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2.
J Korean Assoc Oral Maxillofac Surg ; 48(1): 63-67, 2022 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-35221309

RESUMO

Controversies exist regarding the need for prophylactic extraction of mandibular third molars in patients who plan to undergo orthognathic surgery. An 18-year-old male patient was diagnosed with mandibular prognathism and maxillary retrognathism with mild facial asymmetry. He had a severely damaged mandibular first molar and a horizontally impacted third molar. After extraction of the first molar, the second molar was protracted into the first molar space, and the third molar erupted into the posterior line of occlusion. The orthognathic surgery involved clockwise rotation of the maxillomandibular complex as well as angle shaving and chin border trimming. Patients who are missing or have damaged mandibular molars should be monitored for eruption of third molars to replace the missing posterior tooth regardless of the timing of orthognathic surgery.

3.
Angle Orthod ; 92(1): 64-72, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-34587241

RESUMO

OBJECTIVES: To assess the changes in alveolar bone of the mandibular second molars following molar protraction and investigate the factors associated with the alveolar bone changes. MATERIALS AND METHODS: Cone-beam computed tomography of 29 patients (mean age 22.0 ± 4.2 years) who had missing mandibular premolars or first molars and underwent molar protraction were reviewed. Alveolar bone level was measured as the distance from the cementoenamel junction at six points, buccal, lingual, mesiobuccal (MB), mesiolingual (ML), distobuccal (DB), and distolingual (DL), of the second molars at pretreatment (T0) and after molar protraction (T1). Factors associated with alveolar bone changes at the distal and mesial of the second molars were assessed. RESULTS: Mean alveolar bone changes ranged from -1.2 mm (bone apposition) to 0.8 mm (bone resorption). The presence of a third molar impaction at T0 (P < .001), third molar angulation at T0 (P < .001), and Nolla's stage of third molar at T0 (P = .005) were significantly associated with alveolar bone level changes distal to the second molars. Treatment duration (P = .028) was significantly associated with alveolar bone level changes mesial to the second molar. CONCLUSIONS: Patients with impacted third molars, third molars at an earlier stage of development, and mesially angulated third molars at pretreatment may have less alveolar bone resorption distal to the second molars following protraction. Patients with increased treatment time may have reduced alveolar bone resorption mesial to the second molars.


Assuntos
Mandíbula , Dente Impactado , Adolescente , Adulto , Dente Pré-Molar/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico , Humanos , Mandíbula/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Dente Serotino/diagnóstico por imagem , Adulto Jovem
4.
Angle Orthod ; 90(6): 890, 2020 11 01.
Artigo em Inglês | MEDLINE | ID: mdl-33126258

Assuntos
Dente Serotino
5.
Sci Rep ; 10(1): 14454, 2020 09 02.
Artigo em Inglês | MEDLINE | ID: mdl-32879338

RESUMO

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.


Assuntos
Processo Alveolar/diagnóstico por imagem , Incisivo/crescimento & desenvolvimento , Palato/crescimento & desenvolvimento , Técnicas de Movimentação Dentária , Adulto , Processo Alveolar/crescimento & desenvolvimento , Cefalometria , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Incisivo/diagnóstico por imagem , Masculino , Maxila/diagnóstico por imagem , Maxila/crescimento & desenvolvimento , Palato/diagnóstico por imagem , Adulto Jovem
6.
J Korean Assoc Oral Maxillofac Surg ; 46(1): 70-77, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32158684

RESUMO

Osteogenesis imperfecta is a heterogeneous group of connective tissue diseases that is predominantly characterized by bone fragility and skeletal deformity. Two siblings with undiagnosed type I osteogenesis imperfecta underwent orthognathic surgery for the treatment of facial asymmetry and mandibular prognathism. The authors report two cases of combined orthodontics and orthognathic surgery in patients with type I osteogenesis imperfecta, mandibular prognathism, and facial asymmetry.

7.
Angle Orthod ; 90(2): 181-186, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-31769700

RESUMO

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.


Assuntos
Mandíbula , Dente Serotino , Dente Impactado , Adolescente , Adulto , Feminino , Humanos , Masculino , Mandíbula/diagnóstico por imagem , Dente Molar , Dente Serotino/diagnóstico por imagem , Radiografia Panorâmica , Adulto Jovem
8.
Prog Orthod ; 20(1): 47, 2019 Dec 23.
Artigo em Inglês | MEDLINE | ID: mdl-31867679

RESUMO

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.


Assuntos
Estética Dentária , Incisivo , Adulto , Remodelação Óssea , Cefalometria , Feminino , Humanos , Maxila , Técnicas de Movimentação Dentária
10.
Am J Orthod Dentofacial Orthop ; 156(2): 178-185, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31375227

RESUMO

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.


