This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine ... more This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine between laser-assisted endodontic preparation and conventional method of preparation in which the smear layer was removed using sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic (EDTA). Sixty single-rooted teeth were used which were decoronated and endodontically prepared. The teeth were then randomly assigned to three groups (20 per group). In the experimental group, the smear layer was removed by Er,Cr:YSGG laser with 1.25 watts radiated power, pulse repetition rate of 50 Hz, 60 µs pulse duration, 80% water, and 30% air distribution, H-mode, and followed by diode laser 940 nm, which was operated at 1 W, as a continuous wave irradiation. In the conventional group, the smear layer was removed using EDTA 17%. In the control group, the smear layer was not removed. Two teeth from each group were randomly selected for scanning electron microscopy examination, and from each of the other samples, three slices with 1.0 ± 0.1 mm of thickness were cut and each hole was filled with Biodentine. Then, the specimens were immersed in the simulated body fluid (SBF) for 27 days. Using a universal testing machine, the bonding force for dislodgment of filling materials during the push-out test was calculated. Then, a stereomicroscope was used to assess the bond failure mode of Biodentine filling material at × 40. The debonding force in the control, conventional, and experimental groups was 5.3 ± 2.7, 5.4 ± 3.1, and 5.4 ± 2.5 MPs, respectively (p = 0.9). Also, laser and chemicals removed the smear layer effectively. The results of this study showed that, despite the smear layer removal, the push-out bond strength between Biodentine and root canal dentinal wall was not influenced by 17% EDTA + 5% NaOCl and Er,Cr:YSGG + diode lasers irradiation.
Objective: Root canal anatomy significantly impacts the working length determination. This study ... more Objective: Root canal anatomy significantly impacts the working length determination. This study aimed to investigate the effect of the preflaring technique on the accuracy of four electronic apex locators. Methods: Forty-five single-canal central maxillary teeth were selected. The working length was measured before and after the coronal preparation by four types of electronic apex locators in the range of ±0.5 and ±1 mm matched for the apical constriction. The actual working length was calculated under a microscope. Data were analyzed using ICC and paired t-tests in SPSS16. A p < 0.05 was considered significant. Results: The accuracies of Root ZX, DTE, Denjoy, and Coxo apex locators in the range of ± 0.05 mm were 71.1, 93.3, 84.4, and 75.6% before preflaring, and 82.2, 93.3, 97.8, and 100% after that. The corresponding values in the range of ±1 mm were 86.7, 97.8, 93.3, and 100% before and 97.8, 100, 100, and 100% after preflaring. Significant differences were found between the ...
Background: Oral cancer is one of the most prevailing neoplasms globally, and human papillomaviru... more Background: Oral cancer is one of the most prevailing neoplasms globally, and human papillomavirus (HPV) is one of the risk factors for this condition. Knowledge and awareness about HPV-related oral cancer can lead to a better diagnosis and prognosis of this disease. This systematic review aimed to evaluate knowledge and awareness about HPV-related oral cancer among dentists and dental students. Methods: We searched Web of Science, Scopus, PubMed, and ProQuest databases with Medical Subject Headings (MeSH) and non-MeSH keywords to find related articles. Our eligibility criteria were: 1) cross-sectional studies including knowledge and awareness about HPV-related oral cancers, 2) publication date up to August 18, 2021, 3) studies containing dentists or dental students as the main participants, or as part of the participants. The Joanne Briggs Institute (JBI) checklist was used for quality assessment. Results: A total of 10 studies were included in this systematic review. Five studies ...
Introduction: Lasers and optics have been used extensively in dental procedures in recent years, ... more Introduction: Lasers and optics have been used extensively in dental procedures in recent years, and realizing the optical properties of the tooth is also an essential in its successful applications. The aim of this study was to compare the absorption and transmission of applied wavelengths in the range of 190–1100 nm at different dentin thicknesses and the effect of changing the direction of radiation emission on the dentin tubules. Methods: There were fifteen dentin specimens with thicknesses of 300, 600, and 1000 mm, five specimens for each thickness, prepared through a transverse section of the coronal dentin over the pulpal roof area of human molars. Considering the coronal-apical and apical-coronal directions, we measured the absorption and transmission of parallel light rays perpendicular to the dentin samples in different thicknesses and two directions with a Cecil CE 7400 UV/Vis spectrometer. Data analysis was performed using SPSS software version 19. P value<0.05 was co...
