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Effect of splinting mini-implants on marginal bone loss: a biomechanical model and clinical randomized study with mandibular overdentures.

Identifieur interne : 003355 ( Ncbi/Merge ); précédent : 003354; suivant : 003356

Effect of splinting mini-implants on marginal bone loss: a biomechanical model and clinical randomized study with mandibular overdentures.

Auteurs : Jorge Jofre [Chili] ; Patricio Cendoya ; Paola Munoz

Source :

RBID : pubmed:21197490

Descripteurs français

English descriptors

Abstract

This aim of this study was to evaluate the effect of splinting mini-implants on marginal bone loss when used to retain mandibular overdentures.

PubMed: 21197490

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pubmed:21197490

Le document en format XML

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<term>Alveolar Bone Loss (prevention & control)</term>
<term>Biomechanical Phenomena</term>
<term>Dental Implantation, Endosseous (instrumentation)</term>
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<term>Dental Prosthesis, Implant-Supported (adverse effects)</term>
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<term>Denture, Overlay</term>
<term>Female</term>
<term>Finite Element Analysis</term>
<term>Humans</term>
<term>Jaw, Edentulous (pathology)</term>
<term>Jaw, Edentulous (rehabilitation)</term>
<term>Longitudinal Studies</term>
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<term>Mandible (pathology)</term>
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<term>Models, Theoretical</term>
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<term>Adulte d'âge moyen</term>
<term>Analyse des éléments finis</term>
<term>Analyse du stress dentaire</term>
<term>Attelles</term>
<term>Conception de prothèse dentaire</term>
<term>Femelle</term>
<term>Humains</term>
<term>Implants dentaires (effets indésirables)</term>
<term>Mandibule ()</term>
<term>Mandibule (anatomopathologie)</term>
<term>Modèles théoriques</term>
<term>Mâchoire édentée (anatomopathologie)</term>
<term>Mâchoire édentée (rééducation et réadaptation)</term>
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<term>Overdenture</term>
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<term>Procédures de chirurgie préprothétique en odontologie ()</term>
<term>Procédures de chirurgie préprothétique en odontologie (instrumentation)</term>
<term>Prothèse dentaire implanto-portée (effets indésirables)</term>
<term>Résorption alvéolaire ()</term>
<term>Résorption alvéolaire (anatomopathologie)</term>
<term>Résorption alvéolaire (étiologie)</term>
<term>Résultat thérapeutique</term>
<term>Rétention d'appareil de prothèse dentaire (instrumentation)</term>
<term>Sujet âgé</term>
<term>Sujet âgé de 80 ans ou plus</term>
<term>Études longitudinales</term>
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<term>Alveolar Bone Loss</term>
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<term>Mandible</term>
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<term>Pose d'implant dentaire endo-osseux</term>
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<term>Aged</term>
<term>Aged, 80 and over</term>
<term>Biomechanical Phenomena</term>
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<term>Female</term>
<term>Finite Element Analysis</term>
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<term>Longitudinal Studies</term>
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<term>Treatment Outcome</term>
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<term>Adulte d'âge moyen</term>
<term>Analyse des éléments finis</term>
<term>Analyse du stress dentaire</term>
<term>Attelles</term>
<term>Conception de prothèse dentaire</term>
<term>Femelle</term>
<term>Humains</term>
<term>Mandibule</term>
<term>Modèles théoriques</term>
<term>Mâle</term>
<term>Overdenture</term>
<term>Phénomènes biomécaniques</term>
<term>Pose d'implant dentaire endo-osseux</term>
<term>Procédures de chirurgie préprothétique en odontologie</term>
<term>Résorption alvéolaire</term>
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<front>
<div type="abstract" xml:lang="en">This aim of this study was to evaluate the effect of splinting mini-implants on marginal bone loss when used to retain mandibular overdentures.</div>
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<AbstractText Label="PURPOSE" NlmCategory="OBJECTIVE">This aim of this study was to evaluate the effect of splinting mini-implants on marginal bone loss when used to retain mandibular overdentures.</AbstractText>
<AbstractText Label="MATERIALS AND METHODS" NlmCategory="METHODS">With mathematical models, a finite element analysis was performed to compare the bone stress distribution around two mini-implants, either splinted with a bar superstructure or not splinted. In the clinical portion of this study, 90 mini-implants were placed in the anterior mandibles of 45 completely edentulous patients selected from a public health center. Patients were randomly allocated into two groups. Group-ball (22 patients, n = 44) received two single ball-type mini-implants, and group-bar (23 patients, n = 46) received two mini-implants splinted with a prefabricated bar. All implants were placed using a flapless technique and loaded immediately. Marginal bone loss was assessed through standardized retroalveolar radiographs of each mini-implant and compared 5, 10, 15, and 24 months after implant placement.</AbstractText>
<AbstractText Label="RESULTS" NlmCategory="RESULTS">The finite element analysis showed the highest minimum principal stress (-118 MPa) in bone surrounding the unsplinted mini-implant, while around the splinted implants the principal stresses were -56.8 MPa. After 2 years of follow-up in the clinical study, group-ball showed a trend toward greater marginal bone loss than group-bar (1.43 ± 1.26 mm and 0.92 ± 0.75 mm, respectively). Group-ball showed a significantly higher prevalence of vertical bone loss than group-bar (chi-square test, two-tailed).</AbstractText>
<AbstractText Label="CONCLUSION" NlmCategory="CONCLUSIONS">Splinted mini-implants with a rigid superstructure decrease the bone stress level in comparison with single mini-implants. The effects of bone stress magnitude may explain the clinical outcome, in which splinted mini-implants supporting a mandibular overdenture showed less marginal bone loss compared with nonsplinted mini-implants. Vertical bone resorption morphology was significantly more prevalent in the latter group.</AbstractText>
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