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Peter Judd - One of the best experts on this subject based on the ideXlab platform.
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comparison of Ferric Sulfate combined mineral trioxide aggregate pulpotomy and zinc oxide eugenol pulpectomy of primary maxillary incisors an 18 month randomized controlled trial
Pediatric Dentistry, 2017Co-Authors: Trang D Nguyen, Peter Judd, Edward J Barrett, Nicole Sidhu, Michael J CasasAbstract:Purpose The purpose of this study was to compare outcomes and survival of Ferric Sulfate with mineral trioxide aggregate (FS+MTA) pulpotomy and root canal therapy (RCT) in carious vital primary maxillary incisors. Methods In this parallel group noninferiority trial, asymptomatic carious vital primary incisors with pulp exposure in healthy 18- to 46-month-olds were allocated randomly to receive FS+MTA pulpotomy or RCT between September 2010 and September 2012. Each incisor was classified into one of the following radiographic outcomes: N (incisor without pathologic change); Po (pathologic change present, follow-up recommended); Px (pathologic change present, extract.) Clinical findings and incisor survival were secondary outcomes. Results Seventy subjects were enrolled with a total of 172 incisors. Twelve- and 18-month radiographic outcomes demonstrated no statistical difference between FS+MTA pulpotomy and RCT incisors for Px outcomes (P=0.38; odds ratio equals 0.60; 95 percent confidence interval equals 0.19 to 1.89; chi-square test). There was no statistical differences in clinical outcomes for FS+MTA pulpotomy and RCT at 12 and 18 months (P=0.51; Fisher's exact test) or survival for FS+MTA pulpotomy and RCT incisors (P=0.11; log-rank test). Conclusions Ferric Sulfate with Mineral Trioxide Aggregate (FS+MTA) is an alternative to RCT for vital primary incisors.
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mineral trioxide aggregate produces superior outcomes in vital primary molar pulpotomy
Pediatric Dentistry, 2010Co-Authors: Tracy L Doyle, Michael J Casas, David J Kenny, Peter JuddAbstract:PURPOSE The purpose of this study was to investigate the outcomes of vital primary molar pulpotomy when there is no direct contact between eugenol and the vital pulp. Four pulpotomy techniques were compared: (1) Ferric Sulfate (FS) pulpotomy; (2) eugenol-free FS pulpotomy; (3) mineral trioxide aggregate (MTA) pulpotomy; and (4) FS/MTA pulpotomy. METHODS The pulpotomy technique assigned to each molar was determined by random selection. Two blinded, disinterested raters classified each molar into 1 of 3 radiographic outcomes: (1) N=normal molar without pathologic change; (2) Po=pathologic change present, follow-up recommended; (3) Px=pathologic change present, extract. RESULTS A total of 92 patients with 227 pulpotomy-treated molars returned for at least 1 recall examination. Median follow-up for molars was 24 months (range=12-38 months). MTA molars demonstrated significantly fewer Px radiographic outcomes than FS molars (P=.002, chi-square test). Eugenol-free FS molars demonstrated significantly more Px radiographic outcomes than MTA (P<.001, chi-square test) or FS/MTA (P=.002, chi-square test) molars. Significantly lower survival was demonstrated for eugenol-free FS molars compared to MTA molars (P=.02, log-rank test) over 6 to 38 months. CONCLUSIONS Outcomes for mineral trioxide aggregate pulpotomy were superior to Ferric Sulfate and eugenol-free Ferric Sulfate pulpotomy after a median follow-up of 2 years.
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Long-term outcomes of primary molar Ferric Sulfate pulpotomy and root canal therapy.
Pediatric Dentistry, 2003Co-Authors: Michael J Casas, Douglas H Johnston, Michael A Layug, David J Kenny, Peter JuddAbstract:Purpose: The objective of this outcome study was to compare Ferric Sulfate pulpotomy (FS) and primary tooth root canal therapy (RCT) on cariously exposed vital pulps of primary molars. Methods: A total of 291 molars were treated in 130 children—182 molars received FS and 109 received RCT by random selection. Results: At 2-year reassessment, 116 molars (73 FS, 43 RCT) were available for clinical and radiographic examination. There was no clinical evidence of pathosis in 96% of FS and 98% of RCT molars. Two independent pediatric dentists evaluated periapical radiographs of the treated molars. Molars were classified into 1 of 4 outcomes: (1) N—normal treated molar, (2) H—nonpathologic radiographic change present, (3) P O — pathologic change present, follow-up in 6 months, and (4) P X —pathologic change present, extract immediately. Survival analysis was applied. A good level of agreement between raters was found for molars with outcome P X (κ=0.745). Intrarater reliability was good for molars with outcome P X (κ=0.710). Significantly greater numbers of FS than RCT molars were rated P X at the 2-year recall (χ 2 =5.8; P=.02). No significant difference in survival between the 2 types of vital pulp treatments was detected in log rank tests (P=.22). Conclusions: Outcomes for FS were poorer than RCT outcomes at 2 years; however, at 2 years, the survival rates were not statistically different. (Pediatr Dent. 2003:25:97-102)
Michael J Casas - One of the best experts on this subject based on the ideXlab platform.
