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1.
J Biol Regul Homeost Agents ; 34(1 Suppl. 1): 115-117, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32064844

RESUMEN

Oral rehabilitation of edentulous maxilla is particularly difficult because of the lack of bone in correspondence of maxillary sinuses, therefore, the surgeon is forced to place implants in sites where bone is more prevalent. In addition, patients require more frequent oral immediate rehabilitation in order to reduce the discomfort related to wearing a total denture. A viable solution to provide stability and retention of the prosthesis in a short time is represented by the technique of intraoral welding supporting total denture or fixed prosthesis. This goal may be achieved thanks to the technique of welding titanium bars onto implant abutments. In fact, the procedure can be performed directly in the mouth, eliminating the possibility of errors or distortions due to prosthetic procedures. This paper describes a case report and the most recent data regarding long-term success and high predictability of intraorally-welded titanium bar in immediate loading implants.


Asunto(s)
Implantes Dentales , Prótesis Dental de Soporte Implantado , Soldadura Dental , Arcada Edéntula , Maxilar/patología , Humanos
2.
J Forensic Sci ; 65(1): 304-313, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-31145812

RESUMEN

In 1949, the American Graves Registration Service Pacific Zone proposed the identification of 27 sets of remains (skulls/crania/mandibles) based on comparisons with written dental records. All were denied, and the remains were buried as unknowns. In 2003 and 2015, the remains were exhumed by the DPAA. Currently, 26 individuals previously recommended for identification have been positively identified. The DPAA Science Director's opinion corresponded with 24 of their recommendations, while DNA excluded three. Caution should be taken by the forensic scientist when building assemblages through skeletal and dental articulation. The forensic odontologist must always consider variations in restorative care/extraction patterns and the possibility of documentation errors when reviewing/interpreting historical and current day dental records used for AM/PM comparisons. The odontologist should base their opinion on the strength of the antemortem/postmortem comparison, number and type of concordances, and distinct dental care and extraction patterns.


Asunto(s)
Restos Mortales , Registros Odontológicos , Odontología Forense/métodos , Amalgama Dental , Prótesis Dental , Exhumación , Historia del Siglo XX , Humanos , Mandíbula/patología , Maxilar/patología , Personal Militar/historia , Fotograbar , Radiografía Dental , Diente/patología , Estados Unidos , Segunda Guerra Mundial
3.
BMC Oral Health ; 19(1): 243, 2019 11 11.
Artículo en Inglés | MEDLINE | ID: mdl-31711493

RESUMEN

BACKGROUND: Follicular lymphoid hyperplasia (FLH) is characterized by an increased number and size of lymphoid follicles. In some cases, the etiology of FLH is unclear. FLH in the oral and maxillofacial region is an uncommon benign entity which may resemble malignant lymphoma clinically and histologically. CASE PRESENTATION: We report the case of a 51-year-old woman who presented with an asymptomatic firm mass in the left posterior maxillary site. Computed tomography scan of her head and neck showed a clear circumscribed solid mass measuring 28 × 23 mm in size. There was no evidence of bone involvement. Incisional biopsy demonstrated benign lymphoid tissue. The patient underwent complete surgical resection. Histologically, the resected specimen showed scattered lymphoid follicles with germinal centers and predominant small lymphocytes in the interfollicular areas. Immunohistochemically, the lymphoid follicles were positive for CD20, CD79a, CD10, CD21, and Bcl6. The germinal centers were negative for Bcl2. Based on these findings, a diagnosis of benign FLH was made. There was no recurrence at 1 year postoperatively. CONCLUSIONS: We diagnosed an extremely rare case of FLH arising from an unusual site and whose onset of entity is unknown. Careful clinical and histopathological evaluations are essential in making a differential diagnosis from a neoplastic lymphoid proliferation with a nodular growth pattern.


Asunto(s)
Tejido Linfoide/patología , Maxilar/patología , Biopsia , Diagnóstico Diferencial , Femenino , Humanos , Hiperplasia , Persona de Mediana Edad
4.
Acta Odontol Latinoam ; 32(2): 88-96, 2019 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-31664299

RESUMEN

The aim of this study was to determine the differences in arch length, inter-canine distance, inter-premolar distance, intermolar distance and arch shape between dental discrepancies (crowding and spacing) in a sample of dental casts from the Afro-Colombian population of San Basilio de Palenque. An analytical, cross-sectional study was conducted on a convenience sample of 63 subjects aged 11 to 57years, of Afro-Colombian origin, with full dentition from first molar to first molar, without extensive caries or restorations, and excluding casts with defects due to loss. The differences between arch (upper and lower) variables were analyzed according to dental discrepancies. Plaster models digitalized with a TR1OS3 Mono scanner with exactitude (6.9 ± 0.9 pm) and precision (4.5 ± 0.9 pm) were analyzed with Orthonalyzer software. Statistical analyses were done on SPSS software (Version 20 for Windows) and Real Statistics. Spacing discrepancy of68.25% was found for upper arch and 66.66% for lower arch; crowding discrepancy of 19.04% for upper arch and 20.63% for lower arch, and an adequate ratio of 12.69% for both arches. No statistically significant difference (p>0.05) was found between arch parameters except for inter-premolar distance on the lower arch. The most frequent arch shape in the population was oval for both upper arch, with 76.19%, and lower arch, with 71.42%. Tooth size was larger in males than females but the difference was not statistically significant.


