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Öğe Amalgam repair: Evaluation of bond strength and microleakage(OPERATIVE DENTISTRY INC, 2002) Ozer, F; Unlu, N; Ozturk, B; Sengun, AThis study evaluated the tensile bond strength of "repaired" amalgams and compared the degree of microleakage. Amalgam (Cavex avalloy) was condensed into plastic tubes (3 mm in diameter, 10 mm. in height) to the half-length. After storage in water at 37degreesC for two days, the remaining parts of tubes were filled with amalgam (A), cavity varnish (CV)+A, Liner Bond 2V (LB2V)+A, 3M Opal Luting Cement (3MOLC)+A, Panavia F(PF)+A, Metabond(MB)+A, Fuji BondLC(FB)+A, HytacOSB(HOSB)+Hytac Aplitip (H), Liner Bond2V+Clearfil AP-X(CAP). The bond strengths for 15 samples of each restoration group were determined. For the microleakage study, MOD cavities of 90 extracted human premolars were used. The distal half of cavities were filled with amalgam. After storage in water at 37degreesC for two days, the mesial half of the cavities were filled to simulate a clinical repair. The "repair" was placed using the procedures applied in the bond strength study. The teeth were stained with basic fuchsine (0.5%), sectioned and evaluated for dye penetration. In both parts of study, the data were analyzed by ANOVA and Duncan's multiple range tests. Bond strength values (MPa) were: A+PF+A 3.84+/-1.08, A+LB2V+A 3.15+/-0.97, A+LB2V+CAP 3.05+/-0.53, A+MB+A 2.86+/-0.88, A+HOSB+H 2.58+/-0.51, A+3MOLC+A 2.11+/-0.75, A+FB+A 0.68+/-0.59. The repaired A+A and A+CV+A groups were separated before testing. The A+PF+A group showed the highest bond strength (p<0.05). Microleakage in the cervical margins of repaired restorations was lower in the amalgam groups than microleakage in the resin composite and compomer groups. PF, MB, 3MOLC and FB performed better at the amalgam "repair" interface. The A+LB2V+A group showed no microleakage at both the occlusal and gingival test regions.Öğe Atypical middle lobe and lingula involvement in kerosene pneumonitis(INT UNION AGAINST TUBERCULOSIS LUNG DISEASE (I U A T L D), 2004) Kanat, F; Vatansev, H; Ozer, F; Imecik, O[Abstract not Available]Öğe Bonding to sound vs caries-affected dentin using photo- and dual-cure adhesives(OPERATIVE DENTISTRY INC, 2005) Say, EC; Nakajima, M; Senawongse, P; Soyman, M; Ozer, F; Tagami, JThis study aimed to evaluate the microtensile bond strength (muTBS) of photo- and dual-cure adhesives to sound and caries-affected dentin using total- and self-etch techniques. Human third molars with occlusal caries were prepared as previously described by Nakajima and others (1995). Dentin surfaces were bonded with Optibond Solo Plus (Kerr; photo-cure adhesive) or Optibond Solo Plus + Dual-cure activator (Kerr; dual-cure adhesive) with total- and self-etch technique. Clearfil AP-X (Kuraray) was used for composite buildups. Following storage in distilled water at 37degreesC for 24 hours, the teeth were sectioned into 0.7-mm thick slices to obtain sound and caries-affected dentin slabs, then trimmed to form hour glass shapes with a 1 mm(2) cross-sectional area. The specimens were subjected to microtensile testing using EZ-test (Shimadzu) at 1 mm/minute. Data were analyzed using three-way ANOVA and Student's t-Test (p<0.05). Bond strengths to sound dentin with photo- and dual-cure adhesives using total- and self-etch techniques were significantly higher than those to caries-affected dentin. Dual-cure adhesive significantly decreased bond strengths both to sound and caries-affected dentin. The total-etch technique showed no beneficial effect on caries-affected dentin compared with the self-etch technique. Scanning electron microscopic observation of the resin-dentin interfaces revealed that hybrid layers in caries-affected dentin were thicker than those observed in sound dentin with photo- and dual-cure adhesives. Resin infiltration into dentinal tubules of caries-affected dentin was hampered by the presence of mineral deposits.