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At least 163 records · Page 9Linked to original sources
PubMed2002

Human masticatory muscle volume and zygomatico-mandibular form in adults with mandibular prognathism.

Although several investigators have reported associations between masticatory muscles and skeletal craniofacial form, there is no agreement on the association. We tested the hypothesis that masticatory muscle volume correlates with the size and form of the adjacent local skeletal sites. For this purpose, we investigated the morphological association of the cross-sectional area and volume of temporal and masseter muscles with zygomatico-mandibular skeletal structures using computerized tomography (CT) in 25 male adults with mandibular prognathism. Muscle variables significantly correlated with widths of the bizygomatic arch and temporal fossa but not with the cranium width. Masseter volume significantly correlated with cross-sectional areas of the zygomatic arch and mandibular ramus. Masseter orientation was almost perpendicular to the zygomatic arch and mandibular antegonial region. The zygomatic arch angle significantly correlated with the antegonial angle. The results of the study suggest that the masticatory muscles exert influence on the adjacent local skeletal sites.

Adolescent↗
PubMed2005

Genome-wide linkage analysis of mandibular prognathism in Korean and Japanese patients.

The existence of familial aggregation of mandibular prognathism (MP) suggests that genetic components play an important role in its etiology. In this study, a genome-wide linkage analysis to identify loci susceptible to MP was conducted with 90 affected sibling-pairs in 42 families, comprised of 40 Korean sibling-pairs and 50 Japanese sibling-pairs. Two non-parametric linkage analyses, GENEHUNTER-PLUS and SIBPAL, were applied and detected nominal statistical significance of linkage to MP at chromosomes 1p36, 6q25, and 19p13.2. The best evidence of linkage was detected near D1S234 (maximum Z(lr) = 2.51, P = 0.0012). In addition, evidence of linkage was observed near D6S305 (maximum Z(lr) = 2.23, P = 0.025) and D19S884 (maximum Z(lr) = 1.93, P = 0.0089). Identification of the susceptible genes in the linkage regions will pave the way for insights into the molecular pathways that cause MP, especially overgrowth of the mandible, and may lead to the development of novel therapeutic tools.

Adolescent↗
PubMed2006

Sequence of treatment in mandibular prognathism patients.

Intraoral vertical ramus osteotomy (IVRO) and advancement genioplasty are effective and predictable methods of treating selective individuals with mandibular prognathism. The sequence of performing these procedures does have a clinical effect, but this is not found in the literature. The purpose of this article is to introduce the clinical implication of the sequence of procedures and to recommend the preferred sequence based on experience. A retrospective study was conducted on 75 patients treated by IVRO with or without genioplasty. In 31 patients, IVRO was performed without genioplasty; only one patient suffered from transient hypoesthesia. When IVRO was performed before genioplasty (sequence I) in 20 patients, nine suffered from mental nerve hypoesthesia. However, when IVRO was performed after genioplasty (sequence II) in 24 patients, permanent mental nerve anesthesia occurred in five patients and mental nerve hypoesthesia in 15 patients. Based on these results, it is recommended that IVRO be performed before genioplasty.

Chi-Square Distribution↗
PubMed2006

Multidisciplinary treatment of mandibular prognathism with multiple congenitally missing teeth.

Surgical orthodontic treatment and dental implant therapy were performed on a man (aged 18 years 8 months) with mandibular prognathism and seven congenitally missing teeth: upper canines, first and second premolars and lower right second premolar. After 17 months of preoperative orthodontic treatment at age 20 years 1 month, sagittal split ramus osteotomy was performed using the remaining upper deciduous teeth as an anchor for intermaxillary fixation. In postoperative orthodontic treatment, the remaining deciduous teeth were extracted, and fixture installation was performed. The entire therapy required 4 years to complete (age 22 years 8 months). After completion of orthodontic treatment, superstructures were put in place. This patient had many dental problems, so multidisciplinary care was performed in conjunction with other departments to improve oral function and facial esthetics.

Adolescent↗
PubMed1987

Geographical distribution, preoperative orthodontics, and morbidity of Norwegian patients surgically treated for mandibular prognathism.

The geographical distribution of 1169 Norwegian patients operated on for mandibular prognathism during the years 1975-1984 showed an accumulation of cases in the western and northern parts of the country. This skew distribution was probably due to genetic factors. No association was found between the number of operated patients and the number of orthodontists or oral and maxillofacial surgeons in the different counties. Most of the patients (69%) had less than 2 years and 10% had more than 4 years of preoperative orthodontic treatment. The use of presurgical orthodontics seemed to increase during the observation period, and the mean treatment time was shorter in the last half of the decade. The morbidity, defined as the duration of the hospital stay and the intermaxillary fixation period, was on an average 56 days, mostly dependent on the surgical unit.

