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At least 1,495 records · Page 83Linked to original sources
PubMed1994

Preparation of unfixed and undecalcified frozen sections of adult rat periodontal ligament during experimental tooth movement.

The upper first molars of adult male rats were moved for 7 days and unfixed, undecalcified frozen sections of the molar periodontal ligament were prepared and observed. The upper jaws of the rats were immersed rapidly in liquid nitrogen and sectioned with a cryostat using a super hard knife. Five micrometer serial sections were cut, collected, freeze-dried and observed with both light and scanning electron microscopy. Electron probe microanalysis (EPMA) was also performed on the sections. On the tension side of the periodontal ligament, periodontal fibers were stretched and the osteoblasts were aligned on the osteoid, which showed metamasia with the toluidine blue stain. On the pressure side where the periodontal ligament was extremely compressed, tissue degeneration was caused by tooth movement and the osteoclasts were observed on the bone surface adjacent to the degenerating tissues. Scanning electron microscopy revealed a network arrangement of the collagen fiber bundles on the tension side, but not on the pressure side of the periodontal ligament. The spectrum obtained from EPMA of the osteoid demonstrated X-ray (Ka) peaks of Na, P, S, K and Ca.

Animals↗
PubMed1992

[Monitoring of tooth displacement using eddy-current type sensor--concerning orthodontic treatment for patients with cleft lip and palate].

We frequently experienced a relapse tendency after the upper dental arch expansion in a patient with cleft lip and palate. The purpose of this study was to detect the tooth displacement right after removing the orthodontic appliance. Time-lapse monitoring of the displacement was performed on the maxillary canine in the minor segment using a non-contact eddy-current type sensor. Clinical application was tested in 9 patients with clefts, and the following results were obtained: 1) The relationship between the displacement and the output voltage of the sensor showed a good linearity with a +/- 3% standard error. 2) In 3 subjects with oronasal fistula after orthodontic treatment and in a subject with discontinuity of the maxillary dental arch, displacements toward the palatal side were recorded. 3) In 2 subjects with arch continuity in the maxilla, no significant displacement was observed. 4) The viscoelastic property of the surrounding tissue of the tested tooth could have induced the displacement monitored by this method.

Adolescent↗
PubMed1999

[Observations of interproximal contact relationship during function].

Previous studies have shown that molar teeth pulsate at rest and displace linguo-apically during clenching at the intercuspal position. These results suggested that teeth do not contact adjacent teeth and the distance between all adjacent teeth decreases during clenching. This study was conducted to investigate the interproximal contact relationship during clenching by a CCD microscope. Two subjects (Males: Aged 28 years) with normal dentition and occlusion were selected for in vivo observation. The observed contact points had optimum tightness which was defined by the insertion of a 50 microns thick stainless steel strip with some resistance, but not by that of a 110 microns strip. A space existed between the teeth at rest and the CCD microscope positioned on the buccal side could detect light from the lingual side. For dynamic observation, a lingual plate with a light source was fitted to each subject. When the subjects clenched, the light band was divided. Furthermore, a digital tension gauge was used to measure the interproximal force for pulling thin Titanium strips. The interproximal force significantly increased during clenching. In vitro, to estimate the relation between the width of the light band and the interproximal distance, two extracted teeth were used. Light bands were analyzed by computer. The distance between adjacent teeth at rest was 3-21 microns, and interproximal spaces disappeared during clenching. These results suggested that teeth do not contact adjacent teeth at rest but they do during clenching.

Adult↗
PubMed2000

[Influence of occlusal contacts on tooth displacement].

During function, the tooth displacement path depends on occlusal contacts of the upper and lower teeth. Therefore, we must reconstruct occlusal relation carefully so as not to disturb physiological tooth displacement. In this investigation, tooth displacements were measured with the Displacement Transducer type M-3 in varying occlusal contact. The following conclusions were obtained. 1. The location of occlusal contacts influenced the tooth displacement of the upper first molar. Especially, an occlusal contact on the lingual inclination of the lingual cusp, buccal cusp had great influence. The tooth showed displacement toward the buccal direction, and it differed from the physiological tooth displacement path during clenching at the intercuspal position. 2. The location of occlusal contacts had little influence on the tooth displacement of the lower first molar. The tooth showed displacement toward the lingual direction. It was similar to the physiological tooth displacement. 3. On the upper first molar, the location of occlusal force influenced the Stress-Strain curve. Especially, the occlusal force on the buccal cusp had great influence on the amount of tooth displacement. 4. On the lower first molar, the location of occlusal force influenced the Stress-Strain curve. Especially, the occlusal force on the lingual cusp brought much displacement and a 2-phase displacement path, at times. Therefore, occlusal contacts have close relation to tooth displacement, and any occlusal reconstruction should harmonize with tooth displacement representing periodontal tissue distortion.

Adult↗
PubMed2003

[The effect of pontic occlusal form on abutment tooth displacement].

The three-dimensional displacements of abutment teeth in fixed partial dentures (FPDs) during mastication were measured while changing the pontic occlusal design, for comparison against those of natural teeth. The purpose of this study was to clarify the influence of pontic occlusal form on the displacements of the abutment teeth, and to decide the optimum pontic occlusal design. Three subjects, who each had a single missing tooth (upper first molar or second premolar), were chosen. After 3-unit FPDs were cemented, abutment tooth displacement during mastication was measured using a three-dimensional tooth displacement transducer Type M-3. The functional or non-functional cusp inclination of the pontic was changed gradually. The flatter the inclination of the functional cusp of pontic became, the more the abutment teeth displaced in the buccal direction. The flatter the inclination of pontic non-functional cusp became, the less the abutment teeth displaced in the buccal direction, and the more the abutment teeth mostly displaced in the palatal direction. If the inclination of the functional cusp of pontic becomes excessively flatter, or the inclination of pontic non-functional cusps becomes as steep as the natural teeth, non-physiological distortion may occur in periodontal tissues of the abutment teeth.

Adult↗
PubMed2003

[Influence of occlusal contacts of implant on adjacent teeth and antagonists displacements].

This study examined the optimum occlusal contacts of implant prostheses to maintain good oral condition