scholarly journals A New Orthodontic-Surgical Approach to Mandibular Retrognathia

2021 ◽  
Vol 8 (11) ◽  
pp. 180
Author(s):  
Francisco Vale ◽  
Joana Queiroga ◽  
Flávia Pereira ◽  
Madalena Ribeiro ◽  
Filipa Marques ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Orthognathic Surgery ◽  
Growth Disorders ◽  
Facial Skeleton ◽  
Mandibular Bone ◽  
Gonial Angle ◽  
Lower Canine ◽  
Bone Segment ◽  
Free Solder ◽  
Mandibular Retrognathia

(1) Background: Mandibular deficiency is one of the most common growth disorders of the facial skeleton. Recently, distraction osteogenesis has been suggested as the treatment of choice for overcoming the limitations of conventional orthognathic surgery; (2) Methods: A new custom-manufactured dental-anchored distractor was built and anchored in the first molar and lower canine. It consists of a stainless-steel disjunction screw, adapted and welded to the orthodontic bands through two 1.2 mm diameter connector bars with a universal silver-based and cadmium-free solder; (3) Results: The distractor described can be a useful tool to correct mandibular retrognathia and is better tolerated by patients, especially in severe cases; (4) Conclusions: The dental-anchored distractor increases the anterior mandibular bone segment without affecting the gonial angle or transverse angulation of the segments and avoids posterior mandibular rotation, overcoming the limitations of conventional surgical treatment.

scholarly journals Current Trends in Orthognathic Surgery in Poland—A Retrospective Analysis of 124 Cases

2021 ◽  
Vol 11 (14) ◽  
pp. 6439
Author(s):  
Ewa Zawiślak ◽  
Szymon Przywitowski ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Paweł Golusiński ◽  
...  
Keyword(s):  
Orthognathic Surgery ◽  
Corrective Osteotomy ◽  
University Hospital ◽  
Class Iii ◽  
Facial Skeleton ◽  
Skeletal Class ◽  
Skeletal Malocclusion ◽  
Current Trends ◽  
Maxillary Osteotomy ◽  
Skeletal Class Ii

The analysis aims at assessing the current trends in orthognathic surgery. The retrospective study covered a group of 124 patients with skeletal malocclusion treated by one team of maxillofacial surgeons at the University Hospital in Zielona Góra, Poland. Various variables were analysed, including demographic characteristics of the group, type of deformity, type of osteotomy used, order in which osteotomy was performed and duration of types of surgery. The mean age of the patients was 28 (ranging from 17 to 48, SD = 7). The group included a slightly bigger number of females (59.7%), with the dominant skeletal Class III (64.5%), and asymmetries were found in 21.8% of cases. Types of osteotomy performed during surgeries were divided as follows: LeFort I, segmental LeFort I, BSSO, BSSO with genioplasty, LeFort I with BSSO, LeFort I with BSSO and genioplasty, segmental LeFort I with BSSO, isolated genioplasty. Bimaxillary surgeries with and without genioplasty constituted the largest group of orthognathic surgeries (49.1%), and a slightly smaller percentage were one jaw surgeries (46.7%). A statistically significant correlation was found between the type of surgery and the skeletal class. In patients with skeletal Class III, bimaxillary surgeries were performed significantly more often than in patients with skeletal Class II (57.5% vs. 20.0%; p = 0.0002). The most common type of osteotomy in all surgeries was bilateral osteotomy of the mandible modo Obwegeser–Epker in combination with Le Fort I maxillary osteotomy (42.7%). The order of osteotomies in bimaxillary surgeries was mandible first in 61.3% of cases. The longest surgery was bimaxillary osteotomy with genioplasty (mean = 265 min), and the shortest surgery was isolated genioplasty (mean = 96 min). The results of the analysis show a significant differentiation between the needs of orthognathic surgery and the types of corrective osteotomy applied to the facial skeleton.

Orthognathic Surgery for Correction of Patients With Mandibular Excess: Don’t Forget to Assess the Gonial Angle

2013 ◽  
Vol 71 (6) ◽  
pp. 1063-1072 ◽  
Author(s):  
Marcello Guglielmi ◽  
Keith M. Schneider ◽  
Giorgio Iannetti ◽  
Changyoung Feng ◽  
Alan Y. Martinez
Keyword(s):  
Orthognathic Surgery ◽  
Gonial Angle

Post-traumatic TMJ internal derangement: impact on facial growth (findings in a pediatric age group)

2003 ◽  
Vol 27 (4) ◽  
pp. 297-303 ◽  
Author(s):  
Patrizia Defabianis
Keyword(s):  
Facial Asymmetry ◽  
Internal Derangement ◽  
Proper Function ◽  
Radiographic Examination ◽  
Facial Growth ◽  
Facial Skeleton ◽  
Pediatric Age Group ◽  
Mandibular Asymmetry ◽  
Temporal Bones ◽  
Mandibular Retrognathia