Asunto(s)
Arco Dental/patología , Maloclusión/etiología , Corona del Diente/patología , Adolescente , Adulto , Cefalometría/estadística & datos numéricos , Niño , Colombia/epidemiología , Estudios Transversales , Coronas , Modelos Dentales , Diastema/etiología , Femenino , Humanos , Masculino , Maloclusión/epidemiología , Maloclusión/patología , Maxilar/patología , Persona de Mediana Edad , Odontometría/estadística & datos numéricos , Tamaño de los Órganos , Adulto Joven
5.
Braz Oral Res ; 33: e086, 2019 Aug 29.
Artículo en Inglés | MEDLINE | ID: mdl-31483052

RESUMEN

Treatment of patients with bisphosphonate usage is a significant concern for oral surgeons because it interferes with jaw bone turnover and regeneration. In case of adverse effects manifesting related to bisphosphonate use, oral surgeons are usually treating and keep the patient's symptoms under control. In this study, we aimed to investigate a new treatment protocol for medication-related osteonecrosis of the jaw (MRONJ). This treatment protocol consisted of administering human parathyroid hormone (hPTH) loaded chitosan microspheres which were prepared by ionotropic gelation method or/and the prepared microspheres were suspended in a poloxamer gel. After in-vitro optimization studies, the efficacy of the chosen formulations was evaluated in-vivo studies. Zoledronic acid was administered daily to forty-eight adult female Sprague-Dawley rats, divided into four experimental groups, at a daily concentration of 0.11 mg/kg over three weeks to induce the MRONJ model. At the end of this period, maxillary left molar teeth were extracted. In the first group, the subjects received no treatment. In the negative control group, poloxamer hydrogel containing empty microspheres were immediately applied to the soft tissues surrounding the extraction socket. The treatment group-1 was treated with local injections of poloxamer hydrogel containing hPTH. The treatment group-2 was treated with a single local injection of poloxamer hydrogel containing hPTH-loaded chitosan microspheres. Both treatment groups received a total of 7 µg of hPTH at the end of the treatment protocol. Our study demonstrates successful attenuation of MRONJ through a local drug delivery system combined with hPTH, as opposed to previously attempted treatment strategies.


Asunto(s)
Conservadores de la Densidad Ósea/farmacología , Quitosano/farmacología , Maxilar/efectos de los fármacos , Hormona Paratiroidea/farmacología , Animales , Osteonecrosis de los Maxilares Asociada a Difosfonatos/tratamiento farmacológico , Osteonecrosis de los Maxilares Asociada a Difosfonatos/etiología , Conservadores de la Densidad Ósea/efectos adversos , Conservadores de la Densidad Ósea/uso terapéutico , Quitosano/uso terapéutico , Preparaciones de Acción Retardada , Femenino , Humanos , Maxilar/patología , Microesferas , Modelos Animales , Hormona Paratiroidea/uso terapéutico , Poloxámero/administración & dosificación , Poloxámero/química , Ratas Sprague-Dawley , Ácido Zoledrónico/efectos adversos
6.
Am J Orthod Dentofacial Orthop ; 156(2): 238-247, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375234

RESUMEN

INTRODUCTION: Tooth agenesis is the most common dental anomaly in humans and is often found in orthodontic patients. However, severe tooth agenesis (oligodontia) is rare and its characteristics are poorly understood. This study aimed to investigate tooth agenesis patterns of Japanese orthodontic patients with nonsyndromic oligodontia. METHODS: Panoramic radiographs of 228 orthodontic patients (141 females, 87 males) with nonsyndromic oligodontia were selected and permanent tooth agenesis excluding third molars was evaluated. Influence of cutoff age was tested, tooth agenesis patterns for each quadrant were calculated, and antagonistic maxillary and mandibular quadrants were merged as the occluding tooth agenesis pattern. Full-mouth tooth agenesis patterns were also evaluated. RESULTS: The highest prevalence of tooth agenesis was observed in maxillary and mandibular second premolars, followed by maxillary first premolars. Prevalence of a symmetric pattern between right and left quadrants was significantly higher than matched patterns between maxillary and mandibular antagonistic quadrants. Among 456 possible tooth agenesis patterns, 51 and 49 patterns were observed for the maxillary and mandibular quadrants, respectively, but 215 patterns for the occluding patterns were observed. In addition, 180 full-mouth tooth agenesis patterns were observed in the 228 patients. CONCLUSIONS: Distinct characteristics in highly ranked patterns were observed compared with studies from other geographic areas, especially in the maxillary arch. Occluding and full-mouth tooth agenesis patterns showed wide variation, suggesting difficulty in orthodontic diagnosis.