Öğe Chemical degradation of restorative materials(TRANS TECH PUBLICATIONS LTD, 2004) Sazak-Ovecoglu, H; Gunday, M; Ovecoglu, ML; Ozer, F; Tarcin, BThe chemical environment is an important aspect of the oral environment that could have an appreciable influence on restorative materials. The effects of chemical media on surface roughness, Vickers hardness and weight loss of a ceramic material, a hybrid ceramic resin, an ormocer and a posterior composite were investigated. The specimens were made for each material and were stored in artificial saliva at 37degreesC for 24 h. The weight of the specimens were recorded and then randomly divided into two groups and stored in the following chemicals for 2 weeks at 37degreesC: 0.02 N citric acid and 0.02 N lactic acid. After conditioning, the specimens were weighed again and subjected to Vickers hardness and surface roughness tests. The specimens were also examined in the scanning electron microscopy (SEM). All results were analyzed statistically. After a 2 week storage period, there was a significant weight loss in P60(TM) stored in citric acid and Admira(TM) stored in lactic acid. Vickers hardness values of all materials except Finesse were increased significantly (p<0.05).Öğe Effect of desensitizers on the bond strength of a self-etching adhesive system to caries-affected dentin on the gingival wall(OPERATIVE DENTISTRY INC, 2005) Sengun, A; Koyuturk, AE; Sener, Y; Ozer, FA self-etching dentin adhesive was evaluated for its ability to bond to caries-affected and sound dentin after applying three desensitizers to the gingival walls. Sixty extracted human molars, with approximal dentin caries, were cut horizontally on the long axis of the tooth through caries-affected gingival walls. Carious dentin was removed with SiC paper by means of a caries detector to expose caries-affected dentin. The molars were randomly assigned to four groups: control and three experimental groups-Micro Prime, Glauma Desentizer and Cervitec. Desensitizers were applied to the dentinal surfaces according to manufacturers' instructions. A resin composite was bonded to both the caries-affected and sound dentin of each tooth using a bonding system and plastic rings. The restoration was debonded by shear bond strength. The application of Micro Prime and Gluma Desensitizer to caries-affected dentin did not show any effect on bond strength testing. However, Cervitec caused a decrease in bond strength to caries-affected dentin. The effect of desensitizers on the bond strength of the self-etch bonding agent to caries-affected dentin changed according to the chemical composition of the materials. Desensitizer application on sound dentin is recommended with self-etch bonding systems.Öğe Effect of NaOCI on bond strengths of bonding agents to pulp chamber lateral walls(LIPPINCOTT WILLIAMS & WILKINS, 2004) Ozturk, B; Ozer, FThe objective of this study was to evaluate the effects of 5% NaOCI on bond strengths of four bonding systems-Clearfil SE Bond, Prompt L-Pop, Prime&Bond NT, and Scotchbond Multi Purpose Plus-to pulp chamber mesial walls. Forty mandibular third molar teeth were used in the study. The pulp chambers of the first 20 teeth were restored with bonding agents and composite resins after 5% NaOCI irrigation, and the remaining teeth were restored without 5% NaOCI treatment. Each bonding group had five teeth. Three rectangular thin sticks (1 +/- 0.03 mm(2)) were obtained from the mesial wall of restored pulp chambers by horizontal sectioning. In general, NaOCI application decreased the bond strength values of the bonding agents. Both Clearfil SE Bond and Prompt L-Pop without NaOCL showed higher bond strength values than the other bonding groups. In NaOCl-applied groups, Clearfil SE Bond had the highest bond strength. It can be concluded that self-etching bonding systems are more successful than the other systems in bonding to pulp chamber dentinal wall and that NaOCI reduces bond strength.Öğe Effect of tooth age on microtensile bond strength of two fluoride-releasing bonding agents(QUINTESSENCE PUBLISHING CO INC, 2005) Ozer, F; Sengun, A; Ozturk, B; Say, EC; Tagami, JPurpose: The purpose of this study was to evaluate the effect of age of dentin and enamel on the microtensile bond strengths of a glass-ionomer based, all-in-one, single-step, self-etching adhesive system (Reactmer Bond, RB) and an antibacterial, two-step self-etching primer system (ABF Bond, ABF). \ Materials and Methods: Extracted molars from 3 age groups (20 to 25, 35 to 40, and 50 to 55 years) were used. Enamel was removed from the occlusal surfaces of the teeth, and the entire flat surfaces were covered with composite resin (4 mm in height) following application of bonding agents. The bonded specimens were thinly sectioned parallel to the long axis of the tooth into 0.87 0.03 mm(2) rectangular sections, resulting in 6 to 7 enamel specimens and 10 to 15 dentin specimens per tooth. The