Ozone therapy effect in medication-related osteonecrosis of the jaw as prevention or treatment: microtomographic, confocal laser microscopy and histomorphometric analysis.

OBJECTIVE: This study aimed to evaluate the efficacy of ozone therapy in the preoperative (prevention) and/or postoperative (treatment) of MRONJ. MATERIAL AND METHODS: Forty male Wistar rats were caudally treated with zoledronic acid (ZOL) and to ozone therapy before extraction (prevention, POG), after extraction (treatment, TOG), or both (prevention and treatment, TPOG), and treated with saline (SAL). The animals received intramuscular fluorochrome (calcein and alizarin), and 28 days postoperatively, they were euthanized, and the tissues were subjected to microtomographic computed tomography (microCT), LASER confocal, and histomorphometric analyses. RESULTS: Micro-CT showed a higher bone volume fraction average in all groups than that in the ZOL group (P < 0.001), the ZOL group showed high porosity (P = 0.03), and trabecular separation was greater in the TOG group than in the POG group (P < 0.05). The mineral apposition rate of the POG group was high (20.46 ± 6.31) (P < 0.001), followed by the TOG group (20.32 ± 7.4). The TOG group presented the highest mean newly formed bone area (68.322 ± 25.296) compared with the ZOL group (P < 0.05), followed by the SAL group (66.039 ± 28.379) and ZOL groups (60.856 ± 28.425). CONCLUSIONS: Ozone therapy modulated alveolar bone repair in animals treated with ZOL, mainly after surgery trauma, leading to bone formation as healing tissue. CLINICAL RELEVANCE: Osteonecrosis has been a challenge in dentistry, and owing to the lack of a consensus regarding therapy, studies presenting new therapies are important, and ozone has been one of the therapies explored empirically.

Preclinical in vitro study of streptococcus mutans accumulation in three fixed retainer designs: Microbiological assay.

The use of fixed retainers in the lower arch is frequent; however, its presence increases the accumulation of biofilm and dental calculus. The objective of this research was to evaluate, in vitro, the accumulation of Streptococcus mutans (S. mutans) in 3 designs of fixed retainers. Nine models were reproduced in heat-cured acrylic resin and divided into groups: straight retainer (SR), retainer with vertical strap (RVS), retainer with horizontal strap (RHS). The accumulation of S. mutans was assessed using the MTT assay (3-4,5-dimethyl-thiazol-2-yl-2,5-diphenyltetrazolium bromide) and then measured using an automated reader. The RHS group showed less biofilm accumulation compared to the other groups (p<0.05). The distance between the tooth surface and the retainer showed a strong negative correlation with biofilm accumulation (rs=-0.79, p=0.00037). The RHS showed significantly less accumulation of S. mutans due to the distance between the retainer and the tooth surface. This research provides relevant data for a future randomized clinical trial.

[At the forefront of the temporomandibular dysfunction: a study of experiences]. / Nas trincheiras da disfunção temporomandibular: estudo de vivências.

How does one address an ailment related to such unique experiences without dissociating it from relationships, living conditions and society? Temporomandibular Disorder (TMD) is one of a group of chronic disorders that are difficult to diagnose and provide treatment. As in other similar ailments, such difficulties may accentuate a negative impact on health. The study seeks to identify experiences of health service users with TMD, aiming to contribute to reflection and management practices for the issue. A qualitative otobiographical study was developed, using interviews with people undergoing TMD treatment. Based on the Nietzschean premise that the process of subjectivation is fed by experiences, the method seeks to identify traces of these experiences through the texts resulting from the interviews. Patients' experiences were grouped into five categories: recognition; frustrations; concealment; sadness, fear and death; and destinies. A variety of negative effects have been described in the first three stages, whereas the last one, namely destinies, elicits feelings of well-being. The value of the interactive (professional-user) space, which expresses itself as the power to create innovative and sensitive ways of dealing with health-disease processes, needs to be highlighted.

