Two-year follow-up of distraction osteogenesis: Its effect on mandibular ramus height in hemifacial microsomia

2000 ◽  
Vol 117 (2) ◽  
pp. 130-139 ◽  
Author(s):  
Iris Malagoni Marquez ◽  
Leward C. Fish ◽  
John Paul Stella
2017 ◽  
Vol 54 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Naohiro Suzuki ◽  
Akihiro Miyazaki ◽  
Tomohiro Igarashi ◽  
Hironari Dehari ◽  
Jun-Ichi Kobayashi ◽  
...  

Objective To clarify the relationship between mandibular ramus height and function of masticatory muscles in patients with hemifacial microsomia. Design Retrospective study of imaging and physiological data. Setting Images and physiological data were obtained from the records of Sapporo Medical University Hospital. Patients A total of 29 patients with hemifacial microsomia who showed Pruzansky grades I, II deformity. Main Outcome Measures Mandibular ramus height and masticatory muscle volume were evaluated with multi-detector row computed tomography. The electromyographic value was measured by the K7 Evaluation System. The hemifacial microsomia patients were classified into three groups based on the mandibular ramus height ratio of the affected and unaffected sides: group 0, > 1.00; group 1, 1.00 to 0.85; group 2, < 0.85. The Tukey-Kramer method and Games-Howell method were used to determine correlations between parameters. Results Decreased mandibular ramus height was significantly correlated with both reduced electromyographic values of the masseter muscle (P < .05) and the amount of mandibular lateral deviation at the time of maximum opening (P < .05) on the affected side. These differences were prominent in unilateral hemifacial microsomia patients classified as group 2. Conclusions Decreased mandibular ramus height may cause dysfunction of the masseter muscles but not the temporal muscle on the affected side in patients with hemifacial microsomia.


2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Piero Cascone ◽  
Valentino Vellone ◽  
Valerio Ramieri ◽  
Emanuela Basile ◽  
Achille Tarsitano ◽  
...  

Background. HFM patients’ reconstruction has always been a challenge for maxillofacial surgeons, and numerous reconstructive techniques have been described. Surgical treatment depends on the patient’s age and contemplates Temporomandibular Joint (TMJ) reconstruction in conjunction with orthognathic surgery, usually necessary following completion of growth to maximize the functional and esthetic results. Distraction osteogenesis had gained popularity as valid alternative in growing patients, but the two primary methods to reconstruct the TMJs involve the use of autogenous, using free or microvascular bone grafts, or alloplastic graft, but there is no widely accepted method. Methods. The increasing use of temporomandibular prosthesis for temporomandibular problems has led us to use them even in HFM. A case of female nongrowing patients with HFM type IIb treated with temporomandibular prosthesis in an all-in-one protocol is presented. Results. Incisal opening, measured with BioPAK system (Bioresearch Inc., Milwaukee, USA), was 21.4 mm in the presurgical period and 32.2 mm after all-in-one procedure, for an increase of 50.5%. Excursive movement to the right side was 2.2 mm in the presurgical period and was 1.5 mm after surgery, for a decrease of 31.8%. Left excursion movement changed from 5 mm to 6.1 mm, for an increase of 22.0%. Conclusions. The TMJ Concepts patient-fitted TJP in conjunction with orthognathic surgery for TMJ and jaw reconstruction is a valid option for patients with HFM.


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