591 results match your criteria: "School of Life Dentistry at Niigata[Affiliation]"

This in vitro study evaluated the effect of different antiseptics and different concentrations thereof in a model of wound healing using human gingival fibroblasts. The fibroblasts were rinsed with four different antiseptic solutions: sodium hypochlorite (HYP), hydrogen peroxide (HO), chlorhexidine digluconate (CHX), and benzalkonium chloride (BC). The effect on the release of interleukin-6 (IL-6) and transforming growth factor beta 1 (TGF-β1) was investigated using enzyme-linked immunosorbent assays (ELISAs).

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Purpose: The flexor digitorum superficialis muscle (FDS) is considered the most important of the forearm flexors for maintaining elbow valgus stability. However, the relationships between the origin structure of each finger of the FDS and the anterior oblique ligament (AOL) of the ulnar collateral ligament and the common tendon (CT) in the proximal part, and morphological features are unclear. The purpose of this study was to clarify the relationships between the origin structure of each finger of the FDS and the AOL and the CT, as well as to clarify the morphological features of the muscle belly of each finger of the FDS.

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This study aimed to examine bactericidal effects of a new antimicrobial photodynamic therapy (aPDT) on dentin plates infected with Lactobacillus acidophilus (L. acidophilus). First, we measured the amount of reactive oxygen species (ROS) produced when new photosensitizer (PS), acid red (AR), and brilliant blue (BB) were irradiated with a semiconductor laser.

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  • DBBM bone grafts are used in regenerative dentistry, with different forms (granules vs. blocks) potentially affecting cell behavior.
  • A study found DBBM granules had a greater volume and surface area than blocks but that blocks offered better cell viability for osteoblasts and macrophages.
  • Despite this, DBBM granules promoted more osteoblast differentiation and showed regenerative effects, possibly due to their larger size and surface area allowing for better cell penetration.
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Objectives: The aim of this study was to investigate the occurrence of vertical and horizontal root fractures using cone-beam computed tomography (CBCT).

Methods: We reviewed the CBCT images of 51 patients who were examined by CBCT for the diagnosis of root fracture. The occurrences of vertical and horizontal root fractures were investigated concerning the pulpal vitality and the kind of tooth, and analyzed by cross-tabulation.

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Antibacterial activity of blue high-power light-emitting diode-activated flavin mononucleotide against Staphylococcus aureus biofilm on a sandblasted and etched surface.

Photodiagnosis Photodyn Ther

September 2020

Department of Crown & Bridge Prosthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamauracho, Chuo-ku, Niigata-shi, Niigata, 951-8580, Japan; Functional Occlusal Treatment, The Nippon Dental University Graduate School of Life Dentistry at Niigata, 1-8 Hamauracho, Chuo-ku, Niigata-shi, Niigata, 951-8580, Japan. Electronic address:

Background: Because of high affinity to the titanium implant surface, Staphylococcus aureus (S. aureus) has been reported as key microorganism that cause the peri-implantitis, even though it is not the typical periodontal pathogenic bacterial strain. The aim of this study was to evaluate the antibacterial property of the aPDT device, using blue high-power LED light activated flavin mononucleotide, comparing to the previously proven aPDT method using methylene blue and red laser on S.

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Assessment of inflammatory jaw pathologies using bone SPECT/CT maximum standardized uptake value.

Dentomaxillofac Radiol

December 2020

Quantitative Diagnostic Imaging, Field of Oral and Maxillofacial Imaging and Histopathological Diagnostics, Course of Applied Science, The Nippon Dental University Graduate School of Life Dentistry at Niigata, Niigata, Japan.

Objectives: To investigate the assessment of inflammatory jaw pathologies using bone single-photon emission CT-CT (SPECT/CT) maximum standardized uptake value (SUV).

Methods: 44 patients with inflammatory jaw pathologies (7 chronic osteomyelitis, 8 osteoradionecrosis and 29 medication-related osteonecrosis of the jaw (MRONJ)) underwent SPECT/CT at 4 h after injection of Tc hydroxymethylene diphosphonate. The SPECT/CT parameters SUV of the inflammatory jaw pathologies were analyzed.

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Statement Of Problem: Oral dryness leads to problems in the oral cavity and pharynx and problems with dental prostheses. Although some moisturizing agents relieve the symptoms of oral dryness, the influence of the flavor of the moisturizing agent on the symptoms of oral dryness has not been clarified.

Purpose: The purpose of this clinical study was to examine the effectiveness of moisturizing gels with different flavors.

