Osseointegration under Immediate Loading: Biomechanical Stress–Strain and Bone Formation–Resorption

Kawahara, Hiroyuki; Kawahara, Dai; Hayakawa, Masahide; Tamai, Yoshihisa; Kuremoto, Tokio; Matsuda, Seiji

doi:10.1097/01.id.0000034394.75768.e3

Cited by 59 publications

(35 citation statements)

References 8 publications

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“…Several parameters have been used in past experimental and clinical studies to represent implant primary stability in experimental or clinical studies. These parameters include insertion torque [20], removal torque [21], cutting torque [22], pull-out force [21], Periotest data [21, 23], and implant stability quotient (ISQ), as derived from resonance frequency analysis [24, 25]; however, it would appear that most of these parameters are either too low in sensitivity or that the correlation between these parameters is somewhat questionable [22, 26]. Under such circumstances, finite element analysis (FEA) is an efficient technique for the evaluation of micromotion [27–29].…”

Section: Introductionmentioning

confidence: 99%

Influence of Thread Pitch, Helix Angle, and Compactness on Micromotion of Immediately Loaded Implants in Three Types of Bone Quality: A Three-Dimensional Finite Element Analysis

Packham

Xiong

Tan

et al. 2014

BioMed Research International

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This study investigated the influence of thread pitch, helix angle, and compactness on micromotion in immediately loaded implants in bone of varying density (D2, D3, and D4). Five models of the three-dimensional finite element (0.8 mm pitch, 1.6 mm pitch, 2.4 mm pitch, double-threaded, and triple-threaded implants) in three types of bone were created using Pro/E, Hypermesh, and ABAQUS software. The study had three groups: Group 1, different pitches (Pitch Group); Group 2, same compactness but different helix angles (Angle Group); and Group 3, same helix angle but different compactness (Compact Group). Implant micromotion was assessed as the comprehensive relative displacement. We found that vertical relative displacement was affected by thread pitch, helix angle, and compactness. Under vertical loading, displacement was positively correlated with thread pitch and helix angle but negatively with compactness. Under horizontal loading in D2, the influence of pitch, helix angle, and compactness on implant stability was limited; however, in D3 and D4, the influence of pitch, helix angle, and compactness on implant stability is increased. The additional evidence was provided that trabecular bone density has less effect on implant micromotion than cortical bone thickness. Bone type amplifies the influence of thread pattern on displacement.

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Section: Introductionmentioning

confidence: 99%

Influence of Thread Pitch, Helix Angle, and Compactness on Micromotion of Immediately Loaded Implants in Three Types of Bone Quality: A Three-Dimensional Finite Element Analysis

Packham

Xiong

Tan

et al. 2014

BioMed Research International

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“…With respect to histological bone implant contacts, no significant difference between immediately loaded implants and those of delayed loaded or those of unloaded was observed. It was postulated that mechanical stimulation quite possibly enhanced bone formation (Romanos et al, 2002(Romanos et al, , 2003 Kawahara et al studied the effect of immediate loading at the implant interface in dogs and concluded that micromotion of less than 30μm did not impede bone ingrowth (Kawahara et al, 2003). For an immediate loading model with varying degrees of implant displacement, micromotion had a positive effect on bone formation around a roughened implant surface and a negative effect on a turned implant surface (Vandamme et al, 2007).…”

Section: Immediate and Early Loadingmentioning

confidence: 99%

Changes in Bone Metabolisim Around Osseointegrated Implants Under Loading

Koyama¹,

Sasaki²,

Yokoyama³

et al. 2011

Implant Dentistry - The Most Promising Discipline of Dentistry

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“…Varios estudios se han focalizado en la disminución del período de espera establecido por Brånemark en implantes unitarios en zonas estéticas maxilares, temporizándolos inmediatamente, obteniendo tasas de sobrevida implantarias y protésicas sobre el 90% (5,6,7) . El resultado teórico de una temporización o estética inmediata radica en la minimización de los micro movimientos intra óseos, logrados al obtener valores de torque de inserción superior a 35 NTw (8)(9)(10)(11) , gracias a los mejoramientos en el diseño macro y microscópico de los actuales implantes que se encuentran en el mercado, y a la protección de la estructura protésica temporal de una carga oclusal directa, debido a la presencia de piezas dentarias vecinas al espacio desdentado a implantar.Clínicamente la opción de temporizar una pieza inmediatamente es un tratamiento de elección en la actualidad, ya que facilita la estética, mejora las condiciones sicológicas de espera del paciente a su restauración definitiva y facilita el proceso de oseointegración, aumentando el contacto del hueso circundate con el implante (12,13,14) . …”

