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Cell-based immunotherapy with mesenchymal stem cells cures bisphosphonate-related osteonecrosis of the jaw-like disease in mice.

Patients on high-dose bisphosphonate and immunosuppressive therapy have an increased risk of bisphosphonate-related osteonecrosis of the jaw (BRONJ); despite the disease severity, its pathophysiology remains unknown, and appropriate therapy is not established. Here we have developed a mouse model of BRONJ-like disease that recapitulates major clinical and radiographic manifestations of the human disease, including characteristic features of an open alveolar socket, exposed necrotic bone or sequestra, increased inflammatory infiltrates, osseous sclerosis, and radiopaque alveolar bone. We show t

The Influence of Local Pamidronate Application on Alveolar Dimensional Preservation after Tooth Extraction-An Animal Experimental Study.

The aim of this randomized, controlled animal exploratory trial was to investigate the influence of local application of aminobisphosphonate pamidronate during the socket preservation procedure. Mandibular premolars were extracted in five Göttingen minipigs. Two animals underwent socket preservation using BEGO OSS (n = 8 sockets) and three animals using BEGO OSS + Pamifos (15 mg) (n = 12 sockets). After jaw impression, cast models (baseline, eight weeks postoperative) were digitized using an inLab X5 scanner (Dentsply Sirona) and the generated STL data were superimposed and analyzed with GOM I

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… Figure 4 Representative imaging of the bone structure in polarized light (staining: toluidine blue; magnification: 50×): ( a ) primarily parallel aligned, newly formed bone structure in the former tooth socket; ( b ) the remaining cortical bone shows a typical osteon structure (red arrow); ( c ) border …

The temporal course of mucoperiosteal flap revascularization at guided bone regeneration-treated implant sites: a pilot study.

AIMS: To investigate post-operative capillary density regeneration in healing mucoperiosteal flaps at guided bone regeneration-treated implant sites. MATERIAL AND METHODS: A non-invasive post-operative investigation was performed in 10 patients using orthogonal polarization spectral (OPS) imaging for assessment of capillary density during the course of mucoperiosteal flap wound healing for 6 weeks in patients receiving dental implants. RESULTS: The greatest increase in capillary regeneration occurred in the early wound-healing phase, during weeks 1 and 2, and recovery to baseline was achieve

Application of Autologous Platelet-Rich Plasma on Tooth Extraction Site Prevents Occurence of Medication-Related Osteonecrosis of the Jaws in Rats.

This study evaluated the effects of local application of autologous platelet-rich plasma (PRP) on the tooth extraction site of rats presenting the main risk factors for medication-related osteonecrosis of the jaw (MRONJ). For seven weeks, senile rats were submitted to systemic treatment with vehicle (VEH and VEH-PRP) or 100 μg/Kg of zoledronate (ZOL and ZOL-PRP) every three days. After three weeks, the first lower molar was extracted. VEH-PRP and ZOL-PRP received PRP at the tooth extraction site. Euthanasia was performed at 28 days postoperatively. Clinical, histopathological, histometric and

Are gingival phenotype, residual ridge height, and membrane thickness critical for the perforation of maxillary sinus?

BACKGROUND: Sinus membrane perforation is the most common complication of the sinus-augmentation procedure. Anatomic factors have been implicated in the risk of sinus membrane perforation (SMP) during sinus-lift surgery. However, there are no reports on the relationships among gingival phenotype (GP), residual ridge height (RRH), membrane thickness (MT), and perforation rate of the maxillary sinus. Therefore, the aim of this clinical study is to determine the associations among GP, RRH, MT, and SMP rate. METHODS: Forty-four patients (64 sinus-lift procedures) were included in the study. Preop

Prevention of medication related osteonecrosis of the jaw after dentoalveolar surgery: An institution's experience.

BACKGROUND: Dentoalveolar surgery is a predisposing factor for medication related osteonecrosis of the jaw (MRONJ). The aim of our study was to evaluate the described surgical procedures to prevent the development of MRONJ after dentoalveolar surgery in patients receiving bisphosphonates. MATERIAL AND METHODS: In this retrospective study, sixty-three dentoalveolar surgeries were performed on 44 patients taking bisphosphonate in accordance with the treatment procedures we described. The following procedures were applied to patients 1) use of antibiotics 2) performed dentoalveolar surgical proc

Could Local Application of Hypoxia Inducible Factor 1-α Enhancer Deferoxamine Be Promising for Preventing of Medication-Related Osteonecrosis of the Jaw?

