Preliminary investigation of the biomechanics of internal fixation of sagittal split osteotomies with miniplates using a newly designed in vitro testing model

Armstrong, J.E.; Lapointe, Henry; Hogg, Nicolas J.V.; Kwok, Alvin D.

doi:10.1053/joms.2001.20492

Cited by 63 publications

(37 citation statements)

References 31 publications

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“…Alberts et al 19 studied the osseous strain pattern of the maxilla after Le fort I osteotomy and suggested that FEA had more advantages than the synthetic model analysis. Note, however, that Armstrong et al 20 cited its limitations based on an in vitro experiment. In this study, we hypothesized that the maxilla is of a homogenous, isotropic, and linearly elastic structure although it has various biomechanical characteristics.…”

Section: Kyoung In Yun Et Al: a Comparison Of Fixation Methods Using mentioning

confidence: 99%

A comparison of fixation methods using three-dimensional finite element analysis following anterior segmental osteotomy

Yun

Park

et al. 2012

J Korean Assoc Oral Maxillofac Surg

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(J Korean Assoc Oral Maxillofac Surg 2012;38:332-6) Objectives: This study sought to evaluate fixation methods and determine the best method for the postoperative stabilization of maxillary osteotomy. For our analysis we performed a three-dimensional finite element analysis of stress distribution on the plate, screw, and surrounding bone, as well as displacement onto the plate. Materials and Methods: We generated a model using synthetic skull scan data; an initital surface model was changed to a solid model using software. Modified anterior segmental osteotomy (using Park's method) was made using the program, and four different types of fixation methods were used. An anterior load of 100 N was applied on the palatal surface of two central incisors. Results:The Type 1 (L-shaped) fixation method gave stresses of 187.8 MPa at the plate, 45.8 MPa at the screw, and 15.4 MPa at the bone around the plate. The Type 2 (I-shaped) fixation method gave stresses of 186.6 MPa at the plate, 75.7 MPa at the screw, and 13.8 MPa at the bone around the plate. The Type 3 (inverted L-shaped) fixation method gave stresses of 28.6 MPa at the plate, 29.9 MPa at the screw, and 15.3 MPa at the bone around the plate. The Type 4 (I-shaped) fixation method gave stresses of 34.8 MPa at the plate, 36.9 MPa at the screw, and 14.9 MPa at the bone around the plate. The deflection of the plates for the four fixation methods was 0.014 mm, 0.022 mm, 0.017 mm, and 0.018 mm, respectively. Conclusion: The Type 3 (inverted L-shaped) fixation method offers more stability than the other fixation methods. We therefore recommend this method for the postoperative stabilization of maxillary osteotomy.

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Section: Kyoung In Yun Et Al: a Comparison Of Fixation Methods Using mentioning

confidence: 99%

A comparison of fixation methods using three-dimensional finite element analysis following anterior segmental osteotomy

Yun

Park

et al. 2012

J Korean Assoc Oral Maxillofac Surg

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“…Tests were carried out in an MTS 858 MiniBionix tester, using the loading confi guration proposed by Armstrong [6] and a system for three-point bending (Fig. 4).…”

Section: Methodsmentioning

confidence: 99%

“…4) fl exural rigidity is calculated from the following general relation: The models used in the tests were denoted as follows: P1 -the physiologically and anatomically normal model, P2 -the model with an osteosynthesis made with screws, P3 -the model with an osteosynthesis made with a 4-hole plate, P4 -the model with an osteosynthesis made with a 6-hole plate. [6] a b…”

Section: Methodsmentioning

confidence: 99%

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Assessment of rigidity and strength of selected osteosyntheses after bilateral sagittal split osteotomy

