RESUMO
AIM: This longitudinal study aimed to evaluate the electromyographic activity of the masseter and temporal muscles in adult women who underwent buccal fat removal. MATERIALS AND METHODS: The sample consisted of 20 healthy adult women with no temporomandibular dysfunction and normal occlusion, who were assessed before, 30, and 60 days after the surgery. The electromyographic signal of the masseter and temporal muscles was captured through mandibular tasks including rest, protrusion, right and left laterality, and maximum voluntary contraction with and without parafilm. The results obtained were tabulated and the Shapiro-Wilk normality test was performed, which indicated a normal distribution. Statistical analysis was performed using the repeated measures test (p < 0.05). RESULTS: Significant differences were observed between time periods in maximum voluntary contraction for the left masseter muscle (p = 0.006) and in maximum voluntary contraction with parafilm for the right temporal (p = 0.03) and left temporal (p = 0.03) muscles. CONCLUSION: Bichectomy surgery did not modify the electromyographic activity of the masseter and temporal muscles during the rest task but may have influenced variations in the electromyographic signal during different mandibular tasks after 60 days of surgery, suggesting compensatory adaptations and functional recovery. CLINICAL SIGNIFICANCE: Understanding the impact of buccal fat removal surgery on the stomatognathic system function provides insights into postoperative functional recovery and potential compensatory adaptations, guiding clinical management and rehabilitation strategies for patients undergoing such procedures. How to cite this article: Cardoso AHDLS, Palinkas M, Bettiol NB, et al. Bichectomy Surgery and EMG Masticatory Muscles Function in Adult Women: A Longitudinal Study. J Contemp Dent Pract 2024;25(3):207-212.
Assuntos
Eletromiografia , Músculo Masseter , Músculo Temporal , Humanos , Feminino , Estudos Longitudinais , Adulto , Músculo Temporal/fisiologia , Músculo Masseter/fisiologia , Contração Muscular/fisiologia , Músculos da Mastigação/fisiologia , Adulto JovemRESUMO
BACKGROUND: Allograft fresh-frozen bone (FFB) is an alternative to autogenous bone for oral implantation due to bone quantity availability and lower morbidity for patients. Few specific studies about the use of FFB for reconstructing the posterior mandibular alveolar crest have been conducted. OBJECTIVE: The objective of this study was to evaluate histological, histomorphometrical, and volumetric aspects of FFB allografts used to augment atrophied posterior mandible bone ridges. MATERIALS AND METHODS: Sixteen hemi-mandibles of twelve patients presenting with critical alveolar atrophy were three-dimensionally reconstructed using corticocancellous FFB. Thirty blocks were fixed with titanium screws and covered with particulate bovine bone mineral and collagen membrane. Volumetric data were obtained by cone beam computed tomography analysis after 6 months, implants were inserted, and bone biopsies were harvested and sent for histological and histomorphometric analyses. RESULTS: The blocks were distributed between nine female and three male patients (mean age, 50.9 ± 8.3 years). Thirty implants were installed, and the implant survival rate was 96.66%. Histology demonstrated newly formed vital bone contacting residual acellular allograft bone and connective tissue. The histomorphometric analysis showed 18.9 ± 8.1% newly formed bone and 32.5 ± 14.8% allograft residual bone. Graft absorption was 45% for height and volume, and both measures were significantly different (P < 0.001). CONCLUSION: Fresh-frozen allografts are a viable alternative for reconstructing an atrophied mandible in the posterior region, allowing for new bone formation, installation of implants, and prosthetic loading.