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Characteristics of patients with temporomandibular joint osteoarthrosis on magnetic resonance imaging.

J Med Imaging Radiat Oncol

October 2020

Quantitative Diagnostic Imaging, Field of Oral and Maxillofacial Imaging and Histopathological Diagnostics, Course of Applied Science, The Nippon Dental University Graduate School of Life Dentistry at Niigata, Niigata, Japan.

Introduction: Temporomandibular joint (TMJ) dysfunction is a common condition that is best evaluated with magnetic resonance (MR) imaging. The aim of this study was to investigate the characteristics of the patients with TMJ osteoarthrosis on MR imaging.

Methods: The MR images of 206 TMJs of 103 patients with temporomandibular disorders (TMD) were evaluated retrospectively in this study.

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A strong esthetic demand exists for white-colored rather than metallic-colored dental appliances. Polytetrafluoroethylene (PTFE), which is chemically stable with extremely low friction, is a suitable white-colored coating for dental appliances. In the conventional PTFE coating process, base materials are heated to approximately 400°C, which could change their mechanical properties.

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  • The study investigated the benefits of a new technique (C-PRF) for harvesting platelets and leukocytes from the buffy coat, comparing it to the standard injectable PRF (i-PRF) methods.
  • Significant increases in growth factor release, particularly PDGF-AA, TGF-β1, and EGF, were observed with C-PRF over various time points.
  • Both C-PRF and i-PRF promoted high biocompatibility and fibroblast activity, but C-PRF outperformed i-PRF in fibroblast migration and proliferation.
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Many elderly patients have oral dryness; thus, it is necessary to evaluate the oral moisture in a clinical setting. The aim of this study was to clarify the importance of controlling the measuring pressure of the oral moisture-checking device. The influence of the measuring pressure of the oral moisture-checking device was examined using agar under 10 measuring pressure conditions (Kruskal-Wallis test).

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  • The study aimed to assess the effectiveness of glucose administration in keeping blood sugar levels stable for patients with dietary restrictions before undergoing impacted mandibular third molar extraction under sedation.
  • Fifty-four patients were divided into three groups to evaluate their glucose levels after different glucose interventions: one received a glucose-free solution, another got glucose during the surgery, and the last one received it post-surgery.
  • Results showed that only the postoperative glucose group maintained higher blood sugar levels similar to pre-surgery, suggesting that administering glucose immediately after surgery helps prevent low blood sugar postoperatively.
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  • Platelet-rich fibrin (PRF) can be made using whole blood without added factors and its preparation methods vary, particularly in centrifugation techniques.
  • A study compared two centrifugation systems—fixed-angle and horizontal—for their effects on PRF clot properties, specifically looking at cell separation and localization using advanced imaging techniques.
  • Results showed that horizontal centrifugation produced a more uniform distribution of cells within the PRF clots, while fixed-angle centrifugation led to an uneven distribution, indicating that the choice of centrifugation method significantly impacts PRF quality.
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Relationships between skeletal morphology and patterns of bilateral agenesis of third molars in Japanese orthodontic patients.

Odontology

January 2021

Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Life Dentistry At Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.

The aim of this study was to reveal the correlations between bilateral agenesis of third molars (M3s) and skeletal morphology in Japanese male and female orthodontic patients. Sixty patients (30 males, 30 females), with bilateral agenesis of maxillary M3s and without agenesis of mandibular M3s (group U), and 60 patients (30 males, 30 females), with bilateral agenesis of mandibular M3s and without agenesis of maxillary M3s (group L), were selected as agenesis groups. Additionally, 60 patients (30 males, 30 females) with all four M3s were selected as the control group (group C).

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Marginal and internal fit of three-unit zirconia fixed dental prostheses: Effects of prosthesis design, cement space, and zirconia type.

J Prosthodont Res

October 2020

Functional Occlusal Treatment, Department of Crown and Bridge Prosthodontics, School of Life Dentistry at Niigata, The Nippon Dental University, 1-8, Hamaura-cho, Chuo-ku, Niigata 951-8580, Japan; Department of Crown and Bridge Prosthodontics, The Nippon Dental University School of Life Dentistry Niigata Japan.

Purpose: The purpose of this study was to compare the marginal and internal fit of three-unit fixed dental prostheses (FDPs) fabricated using CAD/CAM with two designs, two cement space (CS), and two zirconia types.

Methods: A master model with two zirconia abutments and a missing tooth was scanned with an intraoral scanner. FDPs were fabricated with two designs (Full contour: FC, Framework: FW), two zirconia types (multi-layer: L, single-layer: W), and two CS values (30 and 45 μm for L and 30 μm for W).