Many clinical studies have shown how jaw injuries sustained during impact trauma to the face or mandible are the single most important cause of TMJ subsequent internal derangement. Proper function of the masticatory system is certainly the most influential variable in the TMJ remodelling; once a TMJ is internally deranged, adaptative or degenerative osteocartilagineous processes take place in the mandible, temporal bones and muscles.To evaluate relationships between consequences of posttraumatic TMJ internal derangement and disturbed facial skeleton growth in children, 25 patients (16 boys, 9 girls), 14 year of age or younger, were selected out of a group of 74 and analysed. They all had been treated by physiotherapy and had undergone combined clinical and radiographic examination for five years. Symptoms included, either individually or in various combination, pain, mechanical TMJ dysfunction and facial skeletal abnormalities, such as mandibular retrognathia and lower facial asymmetry manifested by chin deviation from the midline. Seventeen patients were found to have at least one abnormal and internally deranged TMJ on imaging studies; in twelve of them a mandibular asymmetry with chin deviation from the midline to the smaller or more degenerated TMJ was evident. Of the eight retrognathic patients, five were found to have bilateral TMJ derangement. In three patients both TMJ(s) were normal with normal facial structure. These data suggest that TMJ derangement in children may potentially have an impact on facial growth and lead to the development of retrognathia, with or without asymmetry, in many cases.

GS0414 Initial Corrosion Behavior of Stainless Steel in the Molten Lead-free Solder

2016 ◽  
Vol 2016.22 (0) ◽  
pp. _GS0414-1_-_GS0414-2_
Author(s):  
Kenji MIKI ◽  
Akira YAMAUCHI ◽  
Masashi KUROSE ◽  
Makoto NANKO
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Lead Free ◽  
Lead Free Solder ◽  
Molten Lead ◽  
Free Solder

scholarly journals Orthognathic Surgery for Mandible

2021 ◽  
pp. 1477-1512
Author(s):  
Varghese Mani
Keyword(s):  
Temporal Bone ◽  
Blood Supply ◽  
Orthognathic Surgery ◽  
Facial Skeleton ◽  
Facial Bones ◽  
Alveolar Region ◽  
Functional Changes ◽  
Evolutionary Changes ◽  
Inferior Border ◽  
Mandibular Joints

AbstractMandible, a horseshoe shaped bone of the facial skeleton, is one of the sturdy bones in humans. Prominent chin is a unique feature of anatomically modern man in comparison with his anthropological ancestors. The simian shelf has reduced to two genial tubercles to which two muscles are attached. The neck of the condyle has narrowed and acts as a buffer to budge by fracture if there is a severe force on the prominent chin. These evolutionary changes facilitated increased space for the tongue as men started articulation. It articulates with the temporal bone by two inter-dependent Temporo-mandibular joints. Mandible is important in both function and aesthetics.Mandible can be cut into multiple pieces and re-arranged and fixed to achieve aesthetic and functional changes. Facial bones have a tremendous capacity to regenerate and heal provided proper blood supply is ensured to the cut segments. Ostoetomies of the mandible can be done on ramus, body, chin, dento-alveolar region, inferior border, etc. Most of these procedures are done intraorally. Technological advancements have aided orthognathic surgery at large. This chapter envisages to elaborate different techniques of osteotomy of mandible.

scholarly journals Correction of Mandibular Retrognathia and Laterognathia by Distraction Osteogenesis: Follow up of 5 cases

2009 ◽  
Vol 03 (04) ◽  
pp. 335-342 ◽  
Author(s):  
Dogan Dolanmaz ◽  
Ali Ihya Karaman ◽  
Hakan Gurcan Gurel ◽  
Abdullah Kalayci ◽  
Hasan Kucukkolbasi ◽  
...  
Keyword(s):  
Distraction Osteogenesis ◽  
Clinical Success ◽  
Term Treatment ◽  
Mandibular Distraction ◽  
Gonial Angle ◽  
Affected Side ◽  
Long Term Treatment ◽  
Mandibular Retrognathia ◽  
Ramus Height

ABSTRACTThis article evaluates the use of distraction osteogenesis in the treatment of mandibular retrognathia and laterognathia and the long term treatment results of the patients treated with this technique. The procedure was carried out in 5 subjects (3 males and 2 females, mean age 18.4 years) aged between 14 years and 27 years. In patients treated with bilateral mandibular distraction, it was observed that the ANB angle decreased by a mean of 5°, the mandibular corpus length increased by a mean of 14.5 mm and the overjet decreased by a mean of 12.2 mm after treatment. In patients treated with unilateral mandibular distraction, a mean of 3.5° reduction was achieved in ANB angle, the mandibular corpus length increased by a mean of 5.5 mm and a mean of 7 mm correction was achieved in relation to craniofacial midline with treatment. One of these patients showed an increase of 10 mm in ramus height on the affected side and a decrease of 5° in gonial angle whereas the other one showed an increase of 12.5° in gonial angle and an increase of 11 mm in ramus height on the affected side after treatment. The most significant long term relapse was observed in one of the patients treated with bilateral mandibular distraction. Long term relapse seen in the rest of the patients was within clinically acceptable limits. It can be concluded that distraction of the deformed mandible is a feasible and effective technique for treating mandibular retrognathia and laterognathia. However, it must be borne in mind that accurate placement of the distractors and determining the correct distraction vector are crucial factors that have an influence on long term clinical success. (Eur J Dent 2009;3:335-342)

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