This study aimed to compare the effect of fiber reinforcing methods on the flexural strength and ... more This study aimed to compare the effect of fiber reinforcing methods on the flexural strength and failure modes of indirect composite resins. Based on the reinforcement methods, the bar specimens (3 × 3 × 25 mm) were divided into five groups (n = 20). Glass or polyethylene fibers were used for reinforcement of indirect composite resins. Fibers were either light polymerized and mixed with indirect composite resin or mixed with indirect composite resin after resin application and polymerized together. Indirect composite resin without fiber reinforcement was used as control. All five types of specimens were stored in distilled water at 37°C for 24 h. Half of the specimens were additionally thermocycled. Then the specimens were tested in a three‐point bending test. Failure types were examined and categorized by using stereo microscope. The data were analyzed using two‐way ANOVA and Tukey HSD test. Flexural strength was found to be significantly higher for fiber‐reinforced indirect resin composites than control. However, the fiber‐reinforced groups did not present any significant difference. Analysis revealed aging does not affect the flexure strength of fiber reinforcement of indirect composite resin. The study concluded that the flexure strength of indirect composite resins was improved with fiber reinforcement. Different fiber reinforcement methods demonstrated similar effects on the flexure strength of indirect composite resin. Reinforcement with glass or polyethylene fibers presented the potential to improve the mechanical properties of indirect composite resins.Research HighlightsFlexural strength of indirect composite resins are affected by the reinforcement of composites with glass or polyethylene fibers. Aging with thermocycling has no effect on the flexural strength of the indirect composite resins, however can cause catastrophic failures in material.
Cene, yuz travmalari spor aktiviteleri sirasinda en sik karsilasilan maksillofasiyal yaralanmalar... more Cene, yuz travmalari spor aktiviteleri sirasinda en sik karsilasilan maksillofasiyal yaralanmalardandir. Agiz koruyuculari, kasklar ve yuz maskeleri ya da yuz kalkanlarinin uretimi dental yaralanmalarin sayisi ve siddetini azaltmada cok onemlidir. Bu nedenle gunumuzde, yapilan spora ve kullanan kisiye ozel olarak planlanan ve hazirlanan koruyucular kullanilmaktadir. Bu vaka raporunda, spor aktiviteleri sirasinda burnu korumak icin kullanilan kisiye ozel yuz maskesinin fabrikasyonu anlatilmaktadir.
Objective: The purpose of the study was to investigate the effect of different mouthrinses on the... more Objective: The purpose of the study was to investigate the effect of different mouthrinses on the color changes and surface roughness of a laboratory-processed composite. Method: 50 discs were made using GC Gradia/GC indirect composites and divided into five groups which immersed in artificial saliva and four different type of mouthrinses. The samples were immersed daily for 14 days in 20 ml of the solutions for 2 minutes twice a day (with a 12-hour interval between exposures). Measurements were carried out at four different times; 1 hour after sample preparation (t0); 1 day (t1), 7 days (t2) and 14 days (t3) after the first immersion in the solutions. The color before and after immersion was measured according to Comission Internationale de L’Eclairage (CIE L*, a*, b*) System and ΔL*, Δa*, Δb* and ΔE* values were calculated. The surface roughness Ra (µm) of the specimens was evaluated using a profilometer. Result: There were significant differences between the groups at all time re...
Objective: The aim of this study was to evaluate the marginal adaptation and fracture resistance ... more Objective: The aim of this study was to evaluate the marginal adaptation and fracture resistance of feldspathic and Polymer-Infiltrated Ceramic Network (PICN) CAD/CAM endocrowns for maxillary premolars. Materials and Methods: Twenty extracted human permanent maxillary premolars were randomly divided into two groups (n = 10); Group CEREC (GC), which was produced by feldspathic ceramic and the Group Enamic (GE), which was produced by PICN. All teeth were endodontically treated and decoronated horizontally at 2 mm above the cemento-enamel junction. Endocrown preparations were done with 4 mm depth into the pulp chamber. Endocrowns were manufactured using CAD/CAM from ceramic blocks. Following adhesive cementation, all specimens were subjected to thermocycling. Marginal adaptation evaluated under SEM at 200 × magnification. Each specimen was fixed in a universal testing machine and a compressive load was applied at 45° to long axis of the teeth until failure. Failure load was recorded and failure modes were evaluated. Statistical analyses were performed with SPSS 19.0 software and data were compared using Mann-Whitney U test. Results: There were no significant differences in the marginal adaptation between two groups (P > 0.05). GE presented significantly higher fracture resistance when compared to GC (P < 0.05). Failure pattern was similar and characterized by the tooth-ceramic fracture on the force-applied side. Conclusions: CAD/CAM fabricated feldspathic ceramic and PICN endocrowns provide sufficient marginal adaptation, but the PICN endocrowns shows higher fracture resistance than the feldspathic ceramic endocrowns.