Como abordar uma doença que traz vivências tão singulares e fazê-lo sem dissociações com as relações, as condições de vida e sociedade? A Disfunção temporomandibular (DTM) é um grupo de desordens crônicas difíceis de diagnosticar e prover tratamento. Como em outras doenças similares, tais dificuldades podem agravar o impacto negativo sobre a saúde. O estudo busca identificar vivências de usuários de serviços de saúde com DTM, visando contribuir com as práticas de reflexão e manejo para a questão. Foi desenvolvido um estudo qualitativo, de caráter otobiográfico, a partir de entrevistas com pessoas em tratamento de DTM. Parte-se da premissa nietzschiana de que o processo de subjetivação é alimentado por vivências; portanto, o método busca a identificação de traços dessas vivências nos textos produzidos a partir da transcrição das entrevistas. As vivências dos pacientes foram agrupadas em cinco trincheiras: nomeação; frustrações; escondido; tristeza, medo e morte; e destinos. Uma variedade de efeitos negativos foi descrita através dos três primeiros estágios, enquanto em destinos, emergem as sensações de bem-estar. Destaca-se o valor do espaço profissional-usuário, que expressa a potência de criação de modos inovadores e sensíveis de lidar com os processos de saúde-doença.

Nas trincheiras da disfunção temporomandibular: estudo de vivências / At the forefront of the temporomandibular dysfunction: a study of experiences

Resumo Como abordar uma doença que traz vivências tão singulares e fazê-lo sem dissociações com as relações, as condições de vida e sociedade? A Disfunção temporomandibular (DTM) é um grupo de desordens crônicas difíceis de diagnosticar e prover tratamento. Como em outras doenças similares, tais dificuldades podem agravar o impacto negativo sobre a saúde. O estudo busca identificar vivências de usuários de serviços de saúde com DTM, visando contribuir com as práticas de reflexão e manejo para a questão. Foi desenvolvido um estudo qualitativo, de caráter otobiográfico, a partir de entrevistas com pessoas em tratamento de DTM. Parte-se da premissa nietzschiana de que o processo de subjetivação é alimentado por vivências; portanto, o método busca a identificação de traços dessas vivências nos textos produzidos a partir da transcrição das entrevistas. As vivências dos pacientes foram agrupadas em cinco trincheiras: nomeação; frustrações; escondido; tristeza, medo e morte; e destinos. Uma variedade de efeitos negativos foi descrita através dos três primeiros estágios, enquanto em destinos, emergem as sensações de bem-estar. Destaca-se o valor do espaço profissional-usuário, que expressa a potência de criação de modos inovadores e sensíveis de lidar com os processos de saúde-doença.

Abstract How does one address an ailment related to such unique experiences without dissociating it from relationships, living conditions and society? Temporomandibular Disorder (TMD) is one of a group of chronic disorders that are difficult to diagnose and provide treatment. As in other similar ailments, such difficulties may accentuate a negative impact on health. The study seeks to identify experiences of health service users with TMD, aiming to contribute to reflection and management practices for the issue. A qualitative otobiographical study was developed, using interviews with people undergoing TMD treatment. Based on the Nietzschean premise that the process of subjectivation is fed by experiences, the method seeks to identify traces of these experiences through the texts resulting from the interviews. Patients' experiences were grouped into five categories: recognition; frustrations; concealment; sadness, fear and death; and destinies. A variety of negative effects have been described in the first three stages, whereas the last one, namely destinies, elicits feelings of well-being. The value of the interactive (professional-user) space, which expresses itself as the power to create innovative and sensitive ways of dealing with health-disease processes, needs to be highlighted.

Early bony changes associated with bisphosphonate-related osteonecrosis of the jaws in rats: A longitudinal in vivo study.