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comparison of Ferric Sulfate combined mineral trioxide aggregate pulpotomy and zinc oxide eugenol pulpectomy of primary maxillary incisors an 18 month randomized controlled trial
Pediatric Dentistry, 2017Co-Authors: Trang D Nguyen, Peter Judd, Edward J Barrett, Nicole Sidhu, Michael J CasasAbstract:Purpose The purpose of this study was to compare outcomes and survival of Ferric Sulfate with mineral trioxide aggregate (FS+MTA) pulpotomy and root canal therapy (RCT) in carious vital primary maxillary incisors. Methods In this parallel group noninferiority trial, asymptomatic carious vital primary incisors with pulp exposure in healthy 18- to 46-month-olds were allocated randomly to receive FS+MTA pulpotomy or RCT between September 2010 and September 2012. Each incisor was classified into one of the following radiographic outcomes: N (incisor without pathologic change); Po (pathologic change present, follow-up recommended); Px (pathologic change present, extract.) Clinical findings and incisor survival were secondary outcomes. Results Seventy subjects were enrolled with a total of 172 incisors. Twelve- and 18-month radiographic outcomes demonstrated no statistical difference between FS+MTA pulpotomy and RCT incisors for Px outcomes (P=0.38; odds ratio equals 0.60; 95 percent confidence interval equals 0.19 to 1.89; chi-square test). There was no statistical differences in clinical outcomes for FS+MTA pulpotomy and RCT at 12 and 18 months (P=0.51; Fisher's exact test) or survival for FS+MTA pulpotomy and RCT incisors (P=0.11; log-rank test). Conclusions Ferric Sulfate with Mineral Trioxide Aggregate (FS+MTA) is an alternative to RCT for vital primary incisors.
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mineral trioxide aggregate produces superior outcomes in vital primary molar pulpotomy
Pediatric Dentistry, 2010Co-Authors: Tracy L Doyle, Michael J Casas, David J Kenny, Peter JuddAbstract:PURPOSE The purpose of this study was to investigate the outcomes of vital primary molar pulpotomy when there is no direct contact between eugenol and the vital pulp. Four pulpotomy techniques were compared: (1) Ferric Sulfate (FS) pulpotomy; (2) eugenol-free FS pulpotomy; (3) mineral trioxide aggregate (MTA) pulpotomy; and (4) FS/MTA pulpotomy. METHODS The pulpotomy technique assigned to each molar was determined by random selection. Two blinded, disinterested raters classified each molar into 1 of 3 radiographic outcomes: (1) N=normal molar without pathologic change; (2) Po=pathologic change present, follow-up recommended; (3) Px=pathologic change present, extract. RESULTS A total of 92 patients with 227 pulpotomy-treated molars returned for at least 1 recall examination. Median follow-up for molars was 24 months (range=12-38 months). MTA molars demonstrated significantly fewer Px radiographic outcomes than FS molars (P=.002, chi-square test). Eugenol-free FS molars demonstrated significantly more Px radiographic outcomes than MTA (P<.001, chi-square test) or FS/MTA (P=.002, chi-square test) molars. Significantly lower survival was demonstrated for eugenol-free FS molars compared to MTA molars (P=.02, log-rank test) over 6 to 38 months. CONCLUSIONS Outcomes for mineral trioxide aggregate pulpotomy were superior to Ferric Sulfate and eugenol-free Ferric Sulfate pulpotomy after a median follow-up of 2 years.
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Long-term outcomes of primary molar Ferric Sulfate pulpotomy and root canal therapy.