Asunto(s)
Anodoncia/epidemiología , Anodoncia/patología , Ortodoncia , Adolescente , Anodoncia/diagnóstico por imagen , Diente Premolar/anomalías , Diente Premolar/diagnóstico por imagen , Niño , Femenino , Humanos , Japón/epidemiología , Masculino , Mandíbula/patología , Maxilar/patología , Tercer Molar/anomalías , Tercer Molar/diagnóstico por imagen , Prevalencia , Radiografía Panorámica , Anomalías Dentarias/epidemiología
7.
Am J Orthod Dentofacial Orthop ; 156(2): 248-256.e2, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375235

RESUMEN

INTRODUCTION: The treatment options for adults with increased overbite are limited to dentoalveolar changes that camouflage the condition. Because of high relapse tendency, defining the problem area is important when creating a treatment plan. This study aimed to evaluate dentoskeletal morphology in skeletal Class I and II anomalies associated with Angle Class I, Class II Division 1 (Class II/1), and Class II Division 2 (Class II/2) malocclusions with increased overbite compared with normal occlusion. METHODS: Pretreatment cephalograms of 306 patients (131 men, 175 women; overall ages 18-45 years) were evaluated. Four groups were constructed. Three groups had increased overbite (>4.5 mm): group 1 (n = 96) skeletal Class I (ANB = 0.5°-4°), group 2 (n = 85) skeletal Class II (ANB >4.5°) with Class II/1; and group 3 (n = 79) skeletal Class II with Class II/2 malocclusion. Group 4 as a control (n = 46) skeletal Class I normal overbite. Dental and skeletal characteristics of the groups were compared by sex. For statistical evaluations, analysis of variance followed by Tukey post hoc, Mann-Whitney U, and Kruskall-Wallis tests were used. Additionally correlation coefficients between overbite and skeletal/dental parameters were calculated. RESULTS: Between sexes, with regard to skeletal parameters, the men had greater values in millimetric measurements, and the women had higher SN/GoGn values. Maxillary/mandibular molar heights and the mandibular incisor heights were higher in men. In group 1, decreased lower anterior facial height (LAFH), retrusive mandibular incisors, and increased interincisal degree were determined. The maxillary molars were intrusive, whereas the vertical position of the mandibular molars and incisors in both jaws were normal. In group 2, retrognathic mandible, increased LAFH and mandibular plane angle, extrusive maxillary/mandibular incisors, protrusive mandibular incisors, and decreased interincisal degree were found. In group 3, decreased LAFH, increased interincisal degree, and retrusive incisors in both jaws were determined. There were significant negative correlations between SN/GoGN, palatal plane, and overbite in group 2 and between ANS-SN and overbite in group 3, and positive correlation between interinsical angle and overbite in all increased overbite groups. CONCLUSIONS: Dental morphology seems to be the main factor of increased overbite. Differences between groups were related primarily to inclinations and vertical positions of the incisors, rather than molar positions.


Asunto(s)
Maloclusión de Angle Clase II/patología , Maloclusión de Angle Clase I/patología , Sobremordida/epidemiología , Sobremordida/patología , Adolescente , Adulto , Análisis de Varianza , Puntos Anatómicos de Referencia , Cefalometría , Femenino , Humanos , Incisivo/patología , Masculino , Maloclusión de Angle Clase III/patología , Mandíbula/patología , Maxilar/patología , Persona de Mediana Edad , Diente Molar/patología , Retrognatismo/patología , Factores Sexuales , Turquia , Adulto Joven
8.
Am J Orthod Dentofacial Orthop ; 156(2): 266-274, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375237

RESUMEN

Adult orthodontic treatment involving maxillary transverse deficiency is a challenge for an interdisciplinary team. Surgically assisted rapid palatal expansion to segment the maxilla was once the treatment of choice, but the invasiveness, bone deficiency, and gingival recession hindered its acceptance. Corticotomy-assisted rapid maxillary arch expansion with ridge augmentation has the advantage of augmenting alveolar bony housing to accommodate and facilitate tooth movement. This approach was used to correct a severely constricted maxilla with bilateral posterior crossbite and anterior crowding in a 46-year-old man. Treatment time was 14 months. The accelerated arch expansion overcame the crossbite in 7 months, increasing intercanine distance by 5.2 mm and intermolar distance by 9.8 mm. Subsequent implant prosthesis was able to be restored in a functional normal occlusion. Satisfactory and stable clinical outcome was followed for 7 years. Corticotomy-assisted rapid maxillary arch expansion with alveolar bone augmentation is a novel and effective interdisciplinary approach for correcting adult maxillary transverse deficiency. Well controlled prospective clinical trails are warranted for further investigation.