Purpose of the Study: The purpose of the study was to investigate the effect of different mouthri... more Purpose of the Study: The purpose of the study was to investigate the effect of different mouthrinses on the color changes and surface roughness of a laboratory-processed composite. Methods and Materials: Fifty discs were made using GC Gradia/GC indirect composites and divided into five groups which immersed in artificial saliva and four different types of mouthrinses. The samples were immersed daily for 14 days in 20 mL of the solutions for 2 minutes twice a day (with a 12-hour interval between exposures). Measurements were carried out at four different times: 1 hour after sample preparation (t0), 1 day (t1), 7 days (t2), and 14 days (t3) after the first immersion in the solutions. The color before and after immersion was measured according to Comission Internationale de L'Eclairage (CIE L*, a*, b*) System and ΔL*, Δa*, Δb*, and ΔE* values were calculated. The surface roughness Ra (μm) of the specimens was evaluated using a profilometer. Results: There were significant differences between the groups at all time representing ΔE values (p < 0.001). At (t1) time representing ΔRa value, there were significant differences between the groups (p < 0.05). At (t2, t3) time representing ΔRa values, there were significant differences between the groups (p < 0.001). Pharmol Zn immersed specimens showed ΔE values between 1.04 and 3.67. Conclusions: The result of this study indicated that the mouthrinses affected the color stability of indirect composites.
The ideal restoration of endodontically treated teeth (ETT) has been widely and controversially d... more The ideal restoration of endodontically treated teeth (ETT) has been widely and controversially discussed in the literature. Prevention of healthy dental structure is essential to help mechanical stabilization of tooth-restoration integrity, increase the amount of suitable surfaces for adhesion and thus positively affect the long-term success. ETT are affected by a higher risk of biomechanical failure than vital teeth. With the development of adhesive systems, the need for post-core restorations is also reduced. Especially for restoration of excessively damaged ETT, endocrowns have been used as an alternative to the conventional post-core and fixed partial dentures. Compared to conventional methods, good aesthetics, better mechanical performance, and less cost and clinic time are the advantages of endocrowns.
This study aimed to compare the effect of fiber reinforcing methods on the flexural strength and ... more This study aimed to compare the effect of fiber reinforcing methods on the flexural strength and failure modes of indirect composite resins. Based on the reinforcement methods, the bar specimens (3 × 3 × 25 mm) were divided into five groups (n = 20). Glass or polyethylene fibers were used for reinforcement of indirect composite resins. Fibers were either light polymerized and mixed with indirect composite resin or mixed with indirect composite resin after resin application and polymerized together. Indirect composite resin without fiber reinforcement was used as control. All five types of specimens were stored in distilled water at 37°C for 24 h. Half of the specimens were additionally thermocycled. Then the specimens were tested in a three‐point bending test. Failure types were examined and categorized by using stereo microscope. The data were analyzed using two‐way ANOVA and Tukey HSD test. Flexural strength was found to be significantly higher for fiber‐reinforced indirect resin composites than control. However, the fiber‐reinforced groups did not present any significant difference. Analysis revealed aging does not affect the flexure strength of fiber reinforcement of indirect composite resin. The study concluded that the flexure strength of indirect composite resins was improved with fiber reinforcement. Different fiber reinforcement methods demonstrated similar effects on the flexure strength of indirect composite resin. Reinforcement with glass or polyethylene fibers presented the potential to improve the mechanical properties of indirect composite resins.Research HighlightsFlexural strength of indirect composite resins are affected by the reinforcement of composites with glass or polyethylene fibers. Aging with thermocycling has no effect on the flexural strength of the indirect composite resins, however can cause catastrophic failures in material.
Cene, yuz travmalari spor aktiviteleri sirasinda en sik karsilasilan maksillofasiyal yaralanmalar... more Cene, yuz travmalari spor aktiviteleri sirasinda en sik karsilasilan maksillofasiyal yaralanmalardandir. Agiz koruyuculari, kasklar ve yuz maskeleri ya da yuz kalkanlarinin uretimi dental yaralanmalarin sayisi ve siddetini azaltmada cok onemlidir. Bu nedenle gunumuzde, yapilan spora ve kullanan kisiye ozel olarak planlanan ve hazirlanan koruyucular kullanilmaktadir. Bu vaka raporunda, spor aktiviteleri sirasinda burnu korumak icin kullanilan kisiye ozel yuz maskesinin fabrikasyonu anlatilmaktadir.