Stróżyk¹,

Szust²,

Nowak³

2008

Physiotherapy

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Streszczenie:Celem niniejszej pracy była doświadczalna ocena in vitro sztywności na zginanie i wytrzymałości wybranych zespoleń stosowanych do połączenia odłamów kostnych po wykonaniu obustronnej strzałkowej osteotomii gałęzi żuchwy. Ze względu na porównawczy charakter badań zdecydowano się na zastosowanie schematu obciążenia zaproponowanego przez Armstronga i układu do zginania trójpunktowego. Badania zostały przeprowadzone na poliuretanowych modelach ludzkiej żuchwy -jeden reprezentował anatomicznie i fi zjologicznie poprawny model żuchwy, a w pozostałych wykonano osteotomię wg Obwegesera, a następnie wykonano ich zespolenie. Do połączenia odłamów wykorzystano dwa rodzaje wkrętów i dwa rodzaje płytek do osteosyntezy, tj. 4-oczkową i 6-oczkową. Sztywność na zginanie wyznaczono na podstawie klasycznego równania linii ugięcia belki przy zginaniu trójpunktowym w zakresie obciążeń pooperacyjnych, natomiast do oceny wytrzymałości wykorzystano wartość maksymalnego obciążenia. Wykazano, że w modelach po osteotomii znacząco zmniejsza się sztywność i wytrzymałość w stosunku do modelu bez osteotomii.Słowa kluczowe: żuchwa ludzka, obustronna strzałkowa osteotomia gałęzi żuchwy, osteosynteza, mini płytki, bikortykalne wkręty, badanie biomechaniczne sztywności oraz wytrzymałości. Abstract:The aim of this research was to experimentally assess in vitro the conventional fl exural rigidity and strength of selected osteosyntheses employed to join bone fragments after bilateral sagittal split osteotomy. Because of the comparative nature of the research the loading confi guration proposed by Armstrong and the three-point bending system were used. Tests were carried out on polyurethane models of the human lower jaw. One model represented the anatomically and physiologically normal mandible while in the case of the other models Obwegeser osteotomies were performed and subsequently osteosynthesized. Two types of screws and two types of plates, i.e. a four-hole plate and a six-hole plate, were used to join the bone fragments. Conventional fl exural rigidity was determined using the classic beam bending line equation for three-point bending in the postoperative load range. The test results show that the conventional rigidity and strength of the osteotomized models are signifi cantly lower in comparison with the model without osteotomy.Key words: human mandible, bilateral sagittal split osteotomy, osteosyntheses, miniplates, biocortical srews, biomechanical rigidity and strength testing. WprowadzenieObustronna strzałkowa osteotomia gałęzi żuchwy (ang. bilateral sagittal split osteotomy -BSSO) jest podstawową procedurą stosowaną w chirurgii ortognatycznej w celu wykonania korekcji rozwojowych oraz nabytych wad dolnej żuchwy. Obecnie najbardziej powszechne są dwie metody łączenia przeciętych odłamów kości: 1) za pomocą śrub bikortykalnych, 2) za pomocą implantów, tzn. wszystkich rodzajów płytek. Literatura dotycząca wyników badań doświadczal-nych [1-3] odnosi się głównie do sposobów łączenia odłamów kości, ale rzadko można znaleźć (szczeg...

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“…Um modelo de três pontos, desenvolvido previamente num estudo permitiu a formação da curva carga versus deslocamento, além de gerar medidas reproduzíveis dos limites elásticos que puderam ser comparadas entre os diferentes tipos de fixação (Armstrong et al 2001). O referido modelo apresenta um ponto de carregamento com dois apoios, ou seja, um apoio na região dos côndilos, outro na região anterior, e por último, a carga é aplicada na região de ângulo mandibular onde se inserem as fibras do músculo masseter.…”

Section: Resultsunclassified

Estudo biomecânico comparativo de sistemas de fixação de 2,0-mm locking e convencionais em fraturas de ângulo em mandíbulas de cordeiro sob esforços em três eixos no espaço

