Are open mandibular fractures still an emergency?

INTRODUCTION: Early surgical management is often advocated for fractures of the tooth-bearing portion of the mandible. A 6-hour delay has been mentioned for the fixation of these fractures. Our aim was to bring this paradigm into question. METHODS: All patients referred to our department from September 2012 to May 2014 for fractures of the tooth-bearing portion of the mandible were retrospectively included. For each patient, age, gender, aetiology of the fracture, and characteristics of the fractures were recorded. Tobacco and/or alcohol addictions, diabetes and mandibular dental condition were taken into account. We also noticed the preoperative delay and the occurrence of complications such as: haematoma, infection, wound dehiscence, osteosynthesis failure and pseudarthrosis. RESULTS: Among the 47 patients referred, 36 were treated with a delay of more than 6hours (76.6%). In 88.8% of the cases, the reason for this delay was unavoidable. The mean delay time from trauma to surgery was 52hours (range: 7-312). Forty-nine percent of the patients had comorbidities. Complications occurred in 6 patients leading to an overall complication rate of 16.67%. A statistically significant higher complication rate was observed among smokers (P=0.006). No statistical relationship was found between the delay and the occurrence of complications (P=0.994). This study suggests that fractures of the tooth-bearing portion of the mandible should no longer be considered as an emergency that must be treated within a 6-hour delay.

Sharp mandibular bone irregularities after lower third molar extraction: Incidence, clinical features and risk factors

Objectives: The purpose of this study was to determine the incidence and clinical symptoms associated with sharp mandibular bone irregularities (SMBI) after lower third molar extraction and to identify possible risk factors for this complication. Study Design: A mixed study design was used. A retrospective cohort study of 1432 lower third molar extractions was done to determine the incidence of SMBI and a retrospective case-control study was done to determine potential demographic and etiologic factors by comparing those patients with postoperative SMBI with controls. Results: Twelve SMBI were found (0.84%). Age was the most important risk factor for this complication. The operated side and the presence of an associated radiolucent image were also significantly related to the development of mandibular bone irregularities. The depth of impaction of the tooth might also be an important factor since erupted or nearly erupted third molars were more frequent in the SMBI group. Conclusions: SMBI are a rare postoperative complication after lower third molar removal. Older patients having left side lower third molars removed are more likely to develop this problem. The treatment should be the removal of the irregularity when the patient is symptomatic

Avaliação da prevalência do tratamento das fraturas de côndilo mandibular

OBJETIVO: Realizar um estudo do tratamento das fraturas do côndilo mandibular e discutir a terapêutica conservadora versus a cirúrgica. MÉTODOS: Foram examinados 892 prontuários de traumatismo bucofacial, e selecionados aqueles em que haviam: relatos de fraturas condilares isoladas ou associadas a outros ossos da face, dados relativos à identificação, a história médico-odontológica, e o tratamento para a fratura de côndilo. Os dados foram analisados através de estatística descritiva e comparados a~ terapêuticas conservadora e cirúrgica. RESULTADOS: As fraturas de côndilo perfizeram um total de 124 casos. O sexo masculino representou 72,0% da amostra, e a faixa etária mais acometida foi aquela dos 21 a 30 anos. O tratamento conservador foi empregado em 61,0% dos pacientes. CONCLUSÃO: O tratamento cirúrgico foi utilizado em pacientes acima de dez anos de idade, vítimas de acidentes de trânsito e quedas, predominantemente, seguido de agressões, armas de fogo e acidente esportivo.