OBJECTIVE: To evaluate early bony changes in an animal model of Medication-Related Osteonecrosis of the Jaw (MRONJ) at the side of the local trauma and at the contralateral side, comparing with a control group. Bony changes were evaluated by Microcomputed Tomography (MicroCT) at three times points: at baseline (T0), after drug administration (T1) and after dental extraction (T2). DESIGN: Two groups were compared: the experimental group in which zoledronic acid (ZA) was administered (17 rats) and the control group (13 rats). Dental extractions of the lower left first molars were performed in all animals. The left side was considered as the supposed affected area in the ZA group, and the right side was considered as the unaffected area. In these areas, the following structural microtomographic bone parameters were calculated: Bone Mineral Density (BMD), Trabecular Thickness (Tb.Th), and Bone Volume Proportion (BV/TV). The comparison of quantitative bone parameters among the different sides and experimental phases of both studied groups were performed by ANOVA-factorial. RESULTS: None of the animals of the control group developed MRONJ. In the ZA group, 76% presented bone exposure. From T0 to T1, Tb.Th and BV/TV increased, and in T2, the mean values were higher in ZA group than in the control group. BMD increased throughout the different phases of both groups. CONCLUSIONS: Structural bony changes occurred in the ZA group at both mandibular sides before the dental extraction (T1). Tb.Th and BV/TV should be further investigated as potential early bone markers of MRONJ.

Study of the kinematic variables of unilateral and habitual mastication of healthy individuals. / Estudo das variáveis cinemáticas da mastigação unilateral e habitual de indivíduos saudáveis.

PURPOSE: To describe and compare the temporal-spatial kinematic variables of mandibular movement during deliberate unilateral and habitual mastication in healthy young-adult individuals. METHODS: The study sample was composed of eight male healthy volunteers aged 19 to 24 years. The kinematic data were obtained using a motion analysis system - Qualisys Track Manager (QTM) ProReflex MCU. Recordings were performed during deliberate unilateral mastication (UM) and habitual mastication (HM) of firm-consistency gummy candy. The following variables were analyzed: (1) masticatory sequence: duration, number of masticatory cycles, and chewing rate; (2) masticatory cycle: duration, vertical and medial-lateral mandibular range of motion in relation to the skull, and maximum velocity during the opening and closing phases. Data of the variables were compared during UM and HM by the paired t test, and the effect sizes ('d' Cohen) were calculated. RESULTS: Regarding the variables of the masticatory sequence, smaller chewing rate was observed for UM compared with that for HM (1.19±0.21Hz and 1.29±0.16Hz, respectively, p=0.004, d=0.53). Smaller values of maximum velocity during the opening (MU=67.4 mm/s and MH=80.02, p=0.053, d=0.80) and closing (MU=71.77±9.35mm/s and MH=3.51±7mm/s, p=0.014, d=0.79) phases of the masticatory cycle were observed in deliberate unilateral mastication compared with those in habitual mastication. CONCLUSION: Kinematic variables associated with the sequence and cycle of mastication are influenced by the chewing pattern adopted - deliberate unilateral or habitual.

In vitro evaluation of wound healing and antimicrobial potential of ozone therapy.

Although ozone therapy is extensively applied when wound repair and antimicrobial effect are necessary, little is known about cellular mechanisms regarding this process. Thus, this study aimed to evaluate ozone cytotoxicity in fibroblasts (L929) and keratinocytes (HaCaT) cell lines, its effects on cell migration and its antimicrobial activity. Cells were treated with ozonated phosphate-buffered saline (8, 4, 2, 1, 0.5 and 0.25 µg/mL ozone), chlorhexidine 0.2% or buffered-solution, and cell viability was determined through MTT assay. The effect of ozone on cell migration was evaluated through scratch wound healing and transwell migration assays. The minimum inhibitory concentrations for Candida albicans and Staphylococcus aureus were determined. Ozone showed no cytotoxicity for the cell lines, while chlorhexidine markedly reduced cell viability. Although no significant difference between control and ozone-treated cells was observed in the scratch assay, a considerable increase in fibroblasts migration was noticed on cells treated with 8 µg/mL ozonated solution. Ozone alone did not inhibit growth of microorganisms; however, its association with chlorhexidine resulted in antimicrobial activity. This study confirms the wound healing and antimicrobial potential of ozone therapy and presents the need for studies to elucidate the molecular mechanisms through which it exerts such biological effects.