Objective: The purpose of the study was to investigate the effect of different mouthrinses on the... more Objective: The purpose of the study was to investigate the effect of different mouthrinses on the color changes and surface roughness of a laboratory-processed composite. Method: 50 discs were made using GC Gradia/GC indirect composites and divided into five groups which immersed in artificial saliva and four different type of mouthrinses. The samples were immersed daily for 14 days in 20 ml of the solutions for 2 minutes twice a day (with a 12-hour interval between exposures). Measurements were carried out at four different times; 1 hour after sample preparation (t0); 1 day (t1), 7 days (t2) and 14 days (t3) after the first immersion in the solutions. The color before and after immersion was measured according to Comission Internationale de L’Eclairage (CIE L*, a*, b*) System and ΔL*, Δa*, Δb* and ΔE* values were calculated. The surface roughness Ra (µm) of the specimens was evaluated using a profilometer. Result: There were significant differences between the groups at all time re...
Objective: The aim of this study was to evaluate the marginal adaptation and fracture resistance ... more Objective: The aim of this study was to evaluate the marginal adaptation and fracture resistance of feldspathic and Polymer-Infiltrated Ceramic Network (PICN) CAD/CAM endocrowns for maxillary premolars. Materials and Methods: Twenty extracted human permanent maxillary premolars were randomly divided into two groups (n = 10); Group CEREC (GC), which was produced by feldspathic ceramic and the Group Enamic (GE), which was produced by PICN. All teeth were endodontically treated and decoronated horizontally at 2 mm above the cemento-enamel junction. Endocrown preparations were done with 4 mm depth into the pulp chamber. Endocrowns were manufactured using CAD/CAM from ceramic blocks. Following adhesive cementation, all specimens were subjected to thermocycling. Marginal adaptation evaluated under SEM at 200 × magnification. Each specimen was fixed in a universal testing machine and a compressive load was applied at 45° to long axis of the teeth until failure. Failure load was recorded and failure modes were evaluated. Statistical analyses were performed with SPSS 19.0 software and data were compared using Mann-Whitney U test. Results: There were no significant differences in the marginal adaptation between two groups (P > 0.05). GE presented significantly higher fracture resistance when compared to GC (P < 0.05). Failure pattern was similar and characterized by the tooth-ceramic fracture on the force-applied side. Conclusions: CAD/CAM fabricated feldspathic ceramic and PICN endocrowns provide sufficient marginal adaptation, but the PICN endocrowns shows higher fracture resistance than the feldspathic ceramic endocrowns.
Purpose of the Study: The purpose of the study was to investigate the effect of different mouthri... more Purpose of the Study: The purpose of the study was to investigate the effect of different mouthrinses on the color changes and surface roughness of a laboratory-processed composite. Methods and Materials: Fifty discs were made using GC Gradia/GC indirect composites and divided into five groups which immersed in artificial saliva and four different types of mouthrinses. The samples were immersed daily for 14 days in 20 mL of the solutions for 2 minutes twice a day (with a 12-hour interval between exposures). Measurements were carried out at four different times: 1 hour after sample preparation (t0), 1 day (t1), 7 days (t2), and 14 days (t3) after the first immersion in the solutions. The color before and after immersion was measured according to Comission Internationale de L'Eclairage (CIE L*, a*, b*) System and ΔL*, Δa*, Δb*, and ΔE* values were calculated. The surface roughness Ra (μm) of the specimens was evaluated using a profilometer. Results: There were significant differences between the groups at all time representing ΔE values (p < 0.001). At (t1) time representing ΔRa value, there were significant differences between the groups (p < 0.05). At (t2, t3) time representing ΔRa values, there were significant differences between the groups (p < 0.001). Pharmol Zn immersed specimens showed ΔE values between 1.04 and 3.67. Conclusions: The result of this study indicated that the mouthrinses affected the color stability of indirect composites.
The ideal restoration of endodontically treated teeth (ETT) has been widely and controversially d... more The ideal restoration of endodontically treated teeth (ETT) has been widely and controversially discussed in the literature. Prevention of healthy dental structure is essential to help mechanical stabilization of tooth-restoration integrity, increase the amount of suitable surfaces for adhesion and thus positively affect the long-term success. ETT are affected by a higher risk of biomechanical failure than vital teeth. With the development of adhesive systems, the need for post-core restorations is also reduced. Especially for restoration of excessively damaged ETT, endocrowns have been used as an alternative to the conventional post-core and fixed partial dentures. Compared to conventional methods, good aesthetics, better mechanical performance, and less cost and clinic time are the advantages of endocrowns.
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