Asunto(s)
Aumento de la Cresta Alveolar/métodos , Maloclusión/terapia , Técnica de Expansión Palatina , Técnicas de Movimiento Dental/métodos , Cefalometría , Modelos Dentales , Oclusión Dental , Estudios de Seguimiento , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Maloclusión/patología , Maloclusión/cirugía , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/patología , Maloclusión de Angle Clase II/cirugía , Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase III/cirugía , Maloclusión de Angle Clase III/terapia , Maxilar/anomalías , Maxilar/patología , Maxilar/cirugía , Persona de Mediana Edad , Aparatos Ortodóncicos , Soportes Ortodóncicos , Alambres para Ortodoncia , Paladar (Hueso)/cirugía , Planificación de Atención al Paciente , Estudios Prospectivos , Resultado del Tratamiento
9.
Cient. dent. (Ed. impr.) ; 16(2): 143-148, mayo-ago. 2019. ilus, tab
Artículo en Español | IBECS | ID: ibc-183726

RESUMEN

Introducción: La falta de volumen óseo en el maxilar es un hallazgo habitual en los pacientes que presentan pérdidas dentarias de larga duración. En la actualidad el uso de implantes es la opción más demandada para su rehabilitación, pero para ello son necesarias unas magnitudes mínimas y en los casos que no se presenten, habrá que realizar técnicas de regeneración ósea para que el tratamiento sea viable. Caso clínico: Paciente varón de 58 años de edad que acudió a Servicio de Cirugía Bucal e Implantología del Hospital Virgen de la Paloma de Madrid. Fue diagnosticado hace 7 años de enfermedad periodontal crónica del adulto; tras un periodo de abandono, regresó para la valoración de una rehabilitación completa superior. Se realizó una minuciosa exploración intraoral. Como pruebas complementarias se realizaron una radiografía panorámica y, posteriormente, un estudio tomográfico, donde se observó un insuficiente volumen óseo para el tratamiento implantológico, por lo que se planificó realizar una elevación sinusal bilateral mediante ventana con un injerto autógeno de calota combinado con plasma rico en plaquetas. Conclusiones: El tratamiento de elevación sinusal mediante ventana con injerto de calota es una opción a tener en cuenta para la rehabilitación impantológica de la arcada superior


Introduction: The lack of maxilla bone volume makes the implant treatment difficult. In order to make the implant rehabilitation possible a certain hight is required, which is not enough in this particular case. Therefore a regular sinus lift with lateral approach. Currently, the use of implants is the most demanded option for rehabilitation, but for this minimum magnitudes are necessary and in cases that do not occur, bone regeneration techniques must be performed in order for the treatment to be viable. Clinical case: Male 65 years old patient, arrived at the Oral Surgery service at the Virgen de la Paloma Hospital. No medical or family record of interest. Diagnosed seven years ago with a periodontal chronic disease. After a period of not taking care of it, he returned a few months ago with severe tooth mobility and bone loss, for a full rehabilitation valuation.A meticulous oral inspection was performed. As additional tests, a panoramic radiograph was performed as well as a tomographic test. As a result it was confirmed that the maxilla bone volume was not enough to develop any implant treatment. Therefore it was decided to perform a bilateral sinus lift via a calvarial graft mixed with plateletrich plasma at in hospital environment. Conclusion: The sinus lift treatment via craneal calvarial graft combined with platelet-rich plasma is an option to keep in mind for the full implant rehabilitation of the upper dental arch


Asunto(s)
Humanos , Masculino , Persona de Mediana Edad , Pérdida de Hueso Alveolar/cirugía , Maxilar/cirugía , Atrofia , Cráneo/cirugía , Seno Maxilar/diagnóstico por imagen , Seno Maxilar/cirugía , Supervivencia de Injerto , Pérdida de Hueso Alveolar/diagnóstico por imagen , Pérdida de Hueso Alveolar/patología , Maxilar/diagnóstico por imagen , Maxilar/patología , Trasplante de Tejidos
10.
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
11.
Am J Orthod Dentofacial Orthop ; 156(1): 137-147, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31256827

RESUMEN

A 16-year-old patient sought orthodontic correction for profile improvement and labially inclined maxillary incisors. She had Class II malocclusion, protrusive maxillary and mandibular incisors, and increased overjet and overbite with an American Board of Orthodontics discrepancy index value of 25. She was treated with maxillary premolar extractions and miniscrew-supported en masse retraction assisted with piezoincisions. Extraction spaces (7.5 mm per side) were closed with maximum anchorage in 10 months. Total treatment time was 23 months. Twenty-seven months after debonding, a pink spot was noted at the buccocervial region of the left central incisor. Radiographic evaluation on cone-beam computed tomographic scans revealed a severe case of invasive cervical resorption on both central incisors, around which the piezosurgical cuts had been made. Treatment proceeded with a nonintervention approach and the affected teeth were reinforced with a lingual retainer.