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Temporización inmediata de implantes unitarios en la maxila posterior

Leighton

Carvajal

Wolnitzky³

et al. 2011

Rev. Clin. Periodoncia Implantol. Rehabil. Oral

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RESUMENPropósito: El presente artículo es un estudio prospectivo de las tasas de éxito implantaria y de las complicaciones mecánicas y biológicas en el tratamiento rehabilitador implanto-asistido del sector posterior de la maxila, mediante provisionalización inmediata. Material y Método: El estudio clínico observó a 21 sujetos desdentados parciales unitarios del sector posterior maxilar, con reborde cicatrizado y antagonista dentario natural, por un período de 6 meses, en los que se insertaron implantes cónicos roscados de conexión interna, con tratamiento de superficie, temporizados inmediatamente después de insertados en el hueso maxilar, mediante la confección de una corona de resina acrílica sobre un pilar temporal de titanio atornillada directa al implante, dejados sin contactos dentarios durante la máxima intercuspidación (MIC) y movimientos excéntricos mandibulares. Todas las restauraciones fueron observadas durante un período de 6 meses, evaluando tasa de éxito implantario, complicaciones biológicas y mecánicas. Resultados: Se insertaron 25 implantes en 21 pacientes, obteniéndose un valor promedio de inserción de torque quirúrgico de 45.6 Nt. Durante el período de observación clínico se presentó un 100% de éxito de sobrevida implantario, no se detectaron complicaciones biológicas, pero sí se presentaron complicaciones mecánicas por fractura de una cúspide vestibular de una restauración provisional acrílica y dos aflojamientos de tornillos. Conclusiones: La temporización unitaria mediante provisorio atornillado es un protocolo predecible y confiable que permite el proceso de oseointegración y la coexistencia en salud de tejido periimplantario y su sistema protésico. ABSTRACTPurpose: This article is a prospective study of implant success rates and of mechanical and biological complications in the assisted-implant rehabilitation treatment of the posterior maxilla by immediate temporization. Material and Methods: The clinical study observed 21 partially edentulous subjects with lip scar and antagonistic natural teeth in the posterior maxilla for a period of 6 months in which conical threaded internal implant connections were inserted with a surface treatment and timed immediately after being inserted into the jawbone by producing an acrylic resin crown on a temporary titanium abutment screwed directly into the implant and left without tooth contacts during the Maximal Intercuspal (MIC) and mandibular eccentric movements. All restorations were observed over a period of 6 months evaluating implant success rate and biological and mechanical complications. Results: 25 implants were inserted into 21 patients yielding an average surgical insertion torque of 45.6 Nt. During the clinical observation there was 100% success of implant survival. No biological complications were detected, but there were mechanical complications -a buccal cusp fracture of an acrylic provisional restoration and two screws loosening. Conclusions: The unit temporization by temporary screwing is a predictable and reliable protocol that allo...

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Osseointegration under Immediate Loading: Biomechanical Stress–Strain and Bone Formation–Resorption

Cited by 59 publications

References 8 publications

Influence of Thread Pitch, Helix Angle, and Compactness on Micromotion of Immediately Loaded Implants in Three Types of Bone Quality: A Three-Dimensional Finite Element Analysis

Influence of Thread Pitch, Helix Angle, and Compactness on Micromotion of Immediately Loaded Implants in Three Types of Bone Quality: A Three-Dimensional Finite Element Analysis

Changes in Bone Metabolisim Around Osseointegrated Implants Under Loading

Temporización inmediata de implantes unitarios en la maxila posterior

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