Estudo das variáveis cinemáticas da mastigação unilateral e habitual de indivíduos saudáveis / Study of the kinematic variables of unilateral and habitual mastication of healthy individuals

RESUMO Objetivo Descrever e comparar as variáveis cinemáticas temporoespaciais do movimento mandibular durante a mastigação unilateral deliberada e habitual de indivíduos saudáveis. Método Participaram do estudo 8 voluntários saudáveis, do gênero masculino, com faixa etária entre 19 e 24 anos. Os dados cinemáticos foram obtidos através do sistema de análise de movimento Qualysis (QTM - Qualisys Track Manager). Foram realizados registros de mastigação unilateral direita (MU) e habitual (MH) de bala de goma de gelatina de consistência firme. Foram analisadas variáveis relacionadas à (1) sequência mastigatória (duração, número de ciclos e frequência mastigatória); (2) ciclo mastigatório: duração do ciclo mastigatório, amplitude de movimento mandibular vertical e médio-lateral durante o ciclo mastigatório, velocidade máxima durante as fases de abertura e fechamento. A comparação das variáveis durante a MU e MH foi realizada por meio do teste t pareado (p<0,05) e os tamanhos de efeito (‘d’ de Cohen) foram calculados. Resultados Em relação à sequência mastigatória, observou-se menor frequência mastigatória durante MU comparada à MH (1,19±0,21 e 1,29±0,16Hz, respectivamente, p=0,004, d=0,53) e menores velocidades máximas de abertura (MU=67,4 mm/s e MH=80,02; p=0,053; d=0,80) e fechamento (MU=71,77±9,35mm/s e MH=83,51±17 mm/s, p=0,014, d=0,79) do ciclo mastigatório. Conclusão As variáveis cinemáticas relacionadas à sequência e ao ciclo mastigatório foram influenciadas pelo padrão mastigatório adotado – unilateral ou habitual.

ABSTRACT Purpose To describe and compare the temporal-spatial kinematic variables of mandibular movement during deliberate unilateral and habitual mastication in healthy young-adult individuals. Methods The study sample was composed of eight male healthy volunteers aged 19 to 24 years. The kinematic data were obtained using a motion analysis system - Qualisys Track Manager (QTM) ProReflex MCU. Recordings were performed during deliberate unilateral mastication (UM) and habitual mastication (HM) of firm-consistency gummy candy. The following variables were analyzed: (1) masticatory sequence: duration, number of masticatory cycles, and chewing rate; (2) masticatory cycle: duration, vertical and medial-lateral mandibular range of motion in relation to the skull, and maximum velocity during the opening and closing phases. Data of the variables were compared during UM and HM by the paired t test, and the effect sizes ('d' Cohen) were calculated. Results Regarding the variables of the masticatory sequence, smaller chewing rate was observed for UM compared with that for HM (1.19±0.21Hz and 1.29±0.16Hz, respectively, p=0.004, d=0.53). Smaller values of maximum velocity during the opening (MU=67.4 mm/s and MH=80.02, p=0.053, d=0.80) and closing (MU=71.77±9.35mm/s and MH=3.51±7mm/s, p=0.014, d=0.79) phases of the masticatory cycle were observed in deliberate unilateral mastication compared with those in habitual mastication. Conclusion Kinematic variables associated with the sequence and cycle of mastication are influenced by the chewing pattern adopted - deliberate unilateral or habitual.

