Purpose:The aim of this study was to determine the effect of solid (one-piece) and two-piece abutments on the stress profile of narrow implants with marginal bone loss. Materials and Methods: Solid and two-piece abutments were connected to a conical internal octagon-connection implant (3.3 mm in diameter, 10 mm in length) and restored with a single crown. Three-dimensional finite element analysis was used to simulate the stress distribution in implant models with different levels of marginal bone resorption (0, 1, 2, and 3 mm). The effect of the design variables under increased bone resorption scenarios, including abutment screw length and diameter, were assessed. Static loading was applied to determine the mechanical response of the implant and cortical and trabecular bone. Results: Marginal bone resorption levels dominated the mechanical response under static loading conditions. A marginal bone loss of 3 mm significantly increased stress values in the implant vicinity and abutment screw. Both abutment designs displayed similar stress distribution in the surrounding bone, but lower stress values were observed in the implant body with two-piece abutments. The abutment screw length was more effective in the resultant stress, as the longer screws reduced the stress in the implants. Conclusion: Marginal bone resorption magnitude is the crucial parameter in biomechanics to determine the mechanical behavior. As bone loss increases, resultant stress around implants under mastication forces may lead to implant failure, regardless of abutment type.
Aim: Distraction osteogenesis (DO) is an alternative to orthognathic surgery that appears to have some advantages for advancement in the maxilla and mandible, but relatively high complication rates have been reported in the maxillofacial region. Methodology: A 22-year-old female with the chief complaint of maxillary hypoplasia was referred to our clinic. A two-stage procedure combining maxillary advancement by distraction technique with mandibular setback surgery was performed to correct jaw deformity. At the sixth day of the distraction breakage of the device occurred. The distractors were removed and the patient was treated using conventional osteotomy techniques to achieve good occlusion and improve the facial profile Results: Besides there are a number of studies about complications of DO, breakage of distractor has been really rare reported. In our case this unexpected and a very rarely reported complication occurred.
Conclusions:The purpose of the present case report is to present an undesirable and very rare complication associated with the maxillary distraction device and an alternative treatment method for managing this undesirable failure.
method for treating mandibular prognathism, distraction osteogenesis (DO) of the maxillary complex is an alternative approach.
Methodology: The clinical and radiological examinations of a 29-year-old male revealed maxillary retrognathism and mandibular prognathism without a vertical abnormality. The patient was treated with maxillary advancement by DO and mandibular setback surgery. Results: Long-term functional muscle exercises were scheduled. No relapse has occurred.
Conclusions: We believe that the patient’s cooperation and commitment to the functional exercise program played the most important role in the long-term success.
How to cite this article: Apaydın A, Yenigün S, Can T. Distraction Osteogenesis: Treatment of a Case with Maxillary Hypoplasia and Mandibular Prognatism. Int Dent Res 2011;3:92-94.
Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.
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