Surto de abscesso mandibular por Pseudomonas aeruginosa em ovinos

Descreve-se um surto de abscesso mandibular em ovelhas da raça Bergamácia no município de Botucatu, estado de São Paulo. Do rebanho de 120 animais, 35 apresentaram aumento de volume mandibular com a presença de nódulos únicos, de consistência pétrea, de diferentes tamanhos, fistulados ou não e sem indicativos de inflamação dos tecidos moles adjacentes. Os animais eram criados em pasto de Panicum maximum cv. Tanzânia com água e sal mineral ad libitum e everminados, via oral, com pistolas dosificadoras. O material para diagnóstico microbiológico e antibiograma foi coletado de cinco animais acometidos, por punção e aspiração dos nódulos. Dos 35 animais acometidos, 19 foram submetidos ao exame radiográfico, um ao exame tomográfico e outro à biópsia óssea da região submandibular. O único ovino que morreu, encontrava-se em estado de caquexia provavelmente devido à localização do aumento de volume que afetou a implantação dos dentes molares daquela região impedindo a apreensão e mastigação adequadas levando a perda da condição corporal e morte. Ao exame necroscópico, observaram-se áreas de necrose caseosa na mandíbula direita de onde isolou-se Pseudomonas aeruginosa. O tratamento utilizado foi baseado na aplicação de iodeto de sódio a 10% por via intramuscular e antibioticoterapia segundo antibiograma com enrofloxacina por via intramuscular, porém com pouca eficácia. Diante do quadro clínico, dos dados de anamnese, da localização das lesões no tecido ósseo mandibular, do resultado do cultivo microbiológico, das alterações radiográficas e tomográficas foi feito o diagnóstico de abscesso mandibular causado por Pseudomonas aeruginosa.

Efficacy and safety of combined piroxicam, dexamethasone, orphenadrine, and cyanocobalamin treatment in mandibular molar surgery

Third molar extraction is a common procedure frequently accompanied by moderate or severe pain, and involves sufficient numbers of patients to make studies relatively easy to perform. The aim of the present study was to determine the efficacy and safety of the therapeutic combination of 10 mg piroxicam, 1 mg dexamethasone, 35 mg orphenadrine citrate, and 2.5 mg cyanocobalamin (Rheumazin®) when compared with 20 mg piroxicam alone (Feldene®) in mandibular third molar surgery. Eighty patients scheduled for removal of the third molar were included in this randomized and double-blind study. They received (vo) Rheumazin or Feldene 30 min after tooth extraction and once daily for 4 consecutive days. Pain was determined by a visual analogue scale and by the need for escape analgesia (paracetamol). Facial swelling was evaluated with a measuring tape and adverse effects and patient satisfaction were recorded. There was no statistically significant difference in facial swelling between Rheumazin and Feldene (control group). Both drugs were equally effective in the control of pain, with Rheumazin displaying less adverse effects than Feldene. Therefore, Rheumazin appears to provide a better risk/benefit ratio in the mandibular molar surgery. Since the side effects resulting from nonsteroidal anti-inflammatory drug administration are a severe limitation to the routine use of these drugs in clinical practice, our results suggest that Rheumazin can be a good choice for third molar removal treatment.

Psychological stress alters the ultrastructure and increases IL-1β and TNF-α in mandibular condylar cartilage

Psychological factors can be correlated with temporomandibular disorders (TMDs), but the mechanisms are unknown. In the present study, we examined the microstructural changes and expression of proinflammatory cytokines in mandibular condylar cartilage of the temporomandibular joint (TMJ) in a psychological stress animal model. Male Sprague-Dawley rats (8 weeks old, 210 ± 10 g) were randomly divided into 3 groups: psychological stress (PS, N = 48), foot shock (FS, N = 24), and control (N = 48). After inducing psychological stress using a communication box with the FS rats for 1, 3, or 5 weeks, PS rats were sacrificed and compared to their matched control littermates, which received no stress and were killed at the same times as the PS rats. Body and adrenal gland weight were measured and corticosterone and adrenocorticotropic hormone levels were determined by radioimmunoassay. After hematoxylin-eosin staining for histological observation, the ultrastructure of the TMJ was examined by scanning electron microscopy. Transcription and protein levels of interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) were evaluated by ELISA and semi-quantitative RT-PCR. The PS group showed a significantly higher adrenal gland weight after 3 weeks of stress and higher hormone levels at weeks 1, 3, and 5. Histopathological changes and thinning cartilage were apparent at weeks 3 and 5. In the PS group, TNF-α increased at 1, 3, and 5 weeks and IL-1β increased significantly after 1 and 3 weeks of stress, and then decreased to normal levels by 5 weeks. Psychological stress increased plasma hormone levels and RT-PCR indicated increased IL-1β and TNF-α expression in the TMJ in a time-dependent manner. These results suggest that cytokine up-regulation was accompanied by stress-induced cartilage degeneration in the mandibular condyle. The proinflammatory cytokines play a potential role in initiating the cartilage destruction that eventually leads to the TMDs.