Asunto(s)
Maloclusión de Angle Clase II/terapia , Ortodoncia Correctiva/métodos , Sobremordida/terapia , Piezocirugía/efectos adversos , Adolescente , Diente Premolar/cirugía , Tornillos Óseos , Cefalometría , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Incisivo/diagnóstico por imagen , Incisivo/patología , Incisivo/cirugía , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/cirugía , Mandíbula , 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 , Soportes Ortodóncicos , Alambres para Ortodoncia , Sobremordida/diagnóstico por imagen , Sobremordida/cirugía , Radiografía Panorámica , Resorción Radicular/etiología , Técnicas de Movimiento Dental/métodos , Resultado del Tratamiento , Dimensión Vertical
12.
Biomed Res Int ; 2019: 4934128, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31317031

RESUMEN

Introduction: With an increasing demand for orthodontic treatment for adult patients, orthodontic professionals are constantly seeking novel strategies and technologies that can accelerate tooth movement in order to shorten the treatment period. For instance, in recent years, the influences of different surgical techniques on orthodontic tooth movement in the ipsilateral side of surgery were intensively investigated. Here, we attempt to examine if corticotomy could also affect the rate of tooth movement in the contralateral side of the surgery by using a rodent model. Materials and Methods: 72 eight-week-old Sprague-Dawley rats were randomly divided into three groups as follows: the Control group (orthodontic treatment devices delivered only, no tooth movement), the orthodontic tooth movement (OTM) group (orthodontic treatment devices delivered and orthodontic treatment performed), and the Corticotomy + OTM group (remote corticotomy performed, orthodontic treatment devices delivered, followed by orthodontic treatment). The surgical procedure was conducted on the right side of the maxilla at the time of appliance placement and a force of 60 g was applied between the maxillary left first molar and maxillary incisors using nickel-titanium springs to stimulate OTM. The OTM distance and speed were tracked at 3, 7, 14, and 28 days post-surgery, followed by histological and immunohistochemical assessments. Results: In comparison with orthodontic treatment only, the contralateral corticotomy significantly accelerated OTM. Furthermore, animals undergoing corticotomy + OTM presented with a greater number of osteoclasts on the compression side, stronger staining of the osteogenic marker on the tension side, and higher expression of an inflammatory marker than the OTM group animals. Conclusion: Our current study demonstrates that remote corticotomy effectively accelerates alveolar bone remodeling and OTM. The study enriches our understanding of the regional acceleratory phenomenon (RAP) and offers an alternative strategy for accelerating OTM to shorten the orthodontic treatment period.


Asunto(s)
Remodelación Ósea/efectos de los fármacos , Resorción Ósea/cirugía , Incisivo/cirugía , Osteogénesis/efectos de los fármacos , Animales , Modelos Animales de Enfermedad , Humanos , Incisivo/crecimiento & desarrollo , Incisivo/patología , Maxilar/crecimiento & desarrollo , Maxilar/patología , Maxilar/cirugía , Diente Molar/crecimiento & desarrollo , Diente Molar/patología , Diente Molar/cirugía , Níquel/uso terapéutico , Alambres para Ortodoncia , Osteoclastos/metabolismo , Osteoclastos/patología , Ratas , Titanio/uso terapéutico , Técnicas de Movimiento Dental
13.
J Craniofac Surg ; 30(7): e679-e681, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31306383

RESUMEN

Hemimandibular hyperplasia was first described in 1836 by Adams as a disorder that causes condylar hyperplasia, deforming facial asymmetry and has an unknown etiology. The objective of this study was to report a patient with surgical correction through orthognathic surgery and high condilectomy for the treatment of hemimandibular hyperplasia. The patient complained of pain and cracking in the right temporomandibular joint region and was dissatisfied with the aesthetic appearance of the face. Virtual planning was done for bimaxillary orthognathic surgery and preparation of prototyped surgical guides. Stereolithographic models were used for the preparation of the acrylic guides of the osteotomies for the high condilectomy and the contour of the mandibular base. Orthognathic surgery resulted in the maxillary repositioning with correction of the inclination of the occlusal plane, reduction of the height of the ramus and right mandibular body and class I dental attachment. Mandibular contour osteotomy was performed with acrylic guide in the basilar. The condilectomy was performed by endaural access. In 2-year follow-up, there are no signs of recurrence.


