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At least 1,657 records · Page 92Linked to original sources
PubMed2001

[Hydroxyapatite coating on metal plates using an aerosol jet printing system].

The purpose of the present study was to investigate the properties of the hydroxyapatite (HA) layer formed by an aerosol jet printing system, aimed at application to the field of dentistry. The HA particle was adhered to the metal substrate. The particles of HA were 1 micron or less in size and were packed closely. When the composition of the formed HA layer was compared to that of the raw material powder, oxygen was increased, but Ca was decreased. Moreover, Ca and P were almost evenly distributed in the layer, but oxygen was not. Dynamic hardness of HA coatings was 31.5 +/- 1.1. The peel strength of HA coating was the highest, at 58.7-39.6 MPa, in 10 microns layer thickness. Interface fractures were observed at 10 microns layer thickness, and cohesive fractures were observed for all other layer thicknesses. The wear amount of HA coating by tooth brush abrasion was significantly large at 100 degrees C heating (p < 0.05), compared with at 250 degrees C and 500 degrees C. At any substrate temperatures, the wear amount of stainless steel substrate tended to be smaller than that of titanium substrate.

Aerosols↗
PubMed1976

Fluorosis in black-tailed deer.

Marked dental disfigurement and abnormal tooth wear patterns were observed in black-tailed deer (Odocoileus hemionus columbianus) taken from an area near an industrial fluoride source in northwestern Washington. Fluoride levels in the bones of these deer were from 10 to 35 times higher than levels in the bones of normal animals. These levels are similar to those associated with fluorosis of cattle.

Animals↗
PubMed1975

[Dentinogenesis imperfecta: a structural and ultrastructural study].

Histopathology of dentinogenesis imperfecta shows a haphazard distribution of dentinal tubules as well as changes in their diameters, sometimes narrowed, sometimes widened. These tubules appear as bundles or sheaves. This kind of dentine is often similar to secondary (also called tertiary) dentine, only mantle dentine preserving a normal structure. There is a complete obliteration of the pulp chamber and an almost complete obliteration of the root canal. Through SEM, the tubules appear to be few in number, their diameters are small and their fine ramifications are intricate through all planes. An heterogenous intertubular substance can be seen. Through TEM, collagenous fibers appear to be uncalcified or incompletely calcified, with a haphazard distribution. There are wide differences in the sizes of crystals and numerous spaces appear between crystals and collagen. Differences between the ultrastructure of human dentinogenesis imperfecta and the dentine of some lower vertebrates are clearly pointed out.

Dental Cementum↗
PubMed1976

[Therapeutic possibilities in the changing dentition in generalized developmental disorders of the hard substance, ultrastructurally diagnosed I].

Three 5 to 14-year old patients with generalized developmental disturbances of dental hard substance--clinical diagnosis: dentinogenesis imperfecta--are used as examples of age-specific therapy groups in order to demonstrate the various courses of therapy. Early therapy of permanent teeth consists of treating enamel defects with UV hardening resin of the Nuva system. To evaluate adhesion of dental hard substances to resin, it is proposed to use adhesive matrices.

Adolescent↗
PubMed1999

Efficacy of the nocturnal bite plate in the control of bruxism for 3 to 5 year old children.

Bruxism occurs in nearly 60% of children between 3 and 5 years, with important repercussions to the different components of the stomatognathic system. Nevertheless, there is little information in the literature about this topic. The aim of this study was to compare two groups of children with bruxism. One group was not submitted to treatment, serving as a control. To the other group, nocturnal bite plate was made. Cast models were made for both groups, to evaluate the progression of wear facets, during 8 months. The results are as follows: The 4 children of the control group displayed increased wear facets during the study period. On the other hand, of the 5 children that used nocturnal bite plate, showed no increase of wear facets, even after the removal of the device. From this study, we can conclude that the use of nocturnal bite plate is efficient against bruxism in 3- to 5-year-old children.

Bruxism↗
PubMedDate not supplied

Systemic effects of the occlusal destruction in guinea pigs.

Although there is an increasing amount of information pertaining to the systemic effects of malocclusion, its mechanisms still remain unclear in many ways. This study was conducted to find out the systemic effects of the occlusal destruction in guinea pigs. The animals showed an abnormality in posture and a reversal of the T wave in electrocardiogram (ECG) about 6 days after the grinding of all molar teeth. All the animals died about 7 days after the occlusal destruction. We established the optimal condition of occlusal destruction for the induction of the above symptoms in guinea pigs: at least 6 molars, both side premolar, 1st and 2nd molar of upper jaw, because of the ease for repair. The following results were obtained: 1. The experimental group died about 5 days earlier than the fasting group. 2. The animals could not hold their head positions and dropped the head to the earth. 3. The animals died about 12 hours after the onset of postural abnormality. 4. Ninety percent of the animals with postural abnormalities showed T wave inversion on ECG. 5. None of the above symptoms occurred with bite rising. These results indicate that occlusal destruction affects head position, preventing the animals to hold their head positions and causing the head to drop to the ground. Occlusal destruction may also cause abnormality of the masticatory muscles, which control posture and modulate cardiac function via the trigeminal system. This experimental model is suitable for the analysis of the systemic effects of occlusal destruction.

Animals↗