Adult↗
PubMed1979

Surgical correction of mandibular prognathism by the oblique sliding osteotomy. A clinical and radiological follow-up study of 112 consecutive cases.

The oblique sliding osteotomy has been used for surgical correction of mandibular prognathism, sometimes in combination with open bite, in 112 patients treated from 1969 to 1978. The method has proved to be connected with few surgical complications and minimal relapse tendency. No correlation was found between the degree of posterior positioning or closure of open bite at the operation and relapse tendency. Consequently no limitations in the field of application concerning the degree of mandibular protrusion or open bite have been found in this study.

Adolescent↗
PubMed1999

[The temporomandibular joints before and after the surgical treatment of patients with maxillary micro- or retrognathism and mandibular macro- or prognathism].

The temporomandibular joint has been examined in patients with combined deformations of the jaws (upper micro- or retrognathia and lower macro- or prognathism) before and after surgical treatment of the maxilla and mandible. Analysis of changes in the temporomandibular joint at all stages of medical rehabilitation showed that structural changes develop only in 8% patients only after planar osteotomy of the mandible through external or oral approach.

Adolescent↗
PubMed1976

Treatment of mandibular prognathism in an acromegalic patient.

A 41-year-old man with acromegaly underwent cryosurgery for a pituitary adenoma. Although soft tissue regression is possible after pituitary ablation, bony changes are permanent. Thus, bilateral vertical osteotomies and bilateral coronoidotomies were performed for correction of the mandibular prognathism. The postoperative occlusion and facial profile were very acceptable. Unfortunately, the patient died of a myocardial infarction eight days postoperatively.

Acromegaly↗
PubMed1976

[Problems of the treatment of prognathism by sagittal splitting of the ascending mandibular branch].

The author reports 20 years of experience at the Zurich clinic with the treatment of mandibular prognathism by sagittal cutting of the ascending mandibular rami. The original method of Obwegeser and its modifications (1955, 1957) are discussed. After mentioning the indications, the technique of surgery is described, such as it is practised today at the clinic of maxillofacial surgery in Zurich. The classical method applies to tooth bearing arches, while modifications are necessary in edentulous mandibles. Further on, modifications as mentioned in the literature, particularly applying to the soft tissue cuts, the bone cuts, the position of the buccal cut of the cortical bone, the direction of partition, the technique of partition and the fixation of the segments, finally the intermaxillary splinting and drainage are mentioned. It is explained, why in the Zurich clinic the technique of Obwegeser is still prevalently used. The most prominent modifications are the blunt partition of the ramus and the control of the position of the condyle under the radiographic viewer. The use of the modification in the cut of the buccal cortical bone after Dal Pont (1959) was abandoned again.

Female↗
PubMed2001

Mental retardation, obesity, mandibular prognathism with eye and skin anomalies (MOMES syndrome): a newly recognized autosomal recessive syndrome.

We report two daughters of a Thai family affected with mental retardation, delayed speech, obesity, craniofacial manifestations, and ocular anomalies. Craniofacial manifestations included macrocephaly, maxillary hypoplasia, mandibular prognathism, and crowding of teeth. Ocular anomalies consisted of blepharophimosis, blepharoptosis, decreased visual acuity, abducens palsy, hyperopic astigmatism, and accommodative esotropia. Chronic atopic dermatitis, lateral deviation of the great toes, and cone-shaped epiphyses of the toes were observed. The disorder is suggested to be autosomal recessive. The combination of findings found in our patients has not hitherto been described.

Abnormalities, Multiple↗
PubMed2001

[An analysis for causes of skeletal relapse after correction of mandibular prognathism by BSSRO].

OBJECTIVE: To investigate the factors responsible for the skeletal relapse after correction of mandibular prognathism by BSSRO. METHODS: The skeletal and dental changes before and after the surgery were analysed by cephalometrics, The factors that might be responsible for the skeletal relapse were evaluated using multiple linear and partial correlation analysis. RESULTS: The changes of NP-FH angle at follow up had a significant correlation with MP-FHT4-3 angle, the duration of presurgical orthodontics and the observation period after surgery(r = -0.568, -0.406, -0.400, P < 0.01-0.05). CONCLUSION: The skeletal relapse following BSSRO was limited. The stability was related to the period of presurgical orthodontics and the mandibular rotation after the surgery.

Female↗
PubMed1999

[Pre- and post surgical orthodontic treatment of mandibular prognathism].