Asunto(s)
Mandíbula/patología , Maxilar/patología , Procedimientos Quirúrgicos Ortognáticos , Adulto , Oclusión Dental , Femenino , Humanos , Hiperplasia , Mandíbula/cirugía , Osteotomía Mandibular/efectos adversos , Procedimientos Quirúrgicos Ortognáticos/métodos
14.
J Clin Neurosci ; 67: 105-108, 2019 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-31229425

RESUMEN

It was previously noticed that patients with Wilson's disease (WD) might have distinct dento-maxillo-facial structures. We performed a case-control study to investigate the characteristics of facial structure between patients with WD and healthy controls. We recruited 44 adult patients with WD and 67 healthy controls and took their lateral cephalometric films. Thirteen angular parameters were used to describe the craniofacial features and evaluated blindly. Our date showed that higher SNA angle, ANB angle, angle of convexity and lower AB angle were detected in both male and female WD group. The average SNA angle in male patient group was 84.23 ±â€¯3.55, larger than the control group (81.52 ±â€¯3.53, p = 0.006) and lower facial proportion was 60.87 ±â€¯12.92%, higher than the control group (56.58 ±â€¯2.51%, p = 0.048). The average SNA angle in female patient group was 83.20 ±â€¯3.75, larger than that in control group (81.06 ±â€¯3.37, p = 0.039). Female neurologically early-onset WD patients (<20 years) had larger SNtoGoGn angle (37.53 ±â€¯5.29 vs 28.46 ±â€¯7.10, p = 0.004), higher lower facial proportion (57.42 ±â€¯1.65% vs 55.53 ±â€¯1.83%, p = 0.03), larger Y-axis (65.12 ±â€¯4.84 vs 58.47 ±â€¯2.72, p = 0.004), larger mandibular plane angle (32.24 ±â€¯5.32 vs 20.90 ±â€¯5.75, p < 0.001) and lower facial angle (85.76 ±â€¯4.36 vs 91.04 ±â€¯2.46, p = 0.009) than the late-onset female patients. In conclusion, we found both male and female WD patients tend to bear some craniofacial features of maxillary protrusion and vertical mandibular growths pattern. Female patients with early onset age of neurological symptoms were more inclined to have vertical mandible growth and mandibular retrusion.


Asunto(s)
Degeneración Hepatolenticular/patología , Mandíbula/patología , Maxilar/patología , Adulto , Estudios de Casos y Controles , Cefalometría , Cara/patología , Femenino , Humanos , Masculino
15.
Pathol Int ; 69(6): 360-365, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-31215141

RESUMEN

A fungal ball of a maxillary sinus sometimes includes dental treatment-related foreign material because the sinus is close to the root of the upper teeth. We present a case of right maxillary sinus fungal ball with a gutta-percha point, a dental root canal filler. X-ray analysis of the foreign material in the paraffin section of the fungal ball successfully detected zinc, sulfur, and barium, all of which were constituents of the gutta-percha point. The gutta-percha point might have facilitated the formation of the fungal ball through disruption of the sinus-clearing mechanism. Another interesting histological feature of the fungal ball was the finding of calcium oxalate crystals and non-hyphal fungal elements such as cleistothecia, Hülle cells, and conidial heads. This is the first report of such a combination being found in a specimen of human fungal disease. Although fungal culture was not available in the present case, molecular analysis of the formalin-fixed paraffin-embedded tissue of the fungal ball succeeded in revealing only DNA sequences of Aspergillus nidulans and some other environmental Aspergillus spp.


Asunto(s)
Cavidad Pulpar/patología , Maxilar/patología , Seno Maxilar/microbiología , Seno Maxilar/patología , Aspergillus nidulans/patogenicidad , Cavidad Pulpar/microbiología , Proteínas Fúngicas/metabolismo , Gutapercha , Humanos , Masculino , Maxilar/microbiología , Persona de Mediana Edad , Micosis/diagnóstico , Micosis/patología , Diente/microbiología , Diente/patología
16.
J Appl Oral Sci ; 27: e20180434, 2019 Jun 13.
Artículo en Inglés | MEDLINE | ID: mdl-31215598

RESUMEN

This study aimed to compare the linear dimensions of the dental arches of adult patients with complete unilateral cleft lip and palate (UCLP) after orthodontic and prosthetic treatment with fixed partial dentures (FPD) to patients without clefts, using 3D technology. This retrospective longitudinal study sample consisted of 35 subjects divided into two groups. Included in this sample were 15 complete UCLP individuals who had received orthodontic treatment before rehabilitation with a fixed partial denture (FG), as well as 20 patients without cleft as control group (CG). All patients were aged between 18 and 30 years. Digital dental casts were obtained in two stages: (T1) end of orthodontic treatment and (T2) one year after prosthetic rehabilitation (FG); and (T1) end of orthodontic treatment and (T2) one year after removal of the orthodontic appliance (CG). Intercanine, interfirst premolar and intermolar distances, and incisor-molar length were obtained. A precalibrated and trained examiner performed the assessments. Intergroup differences between T2 and T1 were compared between the groups using the t test or Mann-Whitney test with a significance level of 5% (p<0.05). The intercanine distance variation (T2-T1) showed statistical difference (p=0.005) increasing in the FG group and decreasing in the CG group. In the interfirst premolar distance variation, FG decreased, while CG increased with statistically significant difference (p=0.008). The intercanine distance of individuals with cleft showed stability, while that of the CG had no stability. The CG showed stability in the interfirst premolar distance, while FG had no stability. These findings showed that the FPD is capable of restricting orthodontic results, leading to a stabilization of the dental arches.