Disfunción temporo mandibular en los diferentes tipos de maloclusión [por] Caludia Garza Cerna

Tesis (Maestría en Salud Pública con Especialidad en Odontología Social) U.A.N.L.

Recidiva postratamiento ortodóncico en la arcada mandibular por Juana Nelly Leal Camarillo

Tesis (Maestría en Ciencias Odontológicas con Especialidad en Ortodoncia) U.A.N.L.

Distracción osteogénica mandibular intraoral transversal por Esteban Bendaña McEwan

Tesis (Maestría en Ciencias Odontológicas con Especialidad en Ortodoncia) U.A.N.L.

Estudio comparativo entre Lip Bumper modificado con escudos laterales y el Lip Bumper simple para lograr la expansión transversal dentoalveolar mandibular

Tesis ( Maestría en Ciencias Odontológicas con Especialidad en Ortodoncia) U.A.N.L.

Análisis biomecánico de osificación en distracción osteogénica mandibular utilizando terapia génica ex - vivo. Un modelo canino.

Tesis (Doctor en Medicina) UANL, 2011.

A randomized controlled trial evaluating the quality of life and the sense of coherence in seniors wearing complete conventional dentures or mandibular two-implant overdentures

La supériorité des prothèses mandibulaires retenues par deux implants (IODs) sur les prothèses conventionnelles (CDs) nécessitent d’être éclaircies notamment en rapport à leur influence sur la qualité de vie reliée à la santé bucco-dentaire (OHRQoL) ainsi que sur la stabilité de cet effet de traitement. De plus, l’influence des facteurs psychologiques, tel que le sens de cohérence (SOC), sur l’effet de traitement reste encore inconnue. Le but de cette étude est de déterminer l’amplitude de l’influence du port des IODs et des CDs sur l’OHRQoL et d’évaluer la stabilité de l’effet de traitement dans le temps, tout en prenant en considération le niveau du SOC. MÉTHODOLOGIE: Des participants édentés (n=172, âge moyen 71, SD = 4.5) ayant reçu des CDs ou des IODs ont été suivis sur une période de deux ans. L’OHRQoL a été évaluée à l’aide du questionnaire « Oral Health Impact Profile (OHIP -20) » et ce avant le traitement et à chacun des deux suivis. Le SOC a été évalué à l’aide du questionnaire « The Orientation to Life (SOC -13) » à chacun des deux suivis. Des analyses statistiques ont été effectuées pour évaluer les différences intra et entre groupes (analyses statistiques descriptives, bivariées et multivariées). RÉSULTATS: Une amélioration statistiquement significative de l’OHRQoL entre les statuts avant et après traitement a été notée dans les deux groupes (Wilks’s Lambda = 0.473, F (1,151) = 157.31, p < 0.0001). L’amplitude de l’effet du traitement IOD est 1.5 fois plus grande que celle du traitement CD. Ces résultats ont été stables pendant les deux années d’étude et ils n’ont pas été influencés par le SOC. CONCLUSION: Le traitement IOD amène une meilleure OHRQoL à long terme en comparaison avec le traitement CD et ce sans influence du niveau du SOC. Ces résultats sont cliniquement significatifs et confirment la supériorité des IODs sur les CDs.