Experimentally induced masseter-pain changes masseter but not sternocleidomastoid muscle-related activity during mastication.

The aim of this study was to verify the effects of induced masseter-muscle pain on the amplitude of muscle activation, symmetry and coactivation of jaw- and neck-muscles during mastication. Twenty-eight male volunteers, mean age±SD 20.6±2.0years, participated in this study. Surface electromyography of the masseter and sternocleidomastoid (SCM) muscles was performed bilaterally during mastication of a gummy candy before and after injections of monosodium glutamate solution and isotonic saline solution. As a result, we observed a decrease in the amplitude of activation of the masseter muscle on the working side (p=0.009; d=0.34) and a reduction in the asymmetry between the working and the balancing side during mastication (p=0.007; d=0.38). No changes were observed either on the craniocervical electromyographic variables. In conclusion, experimentally induced pain reduced the masseter muscle activation on the working side, thereby reducing the physiological masseters' recruitment asymmetry between the two sides during mastication. No effects on SCM activity were detected. These results may partly explain the initial maladaptative changes underlying TMD conditions.

In situ carcinoma developed over oral lichen planus: a case report with analysis of BUB3, p16, p53, Ki67 and SOX4 expression.

Oral lichen planus (OLP) represents a common mucocutaneous disease. Various authors have suggested that OLP has malignant potential; however, the mechanisms involved in malignant transformation have not yet been elucidated. A 79-year-old man presented a white lesion for five months in the buccal mucosa diagnosed as OLP. After two months using 0.05% clobetasol ointment for treatment, the lesion became ulcerated. A new biopsy of the same lesion was performed, and histological analysis showed an in situ oral carcinoma (ISOC). An immunohistochemistry panel was performed, and p16 expression was negative in OLP, however, it showed weak cytoplasmic staining in ISOC. There was strong nuclear BUB3 staining in both OLP and ISOC areas. p53 showed less intense nuclear staining in both regions. Ki67 was negative in OLP area, but showed nuclear staining in the ISOC. SOX4 was negative in both studied areas. BUB3 expression, first reported in this case, and the p16 expression may suggest some influence of these genes on pathogenesis or malignant potential of OLP.

In situ carcinoma developed over oral lichen planus: a case report with analysis of BUB3, p16, p53, Ki67 and SOX4 expression

AbstractOral lichen planus (OLP) represents a common mucocutaneous disease. Various authors have suggested that OLP has malignant potential; however, the mechanisms involved in malignant transformation have not yet been elucidated. A 79-year-old man presented a white lesion for five months in the buccal mucosa diagnosed as OLP. After two months using 0.05% clobetasol ointment for treatment, the lesion became ulcerated. A new biopsy of the same lesion was performed, and histological analysis showed an in situ oral carcinoma (ISOC). An immunohistochemistry panel was performed, and p16 expression was negative in OLP, however, it showed weak cytoplasmic staining in ISOC. There was strong nuclear BUB3 staining in both OLP and ISOC areas. p53 showed less intense nuclear staining in both regions. Ki67 was negative in OLP area, but showed nuclear staining in the ISOC. SOX4 was negative in both studied areas. BUB3 expression, first reported in this case, and the p16 expression may suggest some influence of these genes on pathogenesis or malignant potential of OLP.

Dental autotransplant: case report

Introduction : The autogenous transplantation or dental autotransplantation is defined as the replacement of an absent or impaired tooth by another transplanted one, usually the third molar. The tooth is transplanted to a prepared or existing tooth socket occupied by the lost tooth, in a same person. This technique is considered a viable method due to its high success rate when properly indicated combined with a relatively low cost.Objective and case report:To report a clinical case study conducted in the Integrated Clinics of the Catholic University of Brasilia in a young melanoderm male patient, 13 years-old, who underwent late tooth transplantation technique, i.e., in two steps: the right upper third molar was transplanted to the socket of the right lower first molar. The case described showed incomplete root formation and radiographic following-up for eight consecutive months. Conclusion:This type of oral rehabilitation contributed to bone formation stimulation at the transplanted site, the maintenance of the masticatory function and the financial costs reduction for the patient, representing a further possible therapy in the dentist's armamentarium.

