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PubMed · 14507149

Orthognathic surgery and implants.

Abstract

The resorptive pattern of the maxilla and mandible after the dentition has been lost often leads to a discrepancy between the jaws such that a significant Class III malocclusion occurs. This discrepancy between the jaws leads to problems with both fixed and removable prosthetic reconstruction of the jaws with teeth. The jaws are often resorbed to the point where the muscle attachments become dislodging forces for conventional dentures and also to the point where adequate implants cannot be placed. Various procedures have been developed to augment the alveolar ridges to allow for adequate reconstruction of the dentition. Orthognathic surgical procedures have been developed to reposition the jaws and have been traditionally used in the dentate patient to correct a skeletal malocclusion. These procedures are usually carried out with orthodontic control of the dentition to produce the best results. These same procedures can be used on the edentulous patient to correct the discrepancies between the jaws in order to reconstruct the dentition with implants. Bone grafting procedures are often required for these procedures so that the alveolus can be augmented at the same time and allow for dental implants to be placed at a later date.

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BibTeXRIS

Robert H B Jones. 2002. Orthognathic surgery and implants.. https://pubmed.ncbi.nlm.nih.gov/14507149/

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Bone formation after sinus augmentation with engineered bone.

OBJECTIVES: The aim of the following investigation was to quantify the resorption rate of tissue-engineered bone grafts in the maxillary sinus using volume measurements. MATERIAL AND METHODS: Sinus floor augmentation using autologous bone grafts from the iliac crest (n=17, group 1) was compared with commercially produced transplants of human cells seeded on polyglycolid-polylactid (PLGA) scaffolds (Oral Bone) (n=14, group 2). RESULTS: The total resorption rate for autologous transplants 3 months post operation was 29%, while the tissue-engineered bone showed a resorption rate of 90%. The autologous bone had a bone density of up to 266-551 Hounsfield units (HU), while sufficient mineralization of tissue-engineered bone was found in only one case (152 HU). CONCLUSION: In this clinical study, the use of autologous cancellous bone grafts in sinus augmentation was more reliable than scaffolds containing cultured osteoblasts. Further tissue-engineered bone transplants should be examined to draw general conclusions about the use of tissue-engineered grafts compared with autologous bone grafts for maxillary sinus augmentation.

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