specimens were subjected to the microtensile test at a crosshead speed of 1 mm/min. The data were analyzed by Univariate ANOVA, Tukey HSD, and regression analysis. Results: The bond strength of ABF to both enamel and dentin was higher than the bond strength of RB. Bond strengths of ABF to dentin were significantly higher than the bond strengths to enamel (p < 0.05). The 35- to 40-year age group of ABF showed the highest bond strength of all. In RB dentin groups, 34% of specimens showed cohesive failure in composite resin material. Conclusion: Bond strength values to enamel were not affected by age of teeth in either bonding system. Dentinal bond strength using ABF changed according to age of the teeth. Age did not affect bond strength values of RB to dental hard tissues. However, the high number of cohesive failures in Reactmer paste indicated low tensile strength of the material.Öğe The effect on shear bond strength of different antimicrobial agents after acid etching(OXFORD UNIV PRESS, 2005) Malkoc, S; Demir, A; Sengun, A; Ozer, FThe aim of the present study was to determine whether the application of different primers containing antibacterial agents (Micro Prime (TM), Seal&Protect (TM), and Gluma Desensitizer (TM)) can affect the shear bond strength (SBS) of an orthodontic resin composite. Seventy-two crowns of extracted lower human incisors were mounted in acrylic resin leaving the buccal surface of the crowns parallel to the base of the moulds. The teeth were randomly distributed into three experimental and one control group, each containing 18 teeth. In each experimental group, the primers were applied to the etched enamel surfaces. In the control group, no antibacterial primer was used. An orthodontic composite resin was applied to the surface into cylindrical-shaped plastic matrices after application of an orthodontic adhesive primer (Transbond XT). For shear bond testing, a stubby-shaped force transducer apparatus (Ultradent) was applied at a crosshead speed of 1 mm/minute to each specimen at the interface between the tooth and the composite until failure occurred. A Kruskal-Wallis one-way ANOVA and a Mann-Whitney U-test with a Bonferroni adjustment were used for statistical analysis. There was no significant difference between Seal&Protect (TM) (27.98 +/- 8.73 MPa) and the control (35.15 +/- 7.85 MPa) (P > 0.05). However, Gluma (TM) (21.61 +/- 7.96 MPa) and Micro Prime (TM) (14.89 +/- 5.55 MPa) caused a decrease in bond strength (P < 0.05). No statistically significant difference was observed between Seal&Protect (TM) and Gluma (TM) (P > 0.05). As triclosan containing Seal&Protect (TM) did not cause a significant decrease in bond strength, it can potentially be used under an orthodontic resin composite to obtain an antibacterial effect. However, further in vivo studies are required.Öğe Evaluation of internal adaptation in ceramic and composite resin inlays by silicon replica technique(BLACKWELL PUBLISHING LTD, 2005) Karakaya, S; Sengun, A; Ozer, FThis study was aimed at investigating the internal adaptation of a ceramic (Ceramco II) and two composite resin inlay materials (SureFil and 3M Filtek Z 250(TM)) using silicon replica technique as an indicator. Forty-five standard mesial-occlusal-distal (MOD) cavities were prepared into brass moulds by using computer numerically controlled system. Inlays were prepared according to manufacturers' instructions with indirect methods. Replicas of the prepared cavities and inlays were produced with a polyvinyl siloxane material (Elite H-D). The spaces between inlays and cavities were filled by different coloured light-body polyvinyl siloxane material. Two parallel slices (mesio-distally) were obtained from the replicas with a sharp blade. Different coloured polyvinyl siloxane material thickness between cavity and inlay was measured at seven points (mesial, occlusal and distal). The data were evaluated with ANOVA and Tukey's honestly significantly different (HSD) statistical tests. In the SureFil and Ceramco II groups, the sizes of the contraction gaps at mesial and distal gingival floors were greater than that of the occlusal marginal walls. In comparison of gap formation at occlusal regions, while the 3M composite group showed highest gap values (204.33 +/- 75.45 mu m), the Ceramco II group revealed the lowest (141.17 +/- 23.66 mu m) (P < 0.05). At the gingival floors, gap formation of Ceramco II group was the highest (227.08 +/- 51.95 mu m). Neither the 3M Filtek Z250 nor SureFil group showed any statistical difference between gap values of their self-occlusal and gingival floors (P > 0.05). In conclusion, our results showed that ceramic inlays did not confer any big advantage for internal adaptation over the composite inlays.