Asunto(s)
Labio Leporino/rehabilitación , Fisura del Paladar/rehabilitación , Arco Dental/patología , Prótesis Dental de Soporte Implantado/métodos , Imagen Tridimensional/métodos , Ortodoncia Correctiva/métodos , Adolescente , Adulto , Puntos Anatómicos de Referencia , Labio Leporino/patología , Fisura del Paladar/patología , Femenino , Humanos , Masculino , Maxilar/patología , Aparatos Ortodóncicos , Valores de Referencia , Estudios Retrospectivos , Estadísticas no Paramétricas , Resultado del Tratamiento , Adulto Joven
17.
Acta Odontol Latinoam ; 32(1): 44-48, 2019 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-31206574

RESUMEN

Clinically, Molar-Incisor Hypomineralization (MIH) lesions are not distributed symmetrically, and their severity varies even within the same arcade. AIM: To estimate the frequency of asymmetries in hypomineralized lesions on permanent molars and incisors of children with MIH. METHODS: Three pediatric dentists, calibrated following the diagnostic criteria of Mathu-Muju and Wright (2006) (Kappa 0.87) identified presence and severity of opacities on molars and incisors of patients with MIH. Six pairs of teeth (permanent maxillary and mandibular first molars, central and lateral incisors) were evaluated in each patient. Degree of lesion severity (0-none, 1-mild, 2-moderate, 3-severe) was recorded for each tooth. For each pair containing any affected teeth, asymmetry of presence (one tooth in the pair with lesion and the other intact), asymmetry of severity (both teeth with lesions but with different degrees of severity) or symmetry of severity (both affected teeth with the same degree of severity) were evaluated. The recorded values were entered into a database to calculate percentages, 95% confidence intervals and Chi-Square test for comparisons. RESULTS: The sample consisted of475 of the 1032 pairs of teeth evaluated in the 172 patients included in the study, mean age 11±2.2 years, and 50% female. Asymmetry was found for 67.5% (63.1 - 71.7) of the pairs of the studied teeth. There was a significant relationship between asymmetries and symmetries (p=0.038). A total 50.1% of the pairs were asymmetrical for presence of opacities. Of these, 62.2% scored severity 1 (mild). Symmetry of severity was found for 32.5% of the lesions. Among the pairs of affected teeth, the most frequently observed degrees of lesion severity were mild and moderate, with the exception of lower molars, in which 49% had severe lesions. CONCLUSIONS: In this study, MIH lesions were asymmetrical both in presence and severity for all tooth types.


Asunto(s)
Hipoplasia del Esmalte Dental/epidemiología , Incisivo/patología , Maxilar/patología , Diente Molar/patología , Desmineralización Dental/epidemiología , Adolescente , Argentina/epidemiología , Niño , Hipoplasia del Esmalte Dental/clasificación , Femenino , Humanos , Masculino , Prevalencia , Índice de Severidad de la Enfermedad , Desmineralización Dental/clasificación
18.
Comput Methods Programs Biomed ; 176: 195-209, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31200906

RESUMEN

BACKGROUND AND OBJECTIVE: The orthopedic Maxillary Expansion (ME) procedure is used for treating the transverse maxillary deficiency. This pathology consists in a smaller transverse dimension in the maxilla and leads to malocclusion. The treatment takes advantage of the existence of the midpalatal suture (MPS), which corresponds to the junction at the palatine bones of its horizontal portions. The technique employs a device, conventionally a palatal expander attached to the posterior teeth, to separate the two maxillary bones in the MPS. The objective of this study was to analyze, using the Finite Element Method, the biomechanical behavior of the MPS when an expansion is applied. METHODS: A Computer Tomography image of the maxilla was reconstructed, the suture geometry was modeled with different interdigitation levels and types of hyrax devices. A total of 12 geometric models (three levels for interdigitation and four types of hyrax devices) were prepared and analyzed taking into account the chewing forces and the expansion displacement. For each case, maximum principal stresses on the maxilla (bone), and equivalent stresses on the expander device (stainless steel) were observed. In the MPS, maximum principal stresses and directional displacement were evaluated. RESULTS: The results showed that the interdigitation does not have an important influence on the deformation behavior of the maxilla but it affects the stress distribution. In addition, the type of expander device and anchorage have a direct relationship with the treatment effectiveness; larger deformation in the expansion direction was obtained with skeletal when compared to dental anchorage. CONCLUSIONS: A study that allows a better understanding of the oral biomechanics during the application of ME was presented. To our knowledge, it is the first study based on computational simulations that takes into account bone structures, like maxilla and part of the skull, to analyze the interdigitation influence on the MPS behavior when exposed to a ME.