OBJECTIVE: To analyze the patients we treated in clinic through combined orthodontic-orthognathic surgery, and get some guidance for the future clinical work. METHODS: All 40 skeletal Class III malocclusion patients we analyzed were from joint clinic of our hospital. They aged from 17 to 38. RESULTS: The duration for presurgical orthodontic treatment was 9 months on average (2-25 months), and for postsurgical orthodontic treatment about 7.6 months on average (2-15 months). The duration for whole active treatment was 16 months on average (4-41 months). The objectives of presurgical orthodontic are: Alignment of dental arches, decompensation of anterior and posterior teeth, leveling of arches, and coordination of the width of the upper and lower arches. After presurgical orthodontic treatment, most of the patients could be treated by one piece surgery, which could simplify the surgical procedure and reduce the relapse rate of surgery. During the surgery, we modified the intermaxilary fixation wires. We used rigid rectangular stainless steel wires with Edgewise appliances as the fixation wires instead of conventional canine and molar bands with multiloop wires. The aims of the postsurgical orthodontic treatment are: closing residual spacing, extrusion of posterior teeth for correction of local openbite in premolars region, paralleling of the teeth, and adjustment of occlusion. CONCLUSION: Pre- and post-ssurgical orthodontic treatment is essential to the surgical treatment for mandibular prognathism.

Adolescent↗
PubMedDate not supplied

Post surgical modification of facial divergency in 40 patients with mandibular prognathism.

With a Le Fort type I and sagittal-bilateral surgery in a single time is usually impossible to solve problems of divergency and maxillary-mandibular prognathism in patients with tooth-skeletric III class. According to the Authors, in these patients, to plan an efficient surgical correction treatment, is suitable to analyse, before surgery, not only all data of maxillary-mandibular protrusion but also those of facial divergency.

Adolescent↗
PubMed1975

[Planning the surgical treatment of mandibular prognathism].

The method for calculating a required displacement of the mandible posteriorly in surgical treatment of prognathism by the technic of oblique osteotomy of the mandibular branches is suggested. The described technic was successfully employed by the author in 56 patients. The technic concerned would reduce the time of a surgical procedure (up to 50-60 min). The main advantage of the technic is that it completely excluded errors in calculating the displacement of the mandible posteriorly.

Humans↗
PubMed2005

Nonsurgical and nonextraction treatment of a skeletal class III adult patient with severe prognathic mandible.

AIM: A patient with a skeletal Class III malocclusion, prognathic mandible, anterior open bite, large tongue, and temporomandibular disorders is presented. Treatment objectives included establishing a stable occlusion with normal respiration, eliminating temporomandibular disorder symptoms, and improving facial esthetics through nonextraction and nonsurgical treatment by creating a favorable perioral environment, restoring the harmony to the tongue and perioral environment, improving masticatory muscle function, and creating adequate tongue space for establishment of normal respiration. SUBJECT AND METHODS: The patient was a Japanese adult male, who had previously been advised to have orthognathic surgery, with tongue-size reduction. An expansion plate was used to expand the maxillary dentoalveolar arch. Distalization of the mandibular arch was achieved by reduced excessive posterior vertical dimension, through uprighting and intruding the mandibular posterior teeth and rotating the mandible slightly counter-clockwise. The height of the maxillary alveolar process and the vertical height of symphysis were increased slightly. The functional occlusal plane was reconstructed by uprighting and intruding the posterior teeth with a full-bracket appliance, combined with a maxillary expansion plate, with short Class III and vertical elastics in the anterior area. Myofunctional therapy involved sugarless chewing gum exercises. RESULTS: The excessive posterior vertical occlusal dimension was reduced slightly, creating a small clearance between the posterior maxilla and mandible. At the same time, the interferences in the posterior area were eliminated by the expansion of the maxillary dentoalveolar arch. As a result, the laterally displaced mandible moved to a more favorable jaw relationship, with distalization of the mandibular arch. The functional occlusal plane was reconstructed and an almost-normal overjet and overbite were created. Adequate tongue space for normal respiration was established during the early stage of treatment, by 7 months. A stable occlusion, with adequate posterior support and anterior guidance, was established and maintained at more than 4 years posttreatment.

Adolescent↗
PubMed1991

Tomographic assessment of alterations of the temporomandibular joint after surgical correction of mandibular prognathism.

The aims of this study were to identify absolute condylar displacements and temporal fossa changes and to assess alterations in the condyle-fossa relationships after bilateral vertical ramus osteotomy for correction of mandibular prognathism. Twenty-four patients had linear tomograms taken of their temporomandibular joints within 1 week preoperatively and 6 months postoperatively. To ensure identical orientation of the focusing plane, a custom-made headholder was constructed and the head of the patient was positioned on the x-ray table in a standardized way. All radiographs were traced, and superimposition was made on stable structures, such as the mastoid cells of the temporal bone, the auditory meatus, the zygomatic arch, and the anterior cranial base. The results of the study indicated that, 6 months postsurgery, the only statistically significant change existed in the posterior joint space, which showed an average increase of 0.7 mm (P = .003). All other variables showed that the condylar position within the joint tended to approach its preoperative value. Small resorptive alterations in the glenoid fossa were also noticed.

Adult↗