Öğe An evaluation of surface hardness, roughness and wear of restorative composites, porcelain, and enamel following abrasion by enamel(TRANS TECH PUBLICATIONS LTD, 2004) Unlu, N; Donmez, N; Sengun, A; Ozer, FThis study was performed to evaluate wear, surface hardness and roughness characteristics of light cured restorative composites, porcelain and enamel when opposed by human enamel. Five composite resins (3MSilux, ClearfilAP-X, 3MFiltek Z250, Pekalite, SureFil), one ceramic (VitadurAlpha) and enamel were selected as experimental materials. The antagonist abrasives were made by using buccal enamel of anterior teeth. Ten rectangular specimens were prepared for each material. The at the beginning of the study, the mean weight, roughness and hardness values of specimens were obtained. Then the specimens were opposed by human enamel and subjected to 20.000 sliding cycles in a prototype wear machine. Surface characteristics and final weights of each materials were recorded and compared to the values obtained at the beginning. Statistically significant differences were found among the hardness and roughness of materials (p<0.05). After wear procedure, surface hardness of all materials increased. There was not any significant difference among the wear values of materials and enamel.Öğe In vitro assessment of temperature change in the pulp chamber during cavity preparation(MOSBY, INC, 2004) Ozturk, B; Usumez, A; Ozturk, AN; Ozer, FStatement of problem. Tooth preparation with a high-speed handpiece may cause thermal harm to the dental pulp. Purpose. This in vitro study evaluated the temperature changes in the pulp chamber during 4 different tooth preparation techniques and the effects of 3 different levels of water cooling. Material and methods. The tip of a thermocouple was positioned in the center of the pulp chamber of 120 extracted human premolar teeth. Four different tooth preparation techniques were compared: (1) Low air pressure plus low load (LA/LL), (2) low air pressure plus high load (LA/HL), (3) high air pressure plus low load (HA/LL), and (4) high air pressure plus high load (HA/HL) in combination with 3 different water cooling rates. Control specimens were not water cooled; low water cooling consisted of 15 mL/min, and high water cooling consisted of 40 mL/min. Twelve different groups were established (n = 10). An increase of 5.5degreesC was regarded as critical value for pulpal health. The results were analyzed with a 3-factor ANOVA and Bonferroni adjusted Mann Whitney U test (alpha = .004). Results. For all techniques without water cooling (LA/LL/0, LA/HL/0, HA/LL/0, and HA/HL/0), the average temperature rise within the pulpal chamber exceeded 5.5degreesC during cavity preparation (7.1degreesC; 8.9degreesC; 11.4degreesC, and 19.7degreesC, respectively). When low water cooling was used with high air pressure and high load technique (HA/HL/15), the average temperature rise exceeded 5.5degreesC limit (5.9degreesC). However, when high water cooling (LA/LL/40, LA/HL/40, HA/LL/40, and HA/HL/40) was utilized, the critical 5.5degreesC value was not reached with any air pressure or load (3.1degreesC, 2.8degreesC, 2.2degreesC, and -1.8degreesC, respectively). Conclusion. Within the limitations of this in vitro study, the results indicate that reducing the amount of water cooling or increasing air pressure and load during cavity preparation increased the temperature of the pulp chamber in extracted teeth.Öğe An in vitro comparison of adhesive systems to seal pulp chamber walls(BLACKWELL PUBLISHING LTD, 2004) Ozturk, B; Ozer, F; Belli, SAim To compare in vitro the sealing properties of five different dentine adhesive materials (Prime&Bond NT (PBNT): Prompt L-Pop (PLP): Clearfil SE Bond (CSEB): Scotchbond Multi Purpose Plus (SMPP): EBS-Multi (EBSM)) inside the pulp chamber. Methodology Seventy-five recently extracted human molar teeth were used. The roof of the pulp chambers and roots were removed under water cooling. Pulp tissue was removed. and the canal orifices were scaled. The pulp chambers were then treated with 51% sodium hypochlorite (NaOCl) for 1 min. The teeth were randomly divided into five groups of 15 teeth