Laser hard tissue interactions: energy transmission through human dental tissue using a holmium:YAG laser

1995 ◽  
Author(s):  
Wei R. Chen ◽  
Raleigh A. Holt ◽  
Robert E. Nordquist
Keyword(s):  
Hard Tissue ◽  
Energy Transmission ◽  
Dental Tissue ◽  
Holmium:Yag Laser ◽  
Tissue Interactions

scholarly journals Clinical and Radiographic Findings and Usefulness of Computed Tomographic Assessment in Two Children with Regional Odontodysplasia

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Junko Matsuyama ◽  
Ray Tanaka ◽  
Futabako Iizawa ◽  
Tomiko Sano ◽  
Shoko Kinoshita-Kawano ◽  
...  
Keyword(s):  
Developmental Disorder ◽  
Hard Tissue ◽  
Connective Tissues ◽  
Dental Tissue ◽  
Attenuation Coefficients ◽  
Tooth Formation ◽  
Radiographic Findings ◽  
Computed Tomographic ◽  
Regional Odontodysplasia ◽  
Ghost Teeth

Regional odontodysplasia is a rare, severe, and nonhereditary developmental disorder in tooth formation and involves epithelial and mesenchymal-derived dental tissue. On radiographs, affected teeth have an abnormal morphology, a hypoplastic crown, and only a faint outline of hard tissue, a condition termed “ghost teeth.” We report clinical and radiographic findings from two children with regional odontodysplasia. Using computed tomography (CT), we calculated attenuation coefficients (i.e., Hounsfield units) for affected teeth and assessed the condition of dental follicles. To measure density, regions of interest were delimited and CT values were calculated. In our two patients, the CT values for enamel were lower in affected teeth than in sound teeth, while CT values for dentin were similar for affected and sound teeth. The average CT value for dental follicles in affected teeth was about 65 to 120, which suggests that dense fibrous connective tissues or hard tissue-like structures might be present in dental follicles. Analysis of CT values may be quite useful in the diagnosis and treatment of regional odontodysplasia.

scholarly journals Synchrotron IR-microspectroscopy-based visualization of molecular and chemical interactions between dental cement, biomimetic composite and native dental tissue

2019 ◽  
pp. 71-78 ◽  
Author(s):  
DL Goloshchapov ◽  
V.M. Kashkarov ◽  
Yu.A. Ippolitov ◽  
I.Yu. Ippolitov ◽  
Jitraporn Vongsvivut ◽  
...  
Keyword(s):  
Calcium Hydroxyapatite ◽  
Human Tooth ◽  
Hard Tissue ◽  
Dental Tissue ◽  
Human Teeth ◽  
Dental Cement ◽  
Biomimetic Material ◽  
Hard Dental Tissue ◽  
Calcium Source ◽  
Ir Microspectroscopy

The low affinity of composite materials for the hard tissue of human teeth poses a challenge to restorative dentists. This study was undertaken to explore molecular and chemical characteristics of the interface between the dental cement, the buffer layer formed from a next generation biomimetic material that mimics the organic mineral composition of human enamel and dentin, and the intact native hard dental tissue. Seven plane-parallel dental slices were analyzed using synchrotron IR microspectroscopy. The obtained absorption spectra of functional molecular groups were organized into cluster maps. This allowed us to identify the intact tissue, the adhesive agent and the biomimetic layer at their interface and to localize and measure concentrations of functional groups involved in the integration of the biomimetic composite into the hard tissue of the human tooth. The proposed biomimetic material is based on nanocrystal carbonate-substituted calcium hydroxyapatite synthesized from a biogenic calcium source and a complex of basic polar amino acids copying the composition of the human tooth and can form a functional bond with hard dental tissue.

Lasers and hard-tissue interactions

2004 ◽  
Author(s):  
Mersini I. Makropoulou ◽  
Eirini I. Papagiakoumou
Keyword(s):  
Hard Tissue ◽  
Tissue Interactions

scholarly journals Role of Dental Hard Tissue in Human Identification

2019 ◽  
Vol 9 (3) ◽  
pp. 130-134
Author(s):  
Niharika Swain ◽  
Shilpa Patel ◽  
Jigna Pathak ◽  
Priyadarshani R Sarkate ◽  
Nikita K Sahu ◽  
...  
Keyword(s):  
Human Identification ◽  
Forensic Odontology ◽  
Forensic Identification ◽  
Hard Tissue ◽  
Dental Tissue ◽  
Critical Determinant ◽  
Dental Hard Tissue ◽  
The Status ◽  
Dental Evidence