Pediatric Dentistry, 2003Co-Authors: Michael J Casas, Douglas H Johnston, Michael A Layug, David J Kenny, Peter JuddAbstract:Purpose: The objective of this outcome study was to compare Ferric Sulfate pulpotomy (FS) and primary tooth root canal therapy (RCT) on cariously exposed vital pulps of primary molars. Methods: A total of 291 molars were treated in 130 children—182 molars received FS and 109 received RCT by random selection. Results: At 2-year reassessment, 116 molars (73 FS, 43 RCT) were available for clinical and radiographic examination. There was no clinical evidence of pathosis in 96% of FS and 98% of RCT molars. Two independent pediatric dentists evaluated periapical radiographs of the treated molars. Molars were classified into 1 of 4 outcomes: (1) N—normal treated molar, (2) H—nonpathologic radiographic change present, (3) P O — pathologic change present, follow-up in 6 months, and (4) P X —pathologic change present, extract immediately. Survival analysis was applied. A good level of agreement between raters was found for molars with outcome P X (κ=0.745). Intrarater reliability was good for molars with outcome P X (κ=0.710). Significantly greater numbers of FS than RCT molars were rated P X at the 2-year recall (χ 2 =5.8; P=.02). No significant difference in survival between the 2 types of vital pulp treatments was detected in log rank tests (P=.22). Conclusions: Outcomes for FS were poorer than RCT outcomes at 2 years; however, at 2 years, the survival rates were not statistically different. (Pediatr Dent. 2003:25:97-102)
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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preparation of biodiesel from waste cooking oil via two step catalyzed process
Energy Conversion and Management, 2007Co-Authors: Yong Wang, Shiyi Ou, Pengzhan Liu, Zhisen ZhangAbstract:Abstract Waste cooking oils (WCO), which contain large amounts of free fatty acids produced in restaurants, are collected by the environmental protection agency in the main cities of China and should be disposed in a suitable way. In this research, a two step catalyzed process was adopted to prepare biodiesel from waste cooking oil whose acid value was 75.92 ± 0.036 mgKOH/g. The free fatty acids of WCO were esterified with methanol catalyzed by Ferric Sulfate in the first step, and the triglycerides (TGs) in WCO were transesterified with methanol catalyzed by potassium hydroxide in the second step. The results showed that Ferric Sulfate had high activity to catalyze the esterification of free fatty acids (FFA) with methanol, The conversion rate of FFA reached 97.22% when 2 wt% of Ferric Sulfate was added to the reaction system containing methanol to TG in10:1 (mole ratio) composition and reacted at 95 °C for 4 h. The methanol was vacuum evaporated, and transesterification of the remained triglycerides was performed at 65 °C for 1 h in a reaction system containing 1 wt% of potassium hydroxide and 6:1 mole ratio of methanol to TG. The final product with 97.02% of biodiesel, obtained after the two step catalyzed process, was analyzed by gas chromatography. This new process has many advantages compared with the old processes, such as no acidic waste water, high efficiency, low equipment cost and easy recovery of the catalyst.
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comparison of two different processes to synthesize biodiesel by waste cooking oil
Journal of Molecular Catalysis A-chemical, 2006Co-Authors: Yong Wang, Pengzhan Liu, Feng Xue, Shuze TangAbstract:Abstract The traditional acid and the new two-step catalyzed processes for synthesis of biodiesel expressed as fatty acid methyl ester (FAME) were comparatively studied to achieve an economic and practical method for utilization of waste cooking oil (WCO) from Chinese restaurants. WCO samples with the acid value of 75.92 ± 0.04 mgKOH/g mixed with methanol were catalyzed under 95 °C for various reaction time, followed by methanol recovery under vacuum (10 ± 1 mmHg) at 50 °C with a rotational evaporation. FAME analyzed by gas chromatography (GC) was obtained directly from sulfuric acid catalyzed reaction in the traditional acid method, whereas in the two-step method it was produced from Ferric Sulfate (2.0%) catalyzed reaction followed by alkali (1.0% potassium hydroxide) transesterification. The conversion of free fatty acids of WCO into FAME in the two-step method was 97.22% at the reaction time of 4 h, mole ratio of methanol to TG of 10:1, compared in the acid method with 90%, 10 h, and 20:1, respectively, showing much higher catalyzed activity of Ferric Sulfate. This new two-step process showed advantages of no acidic wastewater, high efficiency, low equipment cost, and easy recovery of catalyst compared with the limitations of acidic effluent, no reusable catalyst and high cost of equipment in the traditional acid process.
Abu T Khan - One of the best experts on this subject based on the ideXlab platform.