The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pa... more The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pandemic, dentistry could be considered as one of the most high-risk medical sectors for health workers due to the high exposure to patients infected with this deadly virus. After the decline of the steep prevalence of COVID-19 cases, the dental associations have allowed dental offices to reopen under special circumstances by taking the necessary precautions and following the prescribed guidelines to keep both the dentists and their patients safe and healthy during the treatment. The aim of this review is to present a policy to manage and facilitate the dental procedures in the dental practice routine amid coronavirus by focusing on the patients' risk level in order to keep the possibility of COVID-19 transmission to a minimum.
This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine ... more This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine between laser-assisted endodontic preparation and conventional method of preparation in which the smear layer was removed using sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic (EDTA). Sixty single-rooted teeth were used which were decoronated and endodontically prepared. The teeth were then randomly assigned to three groups (20 per group). In the experimental group, the smear layer was removed by Er,Cr:YSGG laser with 1.25 watts radiated power, pulse repetition rate of 50 Hz, 60 µs pulse duration, 80% water, and 30% air distribution, H-mode, and followed by diode laser 940 nm, which was operated at 1 W, as a continuous wave irradiation. In the conventional group, the smear layer was removed using EDTA 17%. In the control group, the smear layer was not removed. Two teeth from each group were randomly selected for scanning electron microscopy examination, and from each of the ot...
The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pa... more The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pandemic, dentistry could be considered as one of the most high-risk medical sectors for health workers due to the high exposure to patients infected with this deadly virus.After the decline of the steep prevalence of COVID -19 cases, the dental associations have allowed dental offices to reopen under special circumstances by taking the necessary precautions and following the prescribed guidelines to keep both the dentists and their patients safe and healthy during the treatment. The aim of this review is to present a policy to manage and facilitate the dental procedures in the dental practice routine amid coronavirus by focusing on the patients’ risk level in order to keep the possibility of COVID -19 transmission to a minimum.
This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine ... more This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine between laser-assisted endodontic preparation and conventional method of preparation in which the smear layer was removed using sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic (EDTA). Sixty single-rooted teeth were used which were decoronated and endodontically prepared. The teeth were then randomly assigned to three groups (20 per group). In the experimental group, the smear layer was removed by Er,Cr:YSGG laser with 1.25 watts radiated power, pulse repetition rate of 50 Hz, 60 µs pulse duration, 80% water, and 30% air distribution, H-mode, and followed by diode laser 940 nm, which was operated at 1 W, as a continuous wave irradiation. In the conventional group, the smear layer was removed using EDTA 17%. In the control group, the smear layer was not removed. Two teeth from each group were randomly selected for scanning electron microscopy examination, and from each of the other samples, three slices with 1.0 ± 0.1 mm of thickness were cut and each hole was filled with Biodentine. Then, the specimens were immersed in the simulated body fluid (SBF) for 27 days. Using a universal testing machine, the bonding force for dislodgment of filling materials during the push-out test was calculated. Then, a stereomicroscope was used to assess the bond failure mode of Biodentine filling material at × 40. The debonding force in the control, conventional, and experimental groups was 5.3 ± 2.7, 5.4 ± 3.1, and 5.4 ± 2.5 MPs, respectively (p = 0.9). Also, laser and chemicals removed the smear layer effectively. The results of this study showed that, despite the smear layer removal, the push-out bond strength between Biodentine and root canal dentinal wall was not influenced by 17% EDTA + 5% NaOCl and Er,Cr:YSGG + diode lasers irradiation.
Objective: Root canal anatomy significantly impacts the working length determination. This study ... more Objective: Root canal anatomy significantly impacts the working length determination. This study aimed to investigate the effect of the preflaring technique on the accuracy of four electronic apex locators. Methods: Forty-five single-canal central maxillary teeth were selected. The working length was measured before and after the coronal preparation by four types of electronic apex locators in the range of ±0.5 and ±1 mm matched for the apical constriction. The actual working length was calculated under a microscope. Data were analyzed using ICC and paired t-tests in SPSS16. A p < 0.05 was considered significant. Results: The accuracies of Root ZX, DTE, Denjoy, and Coxo apex locators in the range of ± 0.05 mm were 71.1, 93.3, 84.4, and 75.6% before preflaring, and 82.2, 93.3, 97.8, and 100% after that. The corresponding values in the range of ±1 mm were 86.7, 97.8, 93.3, and 100% before and 97.8, 100, 100, and 100% after preflaring. Significant differences were found between the ...