Asunto(s)
Maxilar/patología , Técnica de Expansión Palatina/instrumentación , Paladar (Hueso)/fisiología , Fenómenos Biomecánicos , Simulación por Computador , Análisis de Elementos Finitos , Humanos , Imagen Tridimensional/métodos , Modelos Anatómicos , Estrés Mecánico , Diente
19.
BMC Oral Health ; 19(1): 125, 2019 06 21.
Artículo en Inglés | MEDLINE | ID: mdl-31226972

RESUMEN

BACKGROUND: The removal of maxillary carcinoma causes various types of tissue defects, which can be corrected by free flap reconstruction. In flap reconstruction after maxillary cancer resection, ensuring prosthesis stability is frequently difficult owing to the flap's weight. Therefore, a second modification technique is required for improvement of configuration. This case where flap suspension and flap modifying surgery were performed using anchor system for the extensive complete maxillectomy case. CASE PRESENTATION: The patient was a 56-year-old male, who underwent an extensive total maxillectomy and flap reconstruction using the rectus abdominus muscles in May 2005. Postoperatively, due to the difficulties of wearing a maxillary denture, he was transferred to our department with the chief complaint of morphological improvement. The maxillary bone had already been removed from the midline with the rectus abdominus muscle flap sutured directly to the soft palate without oral vestibule, and the flap margin was moving together with the surrounding soft tissue. The flap size was 70 × 50 mm, which was sagging due to its own weight and was in contact with mandibular molars, reducing the volume of the oral cavity without a denture being worn. Flap reduction and lifting the flap were performed under general anesthesia using 3 Mitek anchors implanted in the zygomatic bone, and the anchor suture was placed through the subcutaneous tissue to lift the flap. Postoperatively, the prosthesis was stable. No recurrence of flap sagging or wound infection was seen 3 years after surgery. CONCLUSIONS: The second modification technique after maxillary cancer resection is useful for ensuring prosthesis stability. This method can be used before prosthesis addition. We could obtain remarkable denture stability by flap suspension using anchor system and a flap-modifying operation for the patient who had undergone maxilloecotomy. The denture was stabilized by using anchors for the elevated flap and flap loss technique and by performing vestibuloplasty for support.


Asunto(s)
Maxilar/cirugía , Neoplasias Maxilares/cirugía , Procedimientos Quirúrgicos Reconstructivos/métodos , Colgajos Quirúrgicos , Humanos , Masculino , Maxilar/patología , Neoplasias Maxilares/patología , Prótesis Maxilofacial , Persona de Mediana Edad , Recurrencia Local de Neoplasia , Prótesis e Implantes , Resultado del Tratamiento , Vestibuloplastia
20.
Am J Orthod Dentofacial Orthop ; 155(5): 681-692, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-31053284

RESUMEN

PURPOSE: The purpose of this study was to determine how micro-osteoperforations (MOPs) affect tooth movements, bone turnover, bone density, and bone volume. METHODS: A split-mouth experimental design with 7 beagle dogs was used to evaluate bone surrounding maxillary second premolars that had been retracted for 7 weeks. One month after the maxillary third premolars were extracted, 8 MOPs (1.5 mm wide and 7 mm deep) were created without flaps with the use of the Propel device (6 were placed 3 mm distal to the second premolar and 2 were placed in the premolar furcation) on one randomly chosen side. The maxillary second premolars were retracted bilaterally with the use of 200 g nickel-titanium closed coil springs. Tooth movements were measured intraorally and radiographically. Microscopic computed tomography was used to evaluate the material density and volume fraction of bone distal to the premolars. Hematoxylin and eosin-stained and fluorescent sections were used to examine the bone remodeling. RESULTS: Neither the intraoral (P = 0.866) nor radiographic (P = 0.528) measures showed statistically significant side differences in tooth movements. There also were no statistically significant differences in the density (P = 0.237) or volume fraction (P = 0.398) of bone through which the premolars were being moved. Fluorescent and histologic evaluations showed no apparent differences in osteoblasts, osteoclasts, or mineralization of bone near the teeth being moved. Bone healing was evident in and near the MOP sites, which had nearly but not completely healed after 7 weeks. Regions of acellular bone were evident extending ∼0.8 mm from the MOP sites. CONCLUSIONS: MOPs placed 3 mm away from teeth do not increase tooth movements and have limited and transitory effect on bone.


Asunto(s)
Prótesis Dental , Técnicas de Movimiento Dental/instrumentación , Animales , Diente Premolar/cirugía , Densidad Ósea/fisiología , Remodelación Ósea/fisiología , Diseño de Prótesis Dental , Perros , Maxilar/patología , Microtomografía por Rayos X
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