each. Adhesive systems were applied to the pulp chamber walls according to the manufacturers' instructions. The samples were connected to Plexiglass plates. and a fluid filtration met hod was used for quantitative evaluation of leakage. Measurements of fluid movement were made at 2-min intervals for S min. The quality of seal of each specimen was measured immediately after 24 h. 1 week and 1 month. The data were statistically analysed by repeated-measurements multivariate ANOVA, Friedman test. Wilcoxon signed rank test. Kruskal-Wallis of one-way ANOVA and Mann-Whitney U-tests. The pulp chamber wall with and without NaOCl and resin-dentine interfaces of specimens were observed under a scanning electron microscope (SEM). Results The leakage values of the materials were significantly different. at. different measurement periods. In all groups, leakage values decreased with time (P < 0.05). PBNT and PLP had the least leakage during immediate measurements (11 < 0.05). After 1 month, leakage of all adhesive systems was not significantly different (P < 0.05). SEM observation Of Pull) chamber walls demonstrated that the irregular dentine surface without smear layer was present in the nontreated group. However, NaOCl application removed the collagen fibrils leaving the dentine surface smooth. At resin-dentine interfaces of specimens, no hybridization zone was observed. Conclusions None of the materials had created a perfect seal to the Pulp chamber walls. PBNT and PLP had better sealing over the short term, but over the long term, there were no differences between the materials.Öğe Mechanical properties of ceramics and composite resins(TRANS TECH PUBLICATIONS LTD, 2004) Sazak-Ovecoglu, H; Tarcin, B; Ozer, F; Gunday, M; Ovecoglu, ML; Gulmez, TWe investigated the mechanical properties of certain dental restorative materials to assess their durability. This study determines the flexural strength of a ceramic material (Finesse(TM), Dentsply), a hybrid ceramic resin (Estenia(TM), Kuraray), an ormocer (Admira(TM), Voco) and a posterior composite resin (Solitaire2(TM), Heraeus Kulzer). The specimens were fabricated from the various restoratives. Flexural strength was determined in 4-point bending. Scanning electron microscopy (SEM) was used to examine and compare surface topography of the fractured and nonfractured surfaces. The results were analyzed statistically. The flexural strength values of Estenia(TM) samples were significantly higher compared to those of Admira(TM) and Finesse(TM) (p<0.006).Öğe Microtensile bond strength of a filled vs unfilled adhesive to dentin using self-etch and total-etch technique(ELSEVIER SCI LTD, 2006) Say, EC; Nakajima, M; Senawongse, P; Soyman, M; Ozer, F; Ogata, M; Tagami, JObjective: The purpose of this study was to evaluate the effect of a filled adhesive (One-Step Plus; Bisco) versus an unfilled adhesive (One-Step; Bisco) on the microtensite bond strength (mu TBS) to dentin using total-etch (Uni-etch; Bisco) and self-etch (Tyrian SPE; Bisco) techniques. Methods: Twenty extracted human third molars were ground flat to expose occlusal dentin. After the dentin surfaces were polished with 600-grit SiC paper, the teeth were randomly assigned to four groups according to the bonding agent and technique being used. Dentin surfaces were bonded with One-Step Plus + total-etch; One-Step Plus+self-etch; One- Step+ total-etch and One-Step + self-etch. Composite buildups were performed with Clearfil AP-X (Kuraray Medical). Following storage in distilled water at 37 degrees C for 24 h, the bonded specimens were serially sectioned into 0.7 mm-thick stabs and then trimmed to hour-glass shapes with a 1 mm? cross-sectional area (n = 20). Microtensile bond strengths were determined using the EZ-test (Shimadzu) at a cross-head speed of 1 mm/min. Data were analyzed using two-way ANOVA and Tukey's post hoc test. Results: There were no significant differences in the mu TBS between One-Step Plus and One-Step adhesives when they were used with the total-etch and self-etch techniques (p > 0.05). However with the total-etch technique both adhesives yielded significantly higher bond strength values than the self-etch technique (p < 0.001). Conclusion: The fitted adhesive One-Step Plus did not show any beneficial effect than the unfilled adhesive One-Step on the mu TBS to dentin with total-etch and self-etch techniques. Irrespective from the adhesive type, self-etch technique revealed lower bond strengths than the total-etch technique. (c) 2005 Elsevier Ltd. All rights reserved.