dentinal defects incidence after using EDTA gel with different root canal instrumentation techniques
Mohamed Abdel Aziz Mohamed El Sayed, Maryam Omar Al amoud, Malak Rashid M'gharfaoui
January-April 2015, 3(1):21-25
Objectives: The purpose of this study was to compare the incidence of dentinal defect formation after using EDTA gel during root canal preparations by three different instrumentation techniques. Materials and Methods: One hundred and forty maxillary central incisors were decoronated and roots were embedded in resin blocks. Twenty samples were left unprepared (Control group), and the remaining 120 samples were divided into three groups. Each group was divided equally into two subgroups according to the use of EDTA gel during root canal instrumentation. Roots were prepared with hand file (Group 1), ProTaper Universal (Group 2) and WaveOne (Group 3). Roots were sectioned 3, 6, and 9 mm from the apex, and the cut surface was observed microscopically and the presence of dentinal defects was checked. The differences between groups were analyzed using Fisher's exact test. Results: Unprepared roots did not show any dentinal defects. Dentinal defects were observed in all prepared roots. The difference between experimental groups and subgroups regarding the incidence of dentinal defects was not statistically significant. Conclusion: Canal preparation using hand or rotary files created radicular dentinal defects. The use of EDTA gel during root canal preparation did not reduce the incidence of dentinal defects.
  3,805 478 1
Histopathological evaluation of human pulp response to two self-etching resins
Nevin Cobanoglu, Fusun Ozer, Mustafa Demirci, Ozgür Ozdemir, Satoshi Imazato
January-April 2015, 3(1):1-7
Objective: The aim of this study was to evaluate the human pulp response following the application of two proprietary self-etch adhesive systems (Clearfil Protect Bond and Clearfil SE Bond). Materials and Methods: Deep Class V cavities were prepared on the teeth scheduled to be extracted. Cavities were covered with a composite resin (Clearfil APX) following the application of the bonding agents. The teeth were extracted after 7 or 90 days and prepared for histological investigation. The pulp response was categorized. Two cavities were restored with calcium hydroxide used as the control in the 7-day period. The data were submitted to two-way analysis of variance (ANOVA), Mann-Whitney U tests and Wilcoxon signed-rank test. Results: Inflammatory cell infiltration was not shown in most of the teeth. No significant statistical difference concerning all the histological evaluation criteria was observed among the groups of adhesive systems or between the control group and the groups of adhesive systems. (P > 0.05). Conclusion: Both bonding systems were found biologically compatible with pulp tissues in non-exposed cavities.
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Survival times of restorative parameters vis-à-vis material combinations
Sheela Sampath
January-April 2015, 3(1):14-20
Context: Two types of composite restorative modalities are compared: All-universal composite restoration (single) versus restorations done using flowable-universal composite combination (dual). Aims: To assess survival probabilities of three restorative parameters: Intactness,color match and marginal integrity.
  1. Whether the survival probabilities are influenced by restoration modality and cavity types, and if so, to what extent
  2. Clinically relevant deductions with respect to materials and clinical technique.
Settings and Design: A retrospective, case-control analytical study based on secondary data derived from documentation of evaluations of restorations placed in patients attending a primary dental care. Subjects and Methods: Data from the records of as many restorations that were routinely evaluated in the clinic, at different points in time for up to 5 years, were drawn up (2008 − 2013). The dual modality restorations were considered as 'cases' and the single modality restorations were deemed 'controls'. Statistical Analysis Used: The life-table method was applied for the survival analysis of each of the three clinical parameters. Qualitative analysis of these same parameters was also carried out using the Chi-square test with P < 0.05. Results: Survival probabilities of restoration retention (intactness) and color match were not influenced by the restorative modality, though marginal integrity's survival probability was; being slightly lower for flowable-universal combination. The subset of posterior load-bearing cavities performed similarly on all clinical parameters (survival as well as qualitatively), uninfluenced by the restorative modality. Conclusions: Overall, the lower survival of marginal integrity may necessitate sooner replacements for restorations done using flowable-universal combinations. However, in the specific case of classes I, II and built-ups i.e. posterior load bearing cavities, these might as well be restored with a combination of flowable-universal material.
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Clinical management of a traumatized maxillary central incisor restored with the original fragment using fiber-reinforced post system
Erhan Tahan, Mustafa Sadik Akdag, Oguz Kose, Mehmet Tanriver
January-April 2015, 3(1):31-34
This case report describes the management of a supragingivally complicated crown fracture of a maxillary central incisor. A 19-year-old male patient was referred to the Department of Endodontics for the management of his traumatized maxillary incisors. He had no medical disorders and there was no evidence of a periapical pathology in the initial radiograph. The maxillary left central and right lateral incisors had an enamel fracture but were asymptomatic to palpation and percussion tests so it was decided to be treated with a direct composite restoration. Whereas, the right central one was symptomatic and had a supragingivally complicated crown fracture. Therefore, it was medicated with calcium hydroxide dressing for one week. After the root canal treatment was completed, the tooth was restored using a light-transmitting fiber-reinforced post system with the original fragment. There was an excellent satisfaction with using original fractured fragment even after 12 months.
  2,695 360 -
Effect of new laser type on shear bond strenght of acrylic teeth to denture base
Meral Arslan Malkoç, Necla Demir, Ayse Tuba Ögreten, A Nilgun Ozturk, Hamdi Sükür Kiliç
January-April 2015, 3(1):26-30
Background: The aim of this study is to examine the Shear Bond Strength (SBS) to repairing acrylic or acrylic artificial teeth which applied to four different surface treatments. Materials and Methods: Fourty molar acrylic denture teeth were ground on the ridge lap area with a water sand paper to provide a uniform surface for bonding. Acrylic teeth embedded in cold cured acrylic resin and specimens were randomly seperated into four roups (n = 10), according to the urface treatments applied; 1-Control, 2-Air abrasion, 3-Er-YAG laser and 4-Femtosecond laser. The cold cured acrylic resin (Vertex self curing) was then mixed according to the manufacturer's instructions and injected into the Teflon tubes with an internal diameter and height of 4 and 3 mm, respectively. The SBS of the acrylic denture teeth was evaluated using a universal testing machine. Acrylic denture teeth bonding areas were observed with a stereomicroscope to identify the mode of fracture. Results: The data were evaluated statistically Kruskal Wallis one-way analysis of variance (ANOVA) and Mann Whitney U-tests with bonferronni correction. There were no statistically significant difference of mean bond strengths for shear tests among control, Er-YAG and Femtosecond laser application groups. But the highest SBS values were found for air abrasion groups. Conclusion: A quick and simple air abrasion surface treatment technique could be an effective option for denture repair.
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