ABSTRACT Ethnologic identification is one of the major demanding subjects to facilitate human has been encountered with. The forensic magnitude of the dental tissue has been well predictable since teeth are hardest of all human tissues and they can be conserved undamaged for an extensive episode of instance following fatality. They are constant chemically and they retain their characteristics, which becomes a consistent source for determination of human identification. The study of the dental hard and soft tissue for the rationale of establishing the individuality of a victim is called dental profiling. By using the dental profiling techniques, age, gender, and race of an individual can be determined, as well as the data about their socioeconomic status, personal habits, oral and systemic health, occupation, diet, familial relationship, and psychological characteristics. A dental profile is more detailed and reliable if more than one technique is applied. Each human being possesses a unique dental profile that helps them in identification. Education in the field of forensic odontology and techniques of dental profiling is essential since it contributes significantly to the status of the dental profession in additional associated disciplines as well as in public, and it encourages dentists to view their own achievements from a wider perspective. Through the ages, odontological examinations have been a critical determinant in the search of human identity. This piece of review writing gives an overview of the dental evidence and its use in forensic identification. How to cite this article: Sahu NK, Patel S, Pathak J, et al. Role of Dental Hard Tissue in Human Identification. J Contemp Dent 2019;9(3):130–134.

An ultrastructural study of vegetative incompatibility in plants

1978 ◽  
Vol 36 (2) ◽  
pp. 436-437
Author(s):  
Randy Moore
Keyword(s):  
Ultrastructural Study ◽  
Cell Walls ◽  
Growth And Development ◽  
Solanum Pennellii ◽  
Initial Product ◽  
Basic Aspect ◽  
Tissue Interactions ◽  
Graft Interface ◽  
Antigen Antibody ◽  
Standard Fixation

Cell and tissue interactions are a basic aspect of eukaryotic growth and development. While cell-to-cell interactions involving recognition and incompatibility have been studied extensively in animals, there is no known antigen-antibody reaction in plants and the recognition mechanisms operating in plant grafts have been virtually neglected.An ultrastructural study of the Sedum telephoides/Solanum pennellii graft was undertaken to define possible mechanisms of plant graft incompatibility. Grafts were surgically dissected from greenhouse grown plants at various times over 1-4 weeks and prepared for EM employing variations in the standard fixation and embedding procedure. Stock and scion adhere within 6 days after grafting. Following progressive cell senescence in both Sedum and Solanum, the graft interface appears as a band of 8-11 crushed cells after 2 weeks (Fig. 1, I). Trapped between the buckled cell walls are densely staining cytoplasmic remnants and residual starch grains, an initial product of wound reactions in plants.

Effects of Hypophysectomy on the Occurrence and Calcifiability of Matrix Vesicles in the Epiphyseal Growth Plate of Immature Rats

1980 ◽  
Vol 38 ◽  
pp. 578-579
Author(s):  
S. I. Coleman ◽  
W. J. Dougherty
Keyword(s):  
Growth Plate ◽  
Matrix Vesicles ◽  
Epiphyseal Growth Plate ◽  
Hard Tissue ◽  
Hormonal Factors ◽  
Post Surgery ◽  
Mineral Deposition ◽  
Thin Sectioning ◽  
Integral Role ◽  
Cellular Secretion

In the cellular secretion theory of mineral deposition, extracellular matrix vesicles are believed to play an integral role in hard tissue mineralization (1). Membrane limited matrix vesicles arise from the plasma membrane of epiphyseal chondrocytes and tooth odontoblasts by a budding process (2, 3). Nutritional and hormonal factors have been postulated to play essential roles in mineral deposition and apparently have a direct effect on matrix vesicles of calcifying cartilage as concluded by Anderson and Sajdera (4). Immature (75-85 gm) Long-Evans hooded rats were hypophysectomized by the parapharyngeal approach and maintained fourteen (14) days post-surgery. At this time, the animals were anesthetized and perfusion fixed in cacodylate buffered 2.5% glutaraldehyde. The proximal tibias were quickly dissected out and split sagittally. One half was used for light microscopy (LM) and the other for electron microscopy (EM). The halves used for EM were cut into blocks approximately 1×3 mm. The tissue blocks were prepared for ultra-thin sectioning and transmission EM. The tissue was oriented so as to section through the epiphyseal growth plate from the zone of proliferating cartilage on down through the hypertrophic zone and into the initial trabecular bone. Sections were studied stained (double heavy metal) and unstained.

Phononic-Crystal Acoustic Lens by Design for Energy-Transmission Devices

2012 ◽  
Vol 132 (5) ◽  
pp. 686-690
Author(s):  
Yusuke Kanno ◽  
Kenji Tsuruta ◽  
Kazuhiro Fujimori ◽  
Hideki Fukano ◽  
Shigeji Nogi
Keyword(s):  
Phononic Crystal ◽  
Energy Transmission ◽  
Acoustic Lens
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