Öğe Microtensile bond strength of two resin composite materials placed with direct and indirect techniques under simulated pulpal pressure(QUINTESSENCE PUBLISHING CO INC, 2005) Sengun, A; Unlu, N; Ozturk, B; Ozer, FPurpose: The aim of this in vitro study was to compare the dentin bond strength of directly and indirectly inserted composite restorations. Materials and Methods: Twenty extracted human mandibular molars were prepared to form a flat occlusal dentin surface using an Isomet saw under water. Five-mm-thick composite restorations (Filtek Z 250 and Clearfil AP-X) were placed on the dentin surfaces by direct or indirect techniques. The direct restorations were bonded with Single Bond and Clearfil SE Bond bonding agents. Indirect restorations were cemented with two composite luting cements (3M Opal Luting Cement and Panavia F). All restorative procedures were applied under simulated pulpal pressure (15 cm H2O). Each tooth was then vertically sectioned with an Isomet saw through the composite buildups and the dentin. Thus, for microtensile testing, 0.65 x 0.65 mm specimens were obtained from pulpal and remote dentin regions. The results were analyzed according to the regional dentinal surfaces (pulpal and remote dentin). For statistical analyses, two-way ANOVA and Duncan post-hoc tests were used (p < 0.05). Results: Direct application of Clearfil AP-X showed that tensile bond strengths were higher than those obtained for directly and indirectly applied Filtek Z 250 and indirectly applied Clearfil AP-X. No significant difference in tensile bond strengths was demonstrated between pulpal and remote dentin (p > 0.05). Conclusion: It is concluded that the bond strengths of resin luting cements to dentin need further improvement.Öğe Shear bond strength of three luting cements to two ceramic materials(TRANS TECH PUBLICATIONS LTD, 2004) Ozturk, B; Ozturk, N; Ovecoglu, HS; Ozer, FThe aim of this study was to evaluate the shear bond strength of three different dual cure luting cements to two ceramic materials. Sixty cylindrical specimens (4mm in diameter) were prepared with Finesse Ceramco and Vita Omega 900. Specimens were randomly diveded into six groups of 10 specimen each. The luting cements (Panavia F; 3M ESPE Opal Luting Cement; Variolink H) were bonded to ceramic specimens using teflon tubes with an internal diameter of 2,97 nun and 2 mm in hight. Following thermocycling, the sepecimens were mounted in a spesific jig on the Universal Testing Machine and the luting cements debonded under a shear force at a crosshead speed of 0.5 mm/min. The bond strength was calculated in Mpa. The values of the shear bond strengths were analysed by using Two Way ANOVA, Kruskal-wallis of One Way ANOVA and Mann-Whitney U test. There were no statistically significant differences between the bond strength values of Finesse and Vita Omega 900 porcelains. Dual-cure cements (Panavia F and Variolink H) showed higher bond strength than light cure cement (3M ESPE Opal Luting cement).Öğe Shear bond strengths of self-etching adhesives to caries-affected dentin on the gingival wall(JAPANESE SOC DENTAL MATERIALS DEVICES, 2006) Koyuturk, AE; Sengun, A; Ozer, F; Sener, Y; Gokalp, AThe purpose of this study was to evaluate the bonding ability of five current self-etching adhesives to caries-affected dentin on the gingival wall. Seventy extracted human molars with approximal dentin caries were employed in this study. In order to obtain caries-affected dentin on the gingival wall, grinding was performed under running water. Following which, specimens mounted in acrylic blocks and composite resins of the bonding systems were bonded to dentin with plastic rings and then debonded by shear bond strength. With Clearfil SE Bond, bonding to caries-affected dentin showed the highest bond strength. With Optibond Solo Plus Self-Etch, bonding to caries-affected dentin showed higher shear bond strength than AQ Bond, Tyrian SPE & One-Step Plus, and Prompt-L-Pop (p<0.05). Further, the bond strengths of Clearfil SE Bond and Optibond Solo Plus Self-Etch to sound dentin were higher than those of Prompt-L-Pop, AQ Bond, and Tyrian SPE & One-Step Plus (p<0.05). In conclusion, besides micromechanical interlocking through hybrid layer formation, bond strength of self-etch adhesives to dentin may be increased from additional chemical interaction between the functional monomer and residual hydroxyapatite. The results of this study confirmed that differences in bond strength among self-etching adhesives to both caries-affected and sound dentin were due to chemical composition rather than acidity.