This experimental study investigates the prophylactic effect of deferoxamine (DFO) on medication-related osteonecrosis of the jaw (MRONJ). Thirty-six female Sprague Dawley rats received zoledronic acid (ZA) for eight weeks to create an osteonecrosis model. DFO was locally applied into the extraction sockets with gelatin sponge (GS) carriers to prevent MRONJ. The specimens were histopathologically and histomorphometrically evaluated. Hypoxia-inducible factor 1-alpha (HIF-1α) protein levels in the extraction sockets were quantified. New bone formation rate differed significantly between groups (

Skeletal Site-specific Effects of Zoledronate on in vivo Bone Remodeling and in vitro BMSCs Osteogenic Activity.

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) has been associated with long-term oral or intravenous administration of nitrogen-containing bisphosphonates (BPs). However, the pathogenesis of BRONJ remains unknown, and definitively effective treatment has not yet been established. Bisphosphonate-related osteonecrosis (BRON) tends to occur in maxillofacial bones. Why this occurs is still unclear. Here we show that zoledronate (Zol) treatment suppresses alveolar bone remodeling after tooth typical clinical and radiographic hallmarks of the human BRONJ, whereas enhances peripheral bone q

Eleven myths of dentoalveolar surgery.

Through the years, dentists who perform dentoalveolar surgery have perpetuated many myths and other unproven beliefs from one generation to another. Sometimes, these beliefs originated in older textbooks, while others were given birth by mentors sharing anecdotal experiences with their students. Even today, many of these scientifically unsupported statements are perpetuated in surgical textbooks and in continuing education forums and are passed on to students in dental schools. In today's evolving environment of evidence-based medicine and dentistry, these anecdotal observations do not withsta

Радиологическое и патологическое восприятие остеонекроза, связанного с лекарственными препаратами, у < < Жо > > , больного миеломой: доклад 3 Дела.

Связанный с лекарственными препаратами остеонекроз челюсти (MRONJ) является редким побочным эффектом некоторых лекарственных средств, главным образом тех, которые используются при лечении конкретных раковых заболеваний и при первоначальном лечении ненеопластических заболеваний. Первые случаи остеонекроза челюсти были зарегистрированы в ходе 2 десятилетия назад у пациентов, употребляющих бисфофонаты (БП). После идентификации номенклатура перешла от остеонекроза челюсти (BRONJ) к MRONJ, поскольку другие лекарства могут вызвать такую же реакцию. Инвазивные стоматологические услуги, такие, как экс

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… (B) Axial CBCT image showing multiple, irregular, mixed lytic and sclerotic bone fragments consistent with sequestra formation (blue arrow) at the #43 and #44 tooth sockets and a pathological fracture (blue dashed arrow). … (B) Axial CBCT image showing multiple, irregular, mixed lytic and sclerotic bone fragments consistent with sequestra formation (blue arrow) at the #43 and #44 tooth sockets and a pathological fracture (blue dashed arrow). …

Targeting endoplasmic reticulum stress-induced lymphatic dysfunction for mitigating bisphosphonate-related osteonecrosis.

BACKGROUND: Bisphosphonates (BPs) are the first-line treatment to stop bone resorption in diseases, including osteoporosis, Paget's disease, multiple myeloma and bone metastases of cancer. However, BPs-related osteonecrosis of the jaw (BRONJ), characterized by local inflammation and jawbone necrosis, is a severe intractable complication. The cumulative inflammatory burden often accompanies impaired lymphatic drainage, but its specific impact on BRONJ and the underlying mechanisms remain unclear. METHODS: The mouse BRONJ model was established to assess the integrity and drainage function of ly

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… HE staining showed that ZDPR significantly enhanced tooth socket healing in both conditional knockout models, with reduced necrotic bone and decreased inflammatory cell infiltration in the extraction sites (Figure S6A,B ). …

Evaluation of Preventive Role of Systemically Applied Erythropoietin after Tooth Extraction in a Bisphosphonate-Induced MRONJ Model.

Background and Objectives: In this experimental study, the prophylactic effect of systemically administered erythropoietin (EPO) in medication-related osteonecrosis of the jaw (MRONJ) was evaluated. Materials and Methods: The osteonecrosis model was established using 36 Sprague Dawley rats. EPO was systemically applied before and/or after tooth extraction. Groups were formed based on the application time. All samples were evaluated histologically, histomorphometrically, and immunohistochemically. A statistically significant difference in new bone formation was observed between the groups (p <

Calcium Phosphate Ceramics Can Prevent Bisphosphonate-Related Osteonecrosis of the Jaw.

Bisphosphonate-associated osteonecrosis of the jaw (BRONJ), a post-surgical non-healing wound condition, is one of the most common side effects in patients treated with nitrogen-containing bisphosphonates. Its physiopathology has been related with suppression of bone turnover, of soft tissue healing and infection. Biphasic calcium phosphates (BCP) are used as a drug delivery vehicle and as a bone substitute in surgical wounds. Due to their capacity to adsorb zoledronate, it was hypothesized these compounds might have a protective effect on the soft tissues in BRONJ wounds. To address this hypo

Significance of perineural invasion in locally advanced bucco alveolar complex carcinomas treated with surgery and postoperative radiation ± concurrent chemotherapy.