Efeitos antibacterianos de um novo medicamento - o óleo ozonizado - comparados às pastas de hidróxido de cálcio / Antibacterial effects of a new medicament - the ozonized oil - compared to calcium hydroxide pastes

O objetivo deste trabalho foi avaliar a atividade antibacteriana do óleo ozonizado e do hidróxido de cálcio, associado ao paramonoclorefenol canforado (PMCC)/glicerina ou ao tricresol formalina/glicerina contra bactérias, comumente envolvidas na etiopatogenia das doenças perirradiculares. A metodologia empregada foi o teste de difusäo em ágar. A maior eficácia de atividade antibacteriana foi observada para o óleo ozonizado

Açäo da Arnica Montana 6 CH, no edema, abertura bucal e dor, em pacientes submetidos à extraçäo de terceiros molares inferiores inclusos: avaliaçäo clínica / Arnica Montana 6 CH action, in edema, oral and pain opening, in submited patients to extraction of third molar length included: clinical evaluation

O presente trabalho teve por finalidade realizar avaliaçäo clínica sobre o efeito do medicamento homeopático Arnica montana 6CH, administrado três dias antes da exodontia de terceiros molares inferiores retidos, sobre o edema, abertura bucal e dor. Foi estudo cruzado, randomizado, duplo-cego e placebo controlado, realizado em pacientes portadores de terceiros molares inferiores retidos, bilateralmente simétricos. A avaliaçäo do edema foi realizado por Arco Facial modificado, a limitaçäo da abertura bucal, por paquímetro, medindo a distância inter-incisal entre os incisivos superiores e inferiores. Estes dados foram avaliados às 24, 48, 72 2 168 horas pós-operatórias. A dor foi avaliada por: Escala visual analógica, no dia da intervençäo; Consumo de analgésico, no dia da intervençäo e no primeiro dia pós-operatório e, Tempo decorrente entre o término da cirurgia e o consumo do analgésico. 1) O edema facial foi significativamente reduzido pela açäo da Arnica montana 6CH; 2) A limitaçäo de abertura bucal foi menor em todos os períodos considerados; 3) A Arnica montana 6CH näo teve influência sobre a dor pós-operatória

Ação da Arnica Montana 6 CH, no edema, abertura bucal e dor, em pacientes submetidos à extração de terceiros molares inferiores inclusos: avaliação clínica / Arnica Montana 6 CH action, in edema, oral and pain opening, in submited patients to extraction of third molar length included: clinical evaluation

O presente trabalho teve por finalidade realizar avaliação clínica sobre o efeito do medicamento homeopático Arnica montana 6CH, administrado três dias antes da exodontia de terceiros molares inferiores retidos, sobre o edema, abertura bucal e dor. Foi estudo cruzado, randomizado, duplo-cego e placebo controlado, realizado em pacientes portadores de terceiros molares inferiores retidos, bilateralmente simétricos. A avaliação do edema foi realizado por Arco Facial modificado, a limitação da abertura bucal, por paquímetro, medindo a distância inter-incisal entre os incisivos superiores e inferiores. Estes dados foram avaliados às 24, 48, 72 2 168 horas pós-operatórias. A dor foi avaliada por: Escala visual analógica, no dia da intervenção; Consumo de analgésico, no dia da intervenção e no primeiro dia pós-operatório e, Tempo decorrente entre o término da cirurgia e o consumo do analgésico. 1) O edema facial foi significativamente reduzido pela ação da Arnica montana 6CH; 2) A limitação de abertura bucal foi menor em todos os períodos considerados; 3) A Arnica montana 6CH não teve influência sobre a dor pós-operatória (AU)