Assuntos
Aumento do Rebordo Alveolar/métodos , Transplante Ósseo/métodos , Mandíbula/cirurgia , Aloenxertos , Animais , Parafusos Ósseos , Bovinos , Colágeno/uso terapêutico , Tomografia Computadorizada de Feixe Cônico , Implantação Dentária Endóssea/métodos , Implantes Dentários , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Minerais/uso terapêutico , Resultado do TratamentoRESUMO
BACKGROUND: Surgical techniques as sinus floor augmentation have made it possible to increase the bone volume of the posterior maxilla so that implant placement may be feasible. A large variety of bone grafting materials have been utilized for sinus floor augmentation. A good alternative is allograft. Fresh frozen bone is harvested from live or cadaveric donors and then immediately frozen and stored at -80 °C. To date, studies about the effect of fresh frozen bone are scarce. OBJECTIVE: Evaluation of new bone formation, following maxillary sinus grafting with autograft vs. fresh frozen allograft. MATERIALS AND METHODS: A split-mouth edentulous design including 15 patients was used. Sinus floor augmentation was carried out using either autogenous bone harvested from the ramus area or fresh frozen bone from allogeneic femoral heads. The choice was determined randomly, using a randomized table. The grafted sinus was left to heal for 6 months. Biopsies were harvested from the lateral wall. The biopsies were used for bone histology and histomorphometric analysis. After collection of the biopsy, dental implants were placed. After a healing period of 6 months, the implants were loaded. RESULTS: Implant survival, histology, and histomorphometry of sinuses grafted with autogenous or fresh frozen bone were similar. The new bone formation took place predominantly around and in-between particles. CONCLUSIONS: The findings of the present study support the use of fresh frozen bone allografts for sinus floor augmentation.
Assuntos
Aloenxertos , Autoenxertos , Transplante Ósseo/métodos , Seio Maxilar/cirurgia , Boca Edêntula/terapia , Levantamento do Assoalho do Seio Maxilar/métodos , Antropometria , Biópsia , Histocitoquímica , Humanos , Masculino , Pessoa de Meia-Idade , Osteogênese , Estudos Prospectivos , Resultado do TratamentoRESUMO
The information concerning the molecular events taking place in onlay bone grafts are still incipient. The objective of the present study is to correlate the effects of perforation of resident bone bed on (1) the timing of onlay autogenous graft revascularization; (2) the maintenance of volume/density of the graft (assessed through tomography); and (3) the occurrence of bone remodeling proteins (using immunohistochemistry technique) delivered in the graft. Thirty-six New Zealand White rabbits were subjected to iliac crest onlay bone grafting on both sides of the mandible. The bone bed was drill-perforated on one side aiming at accelerating revascularization, whereas on the other side it was kept intact. After grafts fixation and flaps suture all animals were submitted to tomography on both mandible sites. Six animals were sacrificed, respectively, at 3, 5, 7, 10, 20 and 60 days after surgery. A second tomography was taken just before sacrifice. Histological slides were prepared from each grafted site for both immunohistochemistry analysis [osteopontin, osteocalcin, type I collagen and vascular endothelial growth factor (VEGF) anti-bodies] and histometric analysis. The values on bone volume measured on tomography showed no statistic significance (P>or=0.05) between perforated and intact sites. Grafts placed on perforated beds showed higher bone density values compared with non-perforated ones at 3 days (PAssuntos
Remodelação Óssea
, Transplante Ósseo/fisiologia
, Mandíbula/cirurgia
, Neovascularização Fisiológica
, Processo Alveolar/irrigação sanguínea
, Animais
, Densidade Óssea
, Colágeno Tipo I/análise
, Ílio/cirurgia
, Imuno-Histoquímica
, Osteocalcina/análise
, Osteopontina/análise
, Coelhos
, Tomografia por Raios X
, Fator A de Crescimento do Endotélio Vascular/análise
RESUMO
OBJECTIVES: Alterations in the commercially pure titanium (cpTi) surface may be undertaken to improve its biological properties. The aim of this study is to investigate the biocompatibility of cpTi submitted to different surface treatments. METHODS: The cpTi surfaces were prepared so that machined and blasted surfaces, either acid etched or not, were compared using rat bone marrow cells cultured to differentiated into osteoblast. For attachment evaluation, cells were cultured for 4 and 24h. Cell morphology was evaluated after 3 days. After 7, 14, and 21 days cell proliferation was evaluated. Total protein content and alkaline phosphatase (ALP) activity were evaluated after 14 and 21 days. For bone-like nodule formation, cells were cultured for 21 days. Data were compared by analysis of variance. RESULTS: Cell attachment, cell morphology, cell proliferation, and ALP activity were not affected by surface treatments. Total protein content was reduced by blasted and acid etched surface. Bone-like nodule formation was significantly reduced by blasted, acid etched, and a combination of both blasted and acid etched surfaces. CONCLUSIONS: Based on these results, it can be suggested that cpTi surfaces that were submitted only to machining treatment favor the final event of osteoblastic differentiation of the rat bone marrow cells, evidenced by increased bone-like nodule formation.