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hydrated Ferric Sulfate catalyzed synthesis of 5 6 unsubstituted 1 4 dihydropyridines using three component reaction
ChemInform, 2015Co-Authors: Kobirul Islam, Abu T Khan, Deb K DasAbstract:A wide variety of 5,6-unsubstituted 1,4-dihydropyridines derivatives (4a–q) were synthesized through a one-pot three-component reaction from a,b-unsaturated aldehydes, amines, and 1,3-diketones at room temperature using hydrated Ferric Sulfate as a Lewis acid catalyst. The key features of the present protocol are mild and simple reaction procedure, good to excellent yields, and use of inexpensive, recyclable, and environmentally benign catalyst.
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hydrated Ferric Sulfate catalyzed synthesis of 3 alkyl arylthio aryl methyl 1h indole derivatives through one pot reaction
ChemInform, 2014Co-Authors: Ajaz A Dar, Shahzad Ali, Abu T KhanAbstract:A one-pot three-component reaction of indoles, aromatic aldehydes, and a range of mercaptans in the presence of hydrated Ferric Sulfate as the catalyst gives 3-substituted indoles (IV) and (VII) in moderate yields.
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hydrated Ferric Sulfate catalyzed synthesis of 3 alkyl arylthio aryl methyl 1h indole derivatives through one pot reaction
Tetrahedron Letters, 2014Co-Authors: Ajaz A Dar, Shahzad Ali, Abu T KhanAbstract:A wide variety of 3-[(alkyl/arylthio)(aryl)methyl]-1H-indole derivatives (4a–z) were synthesized through a one-pot three-component reaction from indoles, aromatic aldehydes, and thiols at room temperature using hydrated Ferric Sulfate as a Lewis acid catalyst. The key features of the present protocol are mild and simple reaction procedure, moderate to good yields, requirement of inexpensive and reusable catalyst, no formation of dithioacetals derivatives from the corresponding aldehydes as well as bis-(indolyl) methane derivatives.
Oya Aktoren - One of the best experts on this subject based on the ideXlab platform.
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success rates of mineral trioxide aggregate Ferric Sulfate and formocresol pulpotomies a 24 month study
Pediatric Dentistry, 2011Co-Authors: Arzu Pinar Erdem, Yeliz Guven, B Balli, B Ilhan, Elif Sepet, I Ulukapi, Oya AktorenAbstract:PURPOSE The purpose of this study was to evaluate the total success rates of mineral trioxide aggregate (MTA), Ferric Sulfate (FS), and formocresol (FC) as pulpotomy agents in primary molars. METHODS A randomized, split-mouth study design was used in 32 healthy 5- to 7-year-old children with 128 carious primary molars without clinical or radiographic evidence of pulp degeneration. The pulpotomy agents were assigned as follows: Group 1=MTA; Group 2=FS; Group 3=1:5 diluted Buckley's FC; and Group 4=zinc oxide eugenol (ZOE) base. Clinical and radiographic follow-up at 6, 12, and 24 months used the following criteria: pain; swelling; sinus tract; mobility; internal root resorption; and furcation and/or periapical bone destruction. The data were analyzed using chi-square. RESULTS No significant differences in success rates were found among the groups at 6 and 12 months. Success rates in groups 1 to 4 at 24 months were 96%, 88%, 88%, and 68% respectively. There was a significant difference (P<.001) between the MTA and ZOE groups at 24 months. CONCLUSIONS ZOE, as the only pulpotomy medicament, had a significantly lower success rate than MTA. No significant differences were observed, among the 3 experimental materials (MTA, FC, and FS) at 2 years follow-up.
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success rates of mineral trioxide aggregate Ferric Sulfate and formocresol pulpotomies a 24 month study
Pediatric Dentistry, 2011Co-Authors: Arzu Pinar Erdem, Yeliz Guven, B Balli, B Ilhan, Elif Sepet, I Ulukapi, Oya AktorenAbstract:Abstract The purpose of this study was to evaluate the total success rates of mineral trioxide aggregate (MTA), Ferric Sulfate (FS), and formocresol (FC) as pulpotomy agents in primary molars. A randomized, split-mouth study design was used in 32 healthy 5- to 7-year-old children with 128 carious primary molars without clinical or radiographic evidence of pulp degeneration. The pulpotomy agents were assigned as follows: Group 1=MTA; Group 2=FS; Group 3=1:5 diluted Buckley's FC; and Group 4=zinc oxide eugenol (ZOE) base. Clinical and radiographic follow-up at 6, 12, and 24 months used the following criteria: pain; swelling; sinus tract; mobility; internal root resorption; and furcation and/or periapical bone destruction. The data were analyzed using chi-square. No significant differences in success rates were found among the groups at 6 and 12 months. Success rates in groups 1 to 4 at 24 months were 96%, 88%, 88%, and 68% respectively. There was a significant difference (P