A CBCT evaluation of molar uprighting by conventional versus microimplant-assisted methods: an in-vivo study

Abstract

Objective: The aim of this prospective study was to compare the three-dimensional effects of the conventional helical uprighting spring (CA) and the mini-implant assisted helical uprighting spring (MIA), using CBCT scans. Methods: Twenty patients with mesially tipped second mandibular molars were divided into two groups: CA group, in which 10 patients were treated using a conventional helical uprighting spring with conventional anchorage; and MIA group, in which 10 patients were treated using a mini-implant supported uprighting spring. Molar uprighting was observed in both groups for a period of four months. Two standardized 11×5-cm CBCT sections of the mandible were taken, being one prior to uprighting and one at the end of the four month follow-up. Statistical analyses at the beginning of treatment and after a 4 month follow-up were performed, with a significance level of p< 0.05.Results: The mean amount of change in mesiodistal angulation in the MIA group was 8.53 ± 2.13o (p< 0.001) and in the CA group was 9.8 ± 0.5o (p< 0 .001). Statistically significant differences were found between the two groups with regard to buccolingual inclination of canine, first and second premolars (p< 0.05), second molar (p< 0.001) and extrusion of second molar (p< 0.05). Conclusions: The mean amount of change in the mesial angulation of the second molar in the CA as well as the MIA groups was similar. MIA, which used mini-implant as a source of anchorage, was more effective in preventing movement of the anchorage teeth as well as preventing extrusion of the second molar in the vertical plane, when compared to the CA group, which used dental units as a source of anchorage.

Verticalização de molar com uso de mini implante cabeça de braquete com rosca invertida: Relato de caso

“…Na literatura, são inúmeros os dispositivos utilizados para essa finalidade, porém, com alguma deficiência de controle do ponto de vista mecânico. Diferentes autores apontaram que uma quantidade significativa de extrusão molar, bem como um movimento de intrusão significativo da unidade de ancoragem podem ocorrer quando se é utilizado apenas uma sequência de fios, ou no uso de cantilever (Martires, et al, 2018).…”

Die kieferorthopädische Aufrichtung gekippter Molaren

“…Die reaktiv entstehenden Momente können dabei ein Vielfaches der Größe des aufrichtenden Moments betragen 28 . Abhängig von der verwendeten Mechanik sind bei der Verwendung konventioneller Aufrichtefedern und dentaler Verankerung häufig eine Bukkalbewegung und Bukkalneigung des Verankerungssegments zu beobachten 33 34 . Zur Kontrolle der auftretenden reaktiven Kräfte und Momente ist daher eine Verankerungsplanung erforderlich.…”

“…Parodontal geschädigte Zähne weisen lediglich eine reduzierte Verankerungsqualität auf 16 . Wenn keine reaktiven Kräfte und Momente auf andere Zähne übertragen werden sollen, können Mini-Implantate zur Verankerung eingesetzt werden 1 2 17 21 32 33 37 .…”

Efficacy of Miniscrews in Gaining Prosthetic Space for a Dental Implant to Replace the Mandibular First Molar: A Case Series

“…First molars are the first permanent teeth to erupt and play a fundamental role in maintaining the shape of the dental arch and adequate occlusal schemes. The early loss of mandibular first molars is fairly common among adult patients, as these teeth are present in the oral cavity for longer and are thus more prone to caries, endodontic and periodontal problems, or vertical fracture [1], all due to poor oral hygiene maintenance [2,3]. The premature loss of a permanent first molar must be dealt with immediately to avoid functional and anatomical disorders.…”

“…The premature loss of a permanent first molar must be dealt with immediately to avoid functional and anatomical disorders. As a result of first molar loss, mesial inclination and rotation of the adjacent teeth can occur, which causes a reduction in the prosthetic space available for rehabilitation [2][3][4]. If the inclination is not corrected, this aggravates periodontal problems in mesially impacted molars, causing inflammation, angular bone loss, a periodontal pocket on the mesial aspect of the second molar, and increased plaque retention leading to interproximal caries [5][6][7][8].…”