Öğe Shear bond strengths of tooth fragments reattached or restored(BLACKWELL PUBLISHING LTD, 2003) Sengun, A; Ozer, F; Unlu, N; Ozturk, BThis study investigated the shear bond strengths of sectioned human mandibular incisor edge fragments reattached using luting cements, bonding agents or restored with composite resins. Seventy teeth were randomly distributed among six experimental groups and a control group. Leaving half of the anatomic crowns exposed, the teeth were embedded in self-cure acrylic resins with the exposed part then sectioned. The fragments in groups 1-4 were bonded to their respective teeth using Clearfil Liner Bond 2V, Scotch Bond Multi Purpose Plus, Panavia-F and 3M Opal Luting cement. The 5th and 6th groups were restored with composite resins (Silux 3M and Clearfil AP-X) using their bonding agents (Single Bond and Clearfil SE Bond). The results indicated that reattachment of fractured incisal fragments by using new generation bonding agents was effective against shear stresses, comparable with the intact teeth. Instead of restoration with composite resins therefore reattachment of a fractured fragment might be more preferable in cases of dental trauma.Öğe Surface roughness and hardness of some dental ceramics and restorative resins(TRANS TECH PUBLICATIONS LTD, 2004) Karakaya, S; Unlu, N; Ovecoglu, HS; Ozer, FThe aim of this study was to compare the surface hardness and roughness of seven composite resins AElite LS(AE), Clearfil Poto Posterior(CPP), SureFil (SF), Tetric Ceram (TC), Artglass (AG), Admira (AD), Estenia (ES)) and two ceramic materials (Vitadur Alfa (VA), Finesse(FI)). The composite speciemens were cured in cylindirical brass molds (4mm, in diameter and 2 mm in depth) against glass according to manufacturers' directions and polished. The ceramic specimens were prepared in same diameters, glazed. Hardness was determined at two different sites on one side specimens and the mean value was calculated as Vicker's Hardness Numbers (VHN). Surface roughness (SR) was measured tree times as Ra (mum) on each specimen and mean roughness values were obtained. For statistical analyses Mann Whitney U test was used. Surface roughness values of CPP, ES were very close to that of VA. Their surface roughness values were significantly higher than other materials. VHN of ES and AG were significantly lower than that of two ceramic materials. The surface hardness of ES was significantly harder than composite resins (P<0.05)Öğe Temperature rise during adhesive and resin composite polymerization with various light curing sources(OPERATIVE DENTISTRY INC, 2004) Ozturk, B; Ozturk, AN; Usumez, A; Usumez, S; Ozer, FThis study evaluated the temperature rise in two different adhesive (Clearfil SE Bond [CSEB] and EBS-Multi [EBSM]) and composite systems (Clearfil AP-X [CAPX,] Pertac II [PII]) by the same manufacturer when illuminated by four different light sources: Light-emitting diode (LED), Plasma arc curing (PAC), high intensity quartz tungsten halogen (HQTH) and quartz tungsten halogen (QTH). Forty dentin disks were prepared from extracted premolars. These dentin disks were placed in apparatus developed to measure temperature rise. Temperature rise during photopolymerization of adhesive resin and resin composite was then measured. The mean values of temperature increases for adhesive and resin composites did not differ significantly (p = 0.769). The highest temperature rise was observed during photopolymerization of EBSM with PAC (5.16degreesC) and HQTH (4.28degreesC), respectively. Temperature rise values produced by QTH (1.27degreesC - 2.83degreesC for adhesive resin; 1.86degreesC - 2.85degreesC for resin composite) for both adhesive and resin composites were significantly lower than those induced by PAC and HQTH (p < 0.05). However, these values were significantly higher than those produced by LED (1.16degreesC - 2.08degreesC for adhesive resin; 1.13degreesC - 2.59degreesC for resin composite). Light sources with high energy output (PAC and HQTH) caused significantly higher temperature rise than sources with low energy output (QTH and LED). However, in this study, no temperature rises beneath 1-mm dentin disk exceed the critical 5.6degreesC value for pulpal health.
