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1.
Angle Orthod ; 83(6): 937-42, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23745980

RESUMO

OBJECTIVE: To compare the efficiency in anchorage preservation of conventional and self-ligating brackets after the extraction of first maxillary premolars using differential moment mechanics. MATERIALS AND METHODS: Thirty-eight patients requiring extraction of maxillary first premolars and maximum anchorage during space closure were evaluated based on bracket type. Group 1, comprising 23 patients, was bonded with preadjusted conventional brackets (CBs) with a slot of 0.022-inch × 0.030-inch. Group 2 comprised 15 patients who were bonded with 0.022 inch preadjusted self-ligating brackets (SLBs). Patients in both groups received a nickel titanium (NiTi) intrusion arch and a 150 g NiTi closing coil spring for separate canine retraction, followed by a continuous mushroom loop archwire to retract the incisors. Lateral cephalograms were available at the start of treatment (T1) and at the completion of space closure (T2). Statistical comparisons were performed with paired and unpaired Student's t-tests. RESULTS: No significant differences were found between the groups in maxillary molars anchorage loss (3.87 ± 1.35 mm and 3.65 ± 1.73 mm for the CB and SLB groups, respectively). Only the mean vertical movement of the tip of the incisor was significantly different between the groups (CB  =  -0.92 ± 1.46 mm; SLB  =  0.56 ± 1.65 mm). CONCLUSION: There were no significant differences in the amount of anchorage loss of the maxillary first molars between SLB and CB systems during space closure using differential moments.


Assuntos
Procedimentos de Ancoragem Ortodôntica/instrumentação , Braquetes Ortodônticos , Técnicas de Movimentação Dentária/instrumentação , Adolescente , Dente Pré-Molar , Cefalometria , Criança , Feminino , Humanos , Masculino , Maxila , Procedimentos de Ancoragem Ortodôntica/métodos , Desenho de Aparelho Ortodôntico , Estudos Retrospectivos , Extração Dentária , Técnicas de Movimentação Dentária/métodos , Adulto Jovem
2.
Eur J Orthod ; 35(5): 568-76, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22898749

RESUMO

The purpose of this study was to measure the efficacy of anchorage control between differential moments mechanics and temporary anchorage devices in a clinical trial. Forty-six patients requiring extraction of maxillary first premolars were allocated into 2 treatment groups. The differential moments group (G1) received a nickel titanium (NiTi) intrusion arch and a 150g NiTi closing coil spring for separate canine retraction, followed by a continuous mushroom loop archwire for the retraction of the incisors. The TAD group (G2) received one miniscrew placed between maxillary second premolars and first molars with a 150 g NiTi closing coil spring connecting the miniscrew to a hook placed in the archwire between the lateral incisor and canine. Lateral cephalograms were taken before (T1) and after incisor retraction (T2). The ratio of molar protraction to incisor retraction was calculated and intragroup and intergroup changes in upper lip, maxillary incisor and molar position were analyzed by paired and independent t-tests. Twenty-eight patients were analyzed after 18 patients did not receive the intervention, were lost to follow-up, or discontinued treatment. The ratio of molar protraction to incisor retraction in G1 was 0.44 and in G2 was -0.11, which was significantly different. There was a statistically significant change in upper lip from T1 to T2 but no difference between the two groups. Moreover, there was a significant distal molar tipping and lingual incisor tipping in G2. There is a significant difference in the amount of anchorage control using differential moments mechanics compared to TADs. Although statistically significant retraction of upper lip was observed in both groups, there was no significant difference between the two groups.


Assuntos
Parafusos Ósseos , Procedimentos de Ancoragem Ortodôntica , Técnicas de Movimentação Dentária , Adulto , Dente Pré-Molar/cirurgia , Cefalometria , Feminino , Humanos , Incisivo/cirurgia , Masculino , Maxila/cirurgia , Dente Molar/cirurgia , Níquel , Estudos Prospectivos , Titânio , Adulto Jovem
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