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1.
BMC Oral Health ; 20(1): 350, 2020 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-33261594

RESUMO

BACKGROUND: This is a retrospective study that compares mandibular growth changes in skeletal Class II patients treated by rapid maxillary expansion (RME) and following fixed appliance with those patients treated by Twin-Block (TB) and following fixed appliance. METHODS: Fourteen patients treated by RME and following fixed appliance were included into the RME group. Fifteen patients treated by Twin-Block and following fixed appliance were included into the TB group. Lateral cephalometric radiographs taken before treatment and immediately after fixed appliance treatment were used to evaluate mandibular growth effects. RESULTS: The starting forms of the patients in the two groups were examined to be of good comparability. The mandibular length increased significantly in both groups as measured by Co-Gn, Go-Gn and Ar-Gn, but the TB group didn't show more mandibular growth than the RME group (P > 0.05). Skeletal changes of the mandible in vertical dimension were different in the two groups. The change in FMA was 0.35° in the RME group, while the change was 2.65° in the TB group (P < 0.001). The change in LAFH was 5.14 mm in the RME group, significantly smaller than the change of 10.19 mm in the TB group (P < 0.001). CONCLUSION: The investigated Phase I treatment with RME followed by Phase II treatment of fixed appliance achieved the same increases in sagittal mandibular growth and facial profile improvements as the Twin-Block therapy. The treatment with RME followed by fixed appliance was better for vertical control, while the treatment with Twin-Block followed by fixed appliance significantly increased the mandibular plane angle.

2.
Acta Crystallogr Sect E Struct Rep Online ; 65(Pt 12): m1535, 2009 Nov 07.
Artigo em Inglês | MEDLINE | ID: mdl-21578577

RESUMO

The Ag(I) atom in the salt, [Ag(C(4)H(6)N(2))(2)]NO(3)·2H(2)O, shows a nearly linear coordination [N-Ag-N = 178.26 (7)°]. The cation, anion and water mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds into a layer motif extending parallel to (101).

3.
Acta Crystallogr Sect E Struct Rep Online ; 65(Pt 12): m1543, 2009 Nov 07.
Artigo em Inglês | MEDLINE | ID: mdl-21578583

RESUMO

The three-dimensional coordination polymer, [Mn(2)(C(12)H(6)O(4))(2)(C(12)H(6)N(2)O(2))(H(2)O)](n), features a water-coord-inated Mn(II) ion and an N-heterocycle-chelated Mn(II) ion, both in six-coordinate octa-hedral geometries. Of the two rigid dianions, one is bonded to four Mn(II) ions, with each of the O atoms being connected to a different metal ion. The other dianion uses one carboxyl-ate group to chelate to one Mn(II) ion and its other carboxyl-ate group to bind to two Mn(II) ions.

4.
Acta Crystallogr Sect E Struct Rep Online ; 65(Pt 12): m1544, 2009 Nov 07.
Artigo em Inglês | MEDLINE | ID: mdl-21578584

RESUMO

The Pb(II) atom in the polymeric title compound, [Pb(C(8)H(4)O(4))(C(12)H(6)N(2)O(2))](n), is chelated by the N-heterocycle, and adjacent atoms are bridged by rigid terephthalate dianions into a linear chain. The Pb(II) atom is stereochemically active in a ψ-square-pyramidal coordination geometry in which the lone-pair electrons occupy a basal site. When three other weaker Pb⋯O inter-actions are considered, the geometry is a ψ-dodeca-hedron.

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