BACKGROUND: The purpose of this study was to evaluate prognostic factors, locoregional control, and survival in locally advanced bucco-alveolar complex cancers. METHODS: A retrospective review of 83 patients treated between January 2009 and December 2012 with bucco-alveolar complex cancers was conducted. All patients had surgery and adjuvant radiotherapy with intensity-modulated radiotherapy (IMRT) with/without concurrent chemotherapy. Survival analysis was performed using Kaplan-Meier and multivariable Cox regression model. RESULTS: On univariate and multivariate analysis, perineural invasi

Dental extraction following zoledronate, induces osteonecrosis in rat's jaw.

Sarcoptic mange is a parasitic contagious disease that can lead to significant declines in wildlife populations. To identify the most used methods for diagnosing mange in free-ranging wildlife species, a systematic review was conducted across multiple databases: Scopus, PubMed, Web of Science, ProQuest Central and CABI. Citation screening was performed using the web-based platform, Covidence. A customized data extraction form, developed by the authors, was used to collect relevant information. This information was later exported and analyzed using Microsoft Excel. The objectives of this system

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… The grid image comprised of all tooth sockets from the coronal limits adjacent to the gingival epithelium until the lower apical limit. Figure 2 Histological Analysis. …

Alveolar ridge reconstruction with titanium mesh and autogenous particulate bone graft: computed tomography-based evaluations of augmented bone quality and quantity.

PURPOSE: The purpose of this study was to evaluate the quality and quantity of augmented bone following alveolar ridge reconstruction with titanium mesh and autogenous particulate bone graft for implant placement in terms of the preoperative bone defect. MATERIALS AND METHODS: Forty-one patients (50 sites) rehabilitated between September 2000 and May 2009 with autogenous particulate intraoral bone or iliac cancellous bone marrow grafts and micro-titanium meshes were enrolled. We classified the bone defects by means of shape as complex horizontal-vertical (HV), horizontal (H), and socket (S) t

Potential role of the comprehensive tooth extraction procedure in preventing medication related osteonecrosis of the jaw (MRONJ): a prospective cohort study.

BACKGROUND: This article aims to elucidate the potential role of a comprehensive tooth extraction procedure in preventing mdication-related osteonecrosis of the jaw (MRONJ) through a prospective cohort study. By systematically assessing clinical outcomes following this procedure, the study seeks to provide evidence regarding its effectiveness in MRONJ prevention, thereby contributing to improved clinical guidelines and patient care related to dental extractions in at-risk populations. METHODS: Patients using anti-resorptive agents (ARAs) who required extraction of at least one tooth were incl

Как готовить пациентов, получающих антирезортивную терапию, к извлечению зубов: обзор.

Бифосфонаты (БП) и Деносумаб (ДМБ) являются антирепрессивными агентами (АА), обычно используемыми для лечения остеопороза, множественной миеломы (8,0%), рака груди (3,3%), рака простаты (2,9 процента) и других магнелез (0,7 процента), метастаза кости и гиперкальцемии, вызванной раком. Однако эта терапия связана со значительным риском связанного с лекарствами остеонекроза челюсти (MRONJ), особенно после выведения зубов. Цель этого описательного обзора заключалась в обобщении текущих данных о мерах, направленных на снижение риска ДРОНЖ после извлечения зубов, и в критическом обсуждении достоверн

Calcium Phosphate Bone Substitutes in the Prevention of Bisphosphonate-Related Osteonecrosis of the Jaw: A Review.

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) is characterized by exposed necrotic bone that often progresses with increasing pain and impaired quality of life. Zoledronate, the most potent and widely used bisphosphonate, has been strongly associated with BRONJ development following invasive dental procedures. Given the rising incidence of BRONJ, understanding and implementing effective preventive strategies have become imperative. Biomaterials based on synthetic hydroxyapatite and beta-tricalcium phosphate have been investigated as potential preventive agents. Their therapeutic rati

Evaluation of Preventive Treatment Protocols for Patients under Antiresorptive Therapy Undergoing Tooth Extraction at a Swiss University Clinic.

Antiresorptive agent-related osteonecrosis of the jaw (ARONJ) is a dreaded complication in patients with compromised bone metabolism. The purpose of the present study was to examine the occurrence of ARONJ and its related factors among patients with a history of antiresorptive therapy undergoing tooth extraction using preventive protocols at a Swiss university clinic. Data were retrospectively pooled from health records of patients having received a surgical tooth extraction between January 2015 and April 2020 in the Clinic of Cranio-Maxillofacial and Oral surgery, University of Zurich. A tota