Assuntos
Má Oclusão/prevenção & controle , Má Oclusão/fisiopatologia , Mandíbula/fisiopatologia , Dente Serotino/fisiopatologia , Dente Impactado/fisiopatologia , Adolescente , Adulto , Pontos de Referência Anatômicos , Dente Pré-Molar , Feminino , Humanos , Masculino , Má Oclusão/diagnóstico por imagem , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Dente Molar/anatomia & histologia , Dente Molar/diagnóstico por imagem , Dente Molar/fisiopatologia , Dente Serotino/anatomia & histologia , Dente Serotino/diagnóstico por imagem , Aparelhos Ortodônticos , Fechamento de Espaço Ortodôntico , Ortodontia Corretiva , Erupção Dentária , Dente Decíduo , Dente Impactado/complicações , Dente Impactado/diagnóstico por imagem , Adulto Jovem
11.
Am J Orthod Dentofacial Orthop ; 156(1): 113-124, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31256824

RESUMO

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.


Assuntos
Oclusão Dentária , Má Oclusão Classe II de Angle/terapia , Má Oclusão Classe I de Angle/terapia , Ortodontia Corretiva/métodos , Adulto , Cefalometria/métodos , Feminino , Humanos , Má Oclusão Classe I de Angle/diagnóstico por imagem , Má Oclusão Classe I de Angle/cirurgia , Má Oclusão Classe II de Angle/diagnóstico por imagem , Má Oclusão Classe II de Angle/cirurgia , Mandíbula/diagnóstico por imagem , Mandíbula/patologia , Mandíbula/cirurgia , Maxila/diagnóstico por imagem , Maxila/patologia , Maxila/cirurgia , Modelos Dentários , Procedimentos de Ancoragem Ortodôntica/instrumentação , Procedimentos de Ancoragem Ortodôntica/métodos , Desenho de Aparelho Ortodôntico , Aparelhos Ortodônticos , Fios Ortodônticos , Ortodontia Corretiva/instrumentação , Técnica de Expansão Palatina , Planejamento de Assistência ao Paciente , Fatores de Tempo , Resultado do Tratamento
13.
J Clin Pediatr Dent ; 43(2): 131-136, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30730802

RESUMO

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.


Assuntos
Procedimentos de Ancoragem Ortodôntica , Fechamento de Espaço Ortodôntico , Extração Dentária , Humanos , Dente Molar , Técnicas de Movimentação Dentária
14.
Eur J Orthod ; 41(5): 513-518, 2019 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-30715310

RESUMO

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.


Assuntos
Dente Serotino/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Adolescente , Adulto , Idoso , Dente Pré-Molar/cirurgia , Feminino , Humanos , Masculino , Mandíbula/diagnóstico por imagem , Radiografia Panorâmica , Adulto Jovem
15.
J Craniomaxillofac Surg ; 47(1): 138-142, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30501927

RESUMO

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.


Assuntos
Maxila/cirurgia , Cirurgia Ortognática/métodos , Procedimentos Cirúrgicos Ortognáticos/métodos , Adulto , Feminino , Humanos , Masculino , Osteotomia Maxilar , Obstrução Nasal/cirurgia , Osteotomia , Complicações Pós-Operatórias/psicologia , Fatores Sexuais , Inquéritos e Questionários , Adulto Jovem , Zigoma/cirurgia
16.
Angle Orthod ; 88(1): 45-51, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28985107

RESUMO

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.


Assuntos
Placas Ósseas , Parafusos Ósseos , Má Oclusão Classe II de Angle/terapia , Procedimentos de Ancoragem Ortodôntica/instrumentação , Aparelhos Ortodônticos , Técnicas de Movimentação Dentária/instrumentação , Cefalometria , Feminino , Humanos , Masculino , Má Oclusão Classe II de Angle/diagnóstico por imagem , Desenho de Aparelho Ortodôntico , Resultado do Tratamento , Adulto Jovem
18.
Korean J Orthod ; 47(5): 334-339, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28861395

RESUMO

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.

19.
Am J Orthod Dentofacial Orthop ; 151(3): 572-582, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28257742

RESUMO

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.


Assuntos
Má Oclusão/fisiopatologia , Má Oclusão/terapia , Dente Serotino/fisiopatologia , Fechamento de Espaço Ortodôntico/métodos , Dente Impactado/fisiopatologia , Dente Impactado/terapia , Feminino , Humanos , Dente Molar/fisiopatologia , Procedimentos de Ancoragem Ortodôntica/instrumentação , Aparelhos Ortodônticos , Radiografia Panorâmica , Adulto Jovem
20.
Angle Orthod ; 86(4): 565-70, 2016 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-26438976

RESUMO

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.


Assuntos
Dente Serotino , Erupção Dentária , Dente Impactado , Adolescente , Adulto , Humanos , Mandíbula , Dente Molar , Radiografia Panorâmica , Estudos Retrospectivos , Adulto Jovem
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