Background: Oral cancer is one of the most prevailing neoplasms globally, and human papillomaviru... more Background: Oral cancer is one of the most prevailing neoplasms globally, and human papillomavirus (HPV) is one of the risk factors for this condition. Knowledge and awareness about HPV-related oral cancer can lead to a better diagnosis and prognosis of this disease. This systematic review aimed to evaluate knowledge and awareness about HPV-related oral cancer among dentists and dental students. Methods: We searched Web of Science, Scopus, PubMed, and ProQuest databases with Medical Subject Headings (MeSH) and non-MeSH keywords to find related articles. Our eligibility criteria were: 1) cross-sectional studies including knowledge and awareness about HPV-related oral cancers, 2) publication date up to August 18, 2021, 3) studies containing dentists or dental students as the main participants, or as part of the participants. The Joanne Briggs Institute (JBI) checklist was used for quality assessment. Results: A total of 10 studies were included in this systematic review. Five studies ...
Introduction: Lasers and optics have been used extensively in dental procedures in recent years, ... more Introduction: Lasers and optics have been used extensively in dental procedures in recent years, and realizing the optical properties of the tooth is also an essential in its successful applications. The aim of this study was to compare the absorption and transmission of applied wavelengths in the range of 190–1100 nm at different dentin thicknesses and the effect of changing the direction of radiation emission on the dentin tubules. Methods: There were fifteen dentin specimens with thicknesses of 300, 600, and 1000 mm, five specimens for each thickness, prepared through a transverse section of the coronal dentin over the pulpal roof area of human molars. Considering the coronal-apical and apical-coronal directions, we measured the absorption and transmission of parallel light rays perpendicular to the dentin samples in different thicknesses and two directions with a Cecil CE 7400 UV/Vis spectrometer. Data analysis was performed using SPSS software version 19. P value<0.05 was co...
The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pa... more The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pandemic, dentistry could be considered as one of the most high-risk medical sectors for health workers due to the high exposure to patients infected with this deadly virus. After the decline of the steep prevalence of COVID-19 cases, the dental associations have allowed dental offices to reopen under special circumstances by taking the necessary precautions and following the prescribed guidelines to keep both the dentists and their patients safe and healthy during the treatment. The aim of this review is to present a policy to manage and facilitate the dental procedures in the dental practice routine amid coronavirus by focusing on the patients' risk level in order to keep the possibility of COVID-19 transmission to a minimum.
This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine ... more This study compared the effect(s) of smear layer removal on push-out bond strength of Biodentine between laser-assisted endodontic preparation and conventional method of preparation in which the smear layer was removed using sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic (EDTA). Sixty single-rooted teeth were used which were decoronated and endodontically prepared. The teeth were then randomly assigned to three groups (20 per group). In the experimental group, the smear layer was removed by Er,Cr:YSGG laser with 1.25 watts radiated power, pulse repetition rate of 50 Hz, 60 µs pulse duration, 80% water, and 30% air distribution, H-mode, and followed by diode laser 940 nm, which was operated at 1 W, as a continuous wave irradiation. In the conventional group, the smear layer was removed using EDTA 17%. In the control group, the smear layer was not removed. Two teeth from each group were randomly selected for scanning electron microscopy examination, and from each of the ot...
The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pa... more The COVID-19 outbreak has led to increasing global concerns about infection control. Amid this pandemic, dentistry could be considered as one of the most high-risk medical sectors for health workers due to the high exposure to patients infected with this deadly virus.After the decline of the steep prevalence of COVID -19 cases, the dental associations have allowed dental offices to reopen under special circumstances by taking the necessary precautions and following the prescribed guidelines to keep both the dentists and their patients safe and healthy during the treatment. The aim of this review is to present a policy to manage and facilitate the dental procedures in the dental practice routine amid coronavirus by focusing on the patients’ risk level in order to keep the possibility of COVID -19 transmission to a minimum.
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