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1.
Angle Orthod ; 90(6): 890, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33126258
2.
Sci Rep ; 10(1): 14454, 2020 09 02.
Artículo en Inglés | MEDLINE | ID: mdl-32879338

RESUMEN

The purpose of this study is to evaluate the changes in the palatal alveolar bone thickness and find the factors related to the resorption of the palatal alveolar bone caused by tooth movement after the maxillary incisors were retracted and intruded during orthodontic treatment. The study group comprised of 33 skeletal Class II malocclusion patients who underwent extraction for orthodontic treatment. Palatal alveolar bone thickness changes and resorption factors were identified and analyzed. The changes of maxillary central incisors and palatal alveolar bone thickness were measured, and the corresponding sample t test was performed using SPSS (IBM SPSS version 22). The amount of palatal alveolar bone resorption was measured and various parameters were analyzed to determine which factors affected it. Correlation analysis adopting the amount of palatal alveolar bone resorption as a dependent variable demonstrated that the SNB, mandibular plane angle, and the inclination of the maxillary central incisor were significantly correlated with before treatment. On the other hand, mandibular plane angle, angle of convexity, the inclination of the upper incisor, and the occlusal plane (UOP, POP) were significantly correlated with post-treatment. In addition, the variables related to palatal contour (PP to PAS, SN to PAS, palatal surface angle) and occlusal planes (UOP/POP) were significantly correlated with the difference in palatal bone resorption. During initial diagnosis, high angle class II with normal upper incisor inclination can be signs of high-risk factors. In addition, maintaining the occlusal plane during treatment helps to prevent palatal bone loss.

3.
Angle Orthod ; 90(2): 181-186, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-31769700

RESUMEN

OBJECTIVES: To investigate factors associated with spontaneous mesialization of impacted third molars after second molar protraction to close the space caused by a missing mandibular first molar (L-6) or retained deciduous mandibular second molars with a missing succedaneous premolar (L-E). MATERIALS AND METHODS: Panoramic radiographs of patients treated with mandibular second molar protraction to close the space due to missing L-6 or L-E (14 males, 36 females, mean age = 18.6 ± 4.4 years) were analyzed before treatment (T1) and after second molar protraction (T2). Factors associated with the amount of third molar mesialization were investigated using regression analyses. RESULTS: Mandibular second molars were protracted by 5.1 ± 2.1 mm and 5.8 ± 2.7 mm, measured at the crown and root furcation, respectively. After second molar protraction, third molars showed spontaneous mesialization by 4.3 ± 1.6 mm and 3.8 ± 2.6 mm, measured at the crown and root furcation, respectively. Nolla's stage of the third molar at T1 (B = 0.20, P = .026) and second molar protraction time (B = 0.04, P = .042) were significantly associated with the amount of third molar mesialization. CONCLUSIONS: Greater third molar mesialization was observed when Nolla's stage of the third molar was higher before treatment and when the second molar protraction time was longer.


Asunto(s)
Mandíbula , Tercer Molar , Diente Impactado , Adolescente , Adulto , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Diente Molar , Tercer Molar/diagnóstico por imagen , Radiografía Panorámica , Adulto Joven
4.
Prog Orthod ; 20(1): 47, 2019 Dec 23.
Artículo en Inglés | MEDLINE | ID: mdl-31867679

