Article

Endosseous cylinder implants in severely atrophic mandibles.

Department of Oral and Maxillofacial Surgery, Baylor College of Dentistry, Dallas 75246.
The International journal of oral & maxillofacial implants (impact factor: 1.78). 02/1991; 6(3):264-9. pp.264-9
Source: PubMed

ABSTRACT A retrospective study was completed to assess the success rate of endosseous cylinder implants placed in mandibles that were 10 mm or less in maximum anterior height as measured from lateral cephalometric radiographs. Only implants that were located anteriorly between the mental foramina and loaded prosthetically for a minimum of 1 year were studied. Twenty-eight patients with a total of 130 Nobelpharma implants (forty-six 7 mm and eighty-four 10 mm) were included. The fixtures were evaluated following standard clinical criteria for success established for implants of this type. A total of 8 (two 7 mm and six 10 mm) of 130 implants failed, yielding an overall success rate of 94%. Major complications encountered included a complete mandibular fracture, a partial mandibular fracture, and a temporary bilateral mental nerve hypoesthesia.

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    Article: Implants in the severely resorbed mandibles: whether or not to augment? What is the clinician's preference?
    Frits B T Perdijk, Gert J Meijer, Ewald M Bronkhorst, Ron Koole
    [show abstract] [hide abstract]
    ABSTRACT: The aim of this study is to inventory in the Netherlands which therapy is the clinician's first choice when restoring the edentulous mandible. A questionnaire was sent to all Dutch Oral and Maxillofacial surgeons. As part of this, the surgeons were invited to treat five virtual edentulous patients, differing only in mandibular residual height. In cases of a sufficient residual height of 15 mm, all surgeons were in favour to insert solely two implants to anchor an overdenture. In case of a residual height of 12 mm, 10% of the surgeons choose for an augmentation procedure. If a patient was presented with a mandibular height of 10 mm, already 40% of the OMF surgeons executed an augmentation procedure. Most (80%) surgeons prefer the (anterior) iliac crest as donor site. The choice of 'whether or not to augment' was not influenced by the surgeon's age; however, the hospital, where he was trained, did. Surgeons trained in Groningen were more in favour of installing short implants in mandibles with reduced vertical height. As the option overdenture supported on two interforaminal implants is reimbursed by the Dutch health assurance, this treatment modality is very popular in the Netherlands. From a point of costs and to minimize bypass comorbidity, surgeons should be more reluctant in executing augmentation procedures to restore the resorbed edentulous mandible as it is dated in literature that also in mandibles with a residual height of 10 mm or less, solely placing implants, thus without an augmentation procedure in advance, is a reliable treatment option.
    Oral and Maxillofacial Surgery 08/2011; 15(4):225-31.
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Keywords

anteriorly
 
complete mandibular fracture
 
fixtures
 
lateral cephalometric radiographs
 
maximum anterior height
 
mental foramina
 
partial mandibular fracture
 
patients
 
retrospective study
 
standard clinical criteria
 
success rate
 
temporary bilateral mental nerve hypoesthesia