Saavedra¹

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DEDICATÓRIAÀ Deus, por estar presente e iluminar meus passos durante minha vida e nesta caminhada.Ao São Josemaria Escrivá de Balaguer, fundador do Opus Dei, por guiar minhas atitudes em toda minha vida. Aos meus pais, Feliciano Alberto Nicodemo Saavedra e Lucia Helena deSiqueira Ferreira Anzaloni Saavedra pela oportunidade de estudar e me tornar um homem. Não foram apenas pais, mas amigos, companheiros, pois souberam me incentivar a prosseguir, com dignidade, nas horas em que meus ideais pareciam distantes.Ao meu irmão, Marcelo de Siqueira Ferreira Anzaloni Saavedra, pelo exemplo de determinação, como irmão mais velho e para a busca da realização dos meus sonhos.À minha cunhada Renata Maisao, pelo companheirismo, amizade e incentivo.Ao meu irmão Prof. Dr. Guilherme de Siqueira Ferreira Anzaloni Saavedra, pela amizade, carinho e ajuda na execução e conclusão do trabalho. Por ser praticamente meu segundo pai, um exemplo que sigo em minha vida e carreira.À minha cunhada Marina De Francesco Saavedra, pela amizade, companheirismo, ajuda em todos os sentidos, por ser minha irmã acima de tudo.Aos meus sobrinhos, Marcella e Fernando De Francesco Saavedra, e João Carlos.Aos meus queridos Tios, Vicente e Neide Siciliano, por atuarem como educadores e exemplo de como viver em família. Além de Tios, são pais, pelo amparo em todos os momentos de minha vida. E pela certeza que a realização deste trabalho representa/ou um momento de satisfação em suas vidas. AGRADECIMENTOSAo meu pai, Feliciano Alberto Nicodemo Saavedra, pelo exemplo de homem, pai e profissional. Sempre ao meu lado incentivando. A minha SUPER mãe, Lucia Helena de Siqueira Ferreira Anzaloni Saavedra, por todo esforço, dedicação e amor. Sempre preocupada com nosso bem-estar, abdicando de muitos valores para permitir a minha caminhada nesta grande conquista. São as pessoas mais importantes em minha vida. À Profa. Maria da Graça Naclério-Homem pelo seu exemplo de profissional, dedicação à pesquisa e ao ensino, pelas oportunidades e pelo incansável incentivo e apoio dispensados no decorrer do curso. A cada puxão de orelha, os quais sempre entendi serem de uma mãe para um filho, sempre demonstrando preocupação. Aos meus irmãosÀ amiga e Profa. Dra. Cristina Zindel Deboni pelo convívio, amizade, conhecimentos transmitidos e pelo exemplo de pesquisadora em quem pretendo me espelhar daqui para frente.Aos meus grandes amigos e tutores Prof. Dr. Rubens Camino Junior e Ricardo Pimenta D'Avila a quem devo muito de toda essa conquista. Pelas oportunidades, disponibilidade em sempre me ajudar e como exemplo de irmãos mais velhos. Tenho grande orgulho de tê-los como amigos.Aos amigos e "pais odontológicos" Prof. Dr. Luis Ronaldo Picosse e Profa. Dra. Laura Pagliuso Paleckis, pela confiança, ensinamentos, amizade, conhecimentos transmitidos, pelo exemplo de pesquisadores em quem pretendo me espelhar, a quem devo muito de toda essa conquista, pelas oportunidades, disponibilidade em sempre me ajudar e como exemplos de pessoas. Tenho grande orgulho em saber que posso tê-los como m...

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Preliminary investigation of the biomechanics of internal fixation of sagittal split osteotomies with miniplates using a newly designed in vitro testing model

Cited by 63 publications

References 31 publications

A comparison of fixation methods using three-dimensional finite element analysis following anterior segmental osteotomy

A comparison of fixation methods using three-dimensional finite element analysis following anterior segmental osteotomy

Assessment of rigidity and strength of selected osteosyntheses after bilateral sagittal split osteotomy

Estudo biomecânico comparativo de sistemas de fixação de 2,0-mm locking e convencionais em fraturas de ângulo em mandíbulas de cordeiro sob esforços em três eixos no espaço

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