RESUMEN

BACKGROUND: Maxillary incisor protrusion is a prevalent dental deformity and is often treated by upper incisor intrusion and retraction. The mechanical loading triggers the resorption and apposition of the bone. Alveolar bone remodeling is expected to follow orthodontic tooth movement in a one-to-one relationship. However, in many cases, the outcomes are different. Alveolar bone might still remain thick causing lip protrusion and other aesthetic problems after treatment. Additional corrective procedures such as alveoloplasty. On the other hand, if the labial bone becomes too thin, periodontal problems like gingival recession might occur. The unpredictability of the treatment result and the risk of requiring corrective procedures pose significant challenges to both the providers and patients. The aim of this study is to determine factors that can help to predict the alveolar bone reaction before maxillary incisor intrusion and retraction. METHODS: The cohort included 34 female patients (mean age 25.8 years) who were diagnosed with skeletal class II malocclusion with upper incisor protrusion. These patients underwent extraction and orthodontic treatment with upper incisor intrusion and retraction. Lateral cephalograms at pre-treatment and post-treatment were taken. Linear and angular measurements were analyzed to evaluate the alveolar bone changes based on initial conditions. RESULTS: The study found that the relative change, calculated as change in alveolar bone thickness after treatment divided by the initial alveolar thickness, was inversely correlated with the initial thickness. There was a significant increase of labial alveolar bone thickness at 9-mm apical from cementoenamel junction (B3) (P < 0.05) but no statistically significant change in the thickness at other levels. In addition, the change in angulation between the incisor and alveolar bone was inversely correlated with several initial angulations: between the initial palatal plane and upper incisor angle, between the initial palatal plane and upper incisor labial surface angle, and between the initial palatal plane and bone labial surface angle. On the other hand, the change in labial bone thickness was neither significantly correlated with the initial thickness nor significantly correlated to the amount of retraction. CONCLUSION: The unpredictability of alveolar bone remodeling after upper incisor intrusion and retraction poses significant challenges to treatment planning and patient experience. The study showed that the initial angulation between the incisor and alveolar bone is correlated with the change in angulation after treatment, the initial thickness of the alveolar bone was correlated with the relative change of the alveolar bone thickness (defined as change in thickness after treatment divided by its initial thickness), and the amount of intrusion was correlated with the alveolar bone thickness change at 9-mm apical from the cementoenamel junction after treatment. The results of the present study also revealed that the change in labial alveolar bone thickness was neither significantly correlated with the initial thickness nor significantly correlated to the amount of retraction.


Asunto(s)
Estética Dental , Incisivo , Adulto , Remodelación Ósea , Cefalometría , Femenino , Humanos , Maxilar , Técnicas de Movimiento Dental
5.
Am J Orthod Dentofacial Orthop ; 156(2): 178-185, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375227

RESUMEN

INTRODUCTION: This study aimed to identify significant factors affecting the spontaneous angular changes of impacted mandibular third molars as a result of second molar protraction. Temporary skeletal anchorage devices in the missing mandibular first molar (ML-6) or missing deciduous mandibular second molar (ML-E) with missing succedaneous premolar spaces provided traction. METHODS: Forty-one mandibular third molars of 34 patients (10 male and 24 female; mean age 18.3 ± 3.7 years) that erupted after second molar protraction were included in this study. They were classified into upright (U) and tilted (T) groups. Linear and angular measurements were performed at the time of treatment initiation (T1) and of ML-6 or ML-E space closure (T2). Regression analyses were used to identify significant factors related to third molar uprighting. RESULTS: Nolla stage (odds ratio [OR] 4.1), sex (OR 0.003 for male), third molar angulation at T1 (OR 1.1), missing tooth space (OR 0.006), rate of third molar eruption (OR 23.3), and rate of second molar protraction (OR 0.2) significantly affected third molar uprighting. Age, third molar angulation at T1, rate of third molar eruption, and rate of second molar protraction were significant factors for predicting third molar angulation at T2. CONCLUSIONS: Available space for third molar eruption before and after second molar protraction is not associated with uprighting of erupting third molars. Older patients whose third molars are in greater Nolla stage, are in a more upright position at T1, and have a greater eruption rate have a greater chance for third molar uprighting. Alternatively, an increase in second molar protraction rate results in mesial tipping of the third molars.


Asunto(s)
Maloclusión/prevención & control , Maloclusión/fisiopatología , Mandíbula/fisiopatología , Tercer Molar/fisiopatología , Diente Impactado/fisiopatología , Adolescente , Adulto , Puntos Anatómicos de Referencia , Diente Premolar , Femenino , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Mandíbula/anatomía & histología , Mandíbula/diagnóstico por imagen , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Diente Molar/fisiopatología , Tercer Molar/anatomía & histología , Tercer Molar/diagnóstico por imagen , Aparatos Ortodóncicos , Cierre del Espacio Ortodóncico , Ortodoncia Correctiva , Erupción Dental , Diente Primario , Diente Impactado/complicaciones , Diente Impactado/diagnóstico por imagen , Adulto Joven
6.
7.
Am J Orthod Dentofacial Orthop ; 156(1): 113-124, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31256824

RESUMEN

Scissor bite often remains unnoticed by patients although it can adversely affect facial symmetry, jaw growth, and mastication. This case report illustrates the efficacy of temporary skeletal anchorage devices (TSADs) and a modified lingual arch in correcting severe scissor bite. A 28-year-old woman presented with severe scissor bite in the mandibular right posterior segment. To treat this condition, TSADs were used for maxillary posterior intrusion and a modified lingual arch for buccally uprighting mandibular posterior teeth. Long-term retention records demonstrate stable treatment results.


Asunto(s)
Oclusión Dental , Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase I/terapia , Ortodoncia Correctiva/métodos , Adulto , Cefalometría/métodos , Modelos Dentales , Femenino , Humanos , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase I/cirugía , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/cirugía , Mandíbula/diagnóstico por imagen , Mandíbula/patología , Mandíbula/cirugía , Maxilar/diagnóstico por imagen , Maxilar/patología , Maxilar/cirugía , Métodos de Anclaje en Ortodoncia/instrumentación , Métodos de Anclaje en Ortodoncia/métodos , Diseño de Aparato Ortodóncico , Aparatos Ortodóncicos , Alambres para Ortodoncia , Ortodoncia Correctiva/instrumentación , Técnica de Expansión Palatina , Planificación de Atención al Paciente , Factores de Tiempo , Resultado del Tratamiento
9.
Eur J Orthod ; 41(5): 513-518, 2019 Sep 21.
Artículo en Inglés | MEDLINE | ID: mdl-30715310

RESUMEN

OBJECTIVE: To investigate the factors associated with the change in alveolar bone level of mandibular second and third molars after second molar protraction into the space of the missing first molar (L6) or second premolar (LE). METHODS: Fifty-one patients in whom space of the missing L6 or LE was treated with second molar protraction (13 males, 38 females, mean age 19.6 ± 4.7 years) from 2003 to 2015 were included. The alveolar bone level and position and angulation of the mandibular second and third molars were measured in panoramic radiographs at pre-treatment (T1), and after the alignment of the third molars following second molar protraction (T2). Factors associated with alveolar bone loss on the distal aspect of the mandibular second molars were assessed using linear regression analysis. RESULTS: Age at T1 (P < 0.001) and third molar angulation at T1 (P = 0.002) were significant factors for the prediction of alveolar bone level distal to the second molars. LIMITATION: This study used two-dimensional panoramic radiographs, and we could observe only the interproximal bone level. CONCLUSIONS: After second molar protraction into the missing first molar or second premolar space, mandibular second molars may exhibit alveolar bone resorption in the distal root in older patients and in those with mesially tilted third molars before treatment.


Asunto(s)
Tercer Molar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Adolescente , Adulto , Anciano , Diente Premolar/cirugía , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Radiografía Panorámica , Adulto Joven
10.
J Clin Pediatr Dent ; 43(2): 131-136, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-30730802

RESUMEN

Missing posterior teeth and posterior tooth extractions are commonly seen and needed within orthodontic practices. With the invention of temporary skeletal anchorage devices (TSADs), clinicians can now effectively close posterior tooth spaces. Various molar occlusions are discussed to help clinicians envision post-treatment occlusions after posterior teeth space closure using TSADs.


Asunto(s)
Métodos de Anclaje en Ortodoncia , Cierre del Espacio Ortodóncico , Extracción Dental , Humanos , Diente Molar , Técnicas de Movimiento Dental
11.
J Craniomaxillofac Surg ; 47(1): 138-142, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30501927

RESUMEN

The investigators hypothesized there would be differences between the sexes in recovery pattern following bimaxillary orthognathic surgery as measured by patient responses at 5 weeks postprocedure. A total of 378 participants underwent bimaxillary orthognathic surgery with or without adjunctive procedures. Participants received questionnaires 5 weeks postsurgery when they visited the outpatient clinic. The questionnaires include variances in surgical factors by sex, and postoperative symptoms which were most difficult to tolerate experiences by sex, respectively. Females were more likely to undergo malarplasty (zygoma reduction) than were male participants (P = <.001), and they required larger maxillary setback than did male participants (P = .003). Malarplasty was significantly correlated with ear fullness in total and female participants (p-value .018, .016, respectively). Snoring is significantly associated with malarplasty and segment osteotomy procedure without gender predominance (p-value = .026, .028, respectively). Over half of participants complained of nasal congestion (55.6%), followed by swelling (29.3%), pain (15.4%), breathing difficulty (10.6%). In conclusion, males and females showed different patterns of postoperative recovery following bimaxillary orthognathic surgery.


Asunto(s)
Maxilar/cirugía , Cirugía Ortognática/métodos , Procedimientos Quirúrgicos Ortognáticos/métodos , Adulto , Femenino , Humanos , Masculino , Osteotomía Maxilar , Obstrucción Nasal/cirugía , Osteotomía , Complicaciones Posoperatorias/psicología , Factores Sexuales , Encuestas y Cuestionarios , Adulto Joven , Cigoma/cirugía
12.
Angle Orthod ; 88(1): 45-51, 2018 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-28985107

RESUMEN

OBJECTIVE: The purpose of this study was to compare the treatment effects of palatally vs buccally placed temporary anchorage devices. MATERIALS AND METHODS: Of 40 Class II division 1 malocclusion patients, 22 were treated with modified C-palatal plate (MCPP) appliances (age 21.9 ± 6.6 years), and 18 (age 24.2 ± 6.8 years) were treated with buccally placed miniscrews between the maxillary first molar and second premolar. A total of 26 linear and angular measurements were analyzed on pre- and posttreatment lateral cephalograms. Multivariate analysis of variance was performed to evaluate the treatment effects within each group and to compare the effects between groups. RESULTS: Overall, the MCPP appliances showed 4.2 mm of distalization, 1.6 mm of intrusion of the first molar with 2° tipping, and 0.8 mm extrusion of incisors. The miniscrew group resulted in 2.0 mm of distalization, 0.1 mm intrusion of the first molar with 7.2° tipping, and 0.3 mm of incisor extrusion. Regarding soft tissue change, in the MCPP group, the upper lip was significantly retracted ( P < .001). CONCLUSIONS: Comparing the treatment effects between MCPP appliances and buccal miniscrews, the MCPP appliances showed greater distalization and intrusion with less distal tipping of the first molar and less extrusion of the incisor compared to the buccal miniscrews.


Asunto(s)
Placas Óseas , Tornillos Óseos , Maloclusión de Angle Clase II/terapia , Métodos de Anclaje en Ortodoncia/instrumentación , Aparatos Ortodóncicos , Técnicas de Movimiento Dental/instrumentación , Cefalometría , Femenino , Humanos , Masculino , Maloclusión de Angle Clase II/diagnóstico por imagen , Diseño de Aparato Ortodóncico , Resultado del Tratamiento , Adulto Joven
14.
Korean J Orthod ; 47(5): 334-339, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28861395

RESUMEN

OBJECTIVE: Teeth discoloration is a rare orthodontic complication. The aim of this study was to report the clinical progression of discoloration during orthodontic treatment. METHODS: Discolored teeth, detected during orthodontic treatment between January 2003 and December 2012 by a single dentist using similar techniques and appliances, were analyzed. RESULTS: The total number of teeth that showed discoloration was 28. Progression of discoloration was evaluated in only 24 teeth that were observed without any treatment. During the observation period, the discoloration "improved" in 8 of the 24 teeth (33.3%) and was "maintained" in 16 (66.6%). The electric pulp test performed at the time of initial detection of discoloration showed 14.3% positivity, which improved to 21.4% at the final follow-up. None of the initial and final follow-up radiographic findings showed any abnormalities. CONCLUSIONS: When teeth discoloration is detected during orthodontic treatment, observation as an initial management is recommended over immediate treatments.

15.
Am J Orthod Dentofacial Orthop ; 151(3): 572-582, 2017 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-28257742

RESUMEN

A 22-year-old woman came with a unilateral missing mandibular first molar and buccal crossbite. The open space was closed by protraction of the mandibular left second molar and uprighting and protraction of the horizontally impacted third molar using temporary skeletal anchorage devices, and her buccal crossbite was corrected with modified palatal and lingual appliances. The total active treatment time was 36 months. Posttreatment records after 9 months showed excellent results with a stable occlusion.


Asunto(s)
Maloclusión/fisiopatología , Maloclusión/terapia , Tercer Molar/fisiopatología , Cierre del Espacio Ortodóncico/métodos , Diente Impactado/fisiopatología , Diente Impactado/terapia , Femenino , Humanos , Diente Molar/fisiopatología , Métodos de Anclaje en Ortodoncia/instrumentación , Aparatos Ortodóncicos , Radiografía Panorámica , Adulto Joven
16.
Angle Orthod ; 86(4): 565-70, 2016 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-26438976

RESUMEN

OBJECTIVE: To investigate (1) whether vertical eruption of impacted third molars improves after mesialization of second molars and (2) what factors affect the vertical eruption of impacted third molars when space caused by missing molars is successfully closed by mesialization of the second molar using miniscrews. MATERIALS AND METHODS: The treatment group (Group 1) included 52 patients who had (1) missing mandibular first molars (ML-6) or missing deciduous mandibular second molars (ML-E), (2) initially impacted mandibular third molars, and (3) successful space closure of the edentulous area with orthodontics. Panoramic radiographs at start of treatment (T1) and at time of space closure (T2) were collected. The control group (Group 2) included 46 nonedentulous patients with impacted mandibular third molars without molar protraction treatment. Panoramic radiographs with similar T1/T2 treatment times were selected. Nine measurements were obtained regarding horizontal available space, vertical eruption, and third molar angulation. RESULTS: Third molars erupted vertically an average of 2.54 mm in Group 1 compared with 0.41 mm in Group 2. Age, gender, Nolla stage, and angle of the third molars did not show significant correlations with the vertical change of the impacted third molars, whereas the depth of third molar impaction and available space showed significant correlations. CONCLUSIONS: Impacted mandibular third molars vertically erupt as a result of uprighting with mesialization of the second molar, and vertical eruption is affected by the initial vertical location of impacted third molars and available space.


Asunto(s)
Tercer Molar , Erupción Dental , Diente Impactado , Adolescente , Adulto , Humanos , Mandíbula , Diente Molar , Radiografía Panorámica , Estudios Retrospectivos , Adulto Joven
17.
Am J Orthod Dentofacial Orthop ; 143(4 Suppl): S125-36, 2013 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-23540629

RESUMEN

The treatment of adult patients with severe anterior open bite frequently requires orthognathic surgery, especially when the chin is retruded severely. If a patient has multiple missing posterior teeth, it is difficult to control the occlusal plane because it is challenging to obtain anchorage during orthodontic treatment. We report on a 25-year-old woman who had a skeletal Class II malocclusion, severe anterior open bite, vertical maxillary asymmetry, and severe dental caries on her molars. There was no posterior occlusal contact between the maxillary and mandibular molars since 5 of her molars had to be extracted because of severe caries. Lingual fixed appliances and double jaw surgery were performed to treat her skeletal and dental problems, and dental implants helped restore her masticatory function. Pretreatment, posttreatment, and retention photographs demonstrate effective, esthetically pleasing, and stable treatment results.


Asunto(s)
Implantes Dentales , Arcada Parcialmente Edéntula/terapia , Maloclusión de Angle Clase II/terapia , Mordida Abierta/terapia , Procedimientos Quirúrgicos Ortognáticos , Adulto , Cefalometría , Caries Dental/cirugía , Femenino , Mentoplastia , Humanos , Arcada Parcialmente Edéntula/complicaciones , Arcada Parcialmente Edéntula/cirugía , Maloclusión de Angle Clase II/complicaciones , Maloclusión de Angle Clase II/cirugía , Mandíbula/cirugía , Mordida Abierta/complicaciones , Mordida Abierta/cirugía , Aparatos Ortodóncicos , Ortodoncia Correctiva/instrumentación , Osteotomía Le Fort , Osteotomía Sagital de Rama Mandibular , Retrognatismo/cirugía , Extracción Dental
18.
Am J Orthod Dentofacial Orthop ; 143(4 Suppl): S148-60, 2013 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-23540632

RESUMEN

LeFort I osteotomy, anterior segmental osteotomy, bilateral sagittal split ramus osteotomy, and genioplasty are frequently used methods for correcting facial deformities. However, in patients with an abnormally shaped maxilla or mandible, more complex surgical techniques or multiple combinations must be considered for improved esthetic results. This article presents a patient with bialveolar protrusion, mandibular prognathism, chin retrusion, a long face, and severe facial asymmetry. A combination of LeFort I asymmetric impaction, anterior segmental osteotomy, and 3-piece segmentation of the maxilla, and bilateral sagittal split ramus osteotomy, anterior segmental osteotomy, genioplasty advancement, and angle shaving in the mandible were conducted simultaneously. In patients with complicated deformities that cannot be classified by simple conventional classification methods, multisegmental osteotomy can be an option for improved esthetic results.


Asunto(s)
Asimetría Facial/cirugía , Huesos Faciales/anomalías , Anomalías Maxilomandibulares/complicaciones , Anomalías Maxilomandibulares/cirugía , Maloclusión/terapia , Procedimientos Quirúrgicos Ortognáticos/métodos , Adulto , Cefalometría , Mentón/anomalías , Mentón/cirugía , Asimetría Facial/complicaciones , Femenino , Humanos , Maloclusión/complicaciones , Maloclusión/cirugía , Ortodoncia Correctiva/métodos
19.
Am J Orthod Dentofacial Orthop ; 141(6): 783-95, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22640680

RESUMEN

In a young woman, aged 18 years 8 months, who had an anterior open bite and anterior spacing, the right and left mandibular first molar extraction spaces were closed by protraction of the second and third molars without reciprocal retraction of the incisors and the premolars. The amounts of protraction for the second molars were 12 mm on the right side and 11 mm on the left side. Two miniscrews were inserted into the mesiobuccal side of the edentulous spaces, and 2 more screws were inserted into the anterior sites after removing previous miniscrews. In addition, 4 miniscrews were inserted into the buccal and palatal sides between the first and second maxillary molars to intrude the maxillary posterior teeth, which had extruded into the missing mandibular spaces. Careful biomechanical consideration was used to prevent extrusion of the molars and worsening of the anterior open bite from protraction of the posterior teeth. Ultimately, the anterior open bite was corrected by both intrusion of the maxillary molars and extrusion of the maxillary anterior teeth. Excellent occlusion and correction of the anterior open bite were achieved without tipping, rotation of the posterior teeth, or other problems. The right mandibular third molar, which had been impacted at the beginning of treatment, erupted into the second molar space and functioned properly. At the 1-year follow-up examination, the patient had a slight anterior open bite, but closure of the first molar extraction spaces was well maintained.


Asunto(s)
Mordida Abierta/complicaciones , Cierre del Espacio Ortodóncico/métodos , Adolescente , Cefalometría/estadística & datos numéricos , Femenino , Humanos , Diente Molar/fisiopatología , Métodos de Anclaje en Ortodoncia/instrumentación , Técnica de Expansión Palatina/instrumentación , Técnicas de Movimiento Dental , Dimensión Vertical
20.
Angle Orthod ; 72(2): 124-34, 2002 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-11999935

RESUMEN

Patients with obstructive sleep apnea syndrome (OSAS) have characteristic dentofacial features, but the sites of obstruction differ greatly. The purpose of this study was to investigate the dentofacial characteristics of patients with OSAS with respect to the obstructive sites. The subjects consisted of 30 Japanese men with OSAS divided into 3 groups of 10 patients each. One group had obstruction at the retropalatal and retroglossal region (Rp + Rg group), a second group had obstruction at the retropalatal region (Rp group), and a third group had obstruction due to tonsillar hypertrophy (tonsillar hypertrophy group). To identify the Rp + Rg and Rp groups, dynamic magnetic resonance imaging (MRI) was used. To identify the tonsillar hypertrophy group, Mackenzie's classification, axial MRI, and the weight of the tonsils were used. A control group was composed of 10 Japanese men showing no symptoms suggestive of OSAS. Lateral cephalometric radiographs were obtained for all of the subjects, and analysis of variance was performed for the 46 cephalometric parameters. Among the many dentofacial characteristics of OSAS patients, the tendencies for retrognathia, micrognathia, and skeletal Class II were strongest in the Rp + Rg group and somewhat strong in the Rp group. The presence of a long soft palate was dominant in the Rp group, whereas the tendency for a long face was dominant in the tonsillar hypertrophy group. All of the groups shared the characteristic of having an inferior position of the hyoid bone. Based on the results of the current study, we conclude that many features of OSAS are specifically related to each obstructive type of OSAS.


Asunto(s)
Obstrucción de las Vías Aéreas/patología , Apnea Obstructiva del Sueño/patología , Adulto , Anciano , Índice de Masa Corporal , Estudios de Casos y Controles , Cefalometría , Humanos , Hueso Hioides/patología , Imagen por Resonancia Magnética , Masculino , Maloclusión de Angle Clase II/complicaciones , Micrognatismo/complicaciones , Persona de Mediana Edad , Tonsila Palatina/patología , Faringe/patología , Polisomnografía , Retrognatismo/complicaciones , Apnea Obstructiva del Sueño/etiología
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