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Size and bridging of the sella turcica in Japanese orthodontic patients with tooth agenesis.

Odontology

October 2020

Department of Oral and Maxillofacial Growth and Development, Orthodontics and Dentofacial Orthopedics, The Nippon Dental University Graduate School of Life Dentistry At Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.

The purpose of this study was to investigate the association between the size and bridging of the sella turcica and tooth agenesis, and whether the likelihood of second premolar agenesis can be predicted from the sella turcica size and bridging in Japanese orthodontic patients. Patients were divided into four groups of 32: groups 1 and 2 consisted of patients with agenesis of the maxillary and mandibular second premolars, respectively; group 3, patients with severe tooth agenesis; and group 4, patients without tooth agenesis. Each group was divided into two subgroups of 16 each based on the patient's age: patients under 14 years of age (groups 1A through 4A, group A) and patients 14 years of age or older (groups 1B through 4B, group B).

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Early detection of oral disease is important to reduce its severity and increase the likelihood of successful treatment. This study aimed to perform a quantitative assessment of the saliva components as a first stage of the research to screen oral homeostasis. Here, saliva secretions collected from children were evaluated, and their constituents were analyzed to investigate the potential correlations between the buffering capacity and a range of salivary factors.

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Computed tomography (CT) and magnetic resonance imaging (MRI) can be useful for the evaluation of palatal lesions, and strain elastography (performed together with intraoral ultrasonography) is a relatively new sonographic imaging modality. This report describes 2 clinical cases in which strain elastography was used to assess palatal tumors in conjunction with intraoral ultrasonography, CT, and MRI. In the first case, diagnosed as a myoepithelioma, the strain was determined to be 0.

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Background/aim: Wearing a mouthguard reduces the risk of sports-related injuries, but the material and thickness of the mouthguard have a substantial impact on its effectiveness and safety. The aim of this study was to establish a thermoforming technique in which the model position is moved just before formation to suppress the reduction in thickness. The aim of this study was to assess the effects of model height and model moving distance on mouthguard thickness.

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Correction to: Use of the Er,Cr:YSGG laser for removing remnant adhesive from the enamel surface in rebonding of orthodontic brackets.

Odontology

July 2020

Orthodontics and Dentofacial Orthopedics, Field of Oral and Maxillofacial Growth and Development, Course of Clinical Science, The Nippon Dental University Graduate School of Life Dentistry at Niigata, 1-8 Hamaura-cho, Chuo-ku, Niigata, 951-8580, Japan.

Article Synopsis
  • * The incorrect version of the figure was published to the public.
  • * This indicates a need for corrections or updates in the published work.
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  • Collagen biomaterials, particularly noncross-linked (ncl_CMs) and cross-linked (cl_CMs), are studied for their impact on macrophages and gingival fibroblasts, focusing on their mechanical stability vs. biocompatibility.
  • The study found that cl_CMs maintained higher cell viability for both macrophages and fibroblasts compared to ncl_CMs, while also promoting an M1 macrophage phenotype characterized by increased pro-inflammatory marker expression.
  • However, the media conditioned by Mφ cultured on either type of CM did not significantly alter the mRNA levels of key growth factors in HGF-1 cells, despite a decrease in cell viability induced by the conditioned medium.
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Background/aims: The appropriate heating temperature for the fabrication of mouthguards using ethylene vinyl acetate sheets is reported to be 80-120°C. However, the measurement side of the heating temperature has not been determined. The aim of this study was to investigate the influence of the measurement side of the heating temperature when fabricating mouthguards.

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Purpose: The purpose of this basic research study was to clarify the morphological characteristics of the posterior oblique fibers (POL) of the ulnar collateral ligament using a large number of specimens.

Methods: This study examined 50 arms from 25 Japanese cadavers. Type classification was performed by focusing on the positional relationship between POL morphology and the joint capsule.

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Effects of heat conduction of implant surface at thermal stimulation on implant placement.

Odontology

July 2020

Functional Occlusal Treatment, Department of Crown and Bridge Prosthodontics, Graduate School of Life Dentistry at Niigata, The Nippon Dental University, Niigata, Japan.

The purpose of this study is to investigate, in vitro, how two different implant placement methods (one and two-stage implant placement) affect implant surface temperature after thermal stimulation. Two titanium screw implants were used and three thermocouples were attached to the implant surface at 0.5 mm (ch1), 5.

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