1,721,073 research outputs found
1,4-Conjugate addition of the Reformatsky reagent to a-nitrostyrenes: a new synthesis of g-nitroesters
No full text1,4-Conjugate addition of the Reformatsky reagent to alpha-nitrostyrenes: A new synthesis of gamma-nitroesters
No full textalpha-Nitrostyrenes react with the Reformatsky reagent to yield the corresponding 1,4-addition products. The reaction represents a practical and convenient route to ethyl 3-aryl-4-nitrobutanoates
Formazione di legami C-C via reagenti organometallici: il caso delle 2-alchil-4,6-dieteroalchil-1,3,5-triazine
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Impiego del Pd/C per il cross-coupling tra 2-cloro-4,6-dialcossi-1,3,5-triazine ed alch-1-ini
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Palladium on carbon catalyzed cross-coupling between alk-1-ynes and 2-chloro-4,6-dialkoxy-1,3,5-triazines
No full text2-(Alk-1'-ynyl)-4,6-dialkoxy-1,3,5-triazines have been synthesized in satisfactory yields by (Pd/C)/PPh3/CuI catalyzed cross-coupling between alk-1-ynes and 2-chloro-4,6-dialkoxy-1,3,5-triazines carried out in the presence of diisopropylethylamine or K2CO3/18-crown-6. (C) 2002 Elsevier Science Ltd. All rights reserved
2-(Alk-1 '-ynyl)-4,6-dimethoxy-1,3,5-triazines via Pd-mediated alkynylation of 2-chloro-4,6-dimethoxy-1,3,5-triazine
No full textIn the presence of a catalytic amount of (Ph3P)(4)Pd, 2-chloro-4,6-dimethoxy-1,3,5-triazine reacts with alk-1-ynes to give the corresponding 2-(alk-1'-ynyl)-derivatives in satisfactory yields. Depending on the nature of the alk-1-ynes, Pd(10%)/C can also be used to catalyze the cross-coupling. (C) 1999 Elsevier Science Ltd. All rights reserved
Endoscopic-assisted non surgical periodontal therapy: radiographic evaluation of infrabony defect response. A pilot study.
No full textThe goal of non surgical therapy is to remove subgingival biofilm and a minimally invasive endoscopic treatment of subgingival areas allows a significant improvement of deposits removal.
The aim of this study is to analyze the radiographic response of infrabony defects after non surgical periodontal therapy performed with a periodontal endoscope.
Twenty-three sites, belonging to 13 patients (7 females and 6 males, mean ± SD = 50±11 years), were analyzed after endoscopic-assisted* non surgical periodontal therapy. All patients were affected by chronic periodontitis, with moderate (probing depth – PD: 5-6 mm) or deep (PD:≥7mm) pockets and vertical infrabony defects affecting single – rooted teeth.
All sites were treated with endoscopic-assisted scaling and root planing (S-RP) and standardized x-rays were taken before and one year after the treatment. Radiographs were scanned and evaluated using an image analyzer.
The following measurements were taken: the distance between interproximal cementoenamel junction (CEJ) and base of the defect (BD), the distance between bone crest (BC) and BD, the angle of the defect and the Infrabony Defect Fill (IDF) (measured as the difference between initial and final vertical distance from CEJ to BD).
Results, one year after the procedure, show a statistically significant (p=0.0001) mean reduction of CEJ-BD and BC-BD distances, respectively 1.13 (0.68-1.59) mm and 0.82 (0.42-1.22) mm, and a statistically significant (p=0.03) mean increase of the defect angle: 6.29 mm (0.67-11.92). Moreover, the mean value of IDF fill was 1.14 ± 0.22 mm, denoting an infrabony defect fill.
Bone remodeling, occurred after non surgical endoscopic-assisted periodontal therapy, led to a partial fill of the defect and an increase of the defect angle, due to a remineralization of the most apical part of the defect. Taking advantage of the regenerative potential present in the area, the vertical defect partially turned into a horizontal defect.
This procedure brings predictable improvements in the radiographic parameters of infrabony defects versus S-RP alone.
Periodontal endoscopic-assisted non surgical therapy achieves a statistically significant decrease of the vertical component of the bony defects and the opening of the defect angle.
This procedure seems to be a reliable treatment for patients with a medical history or other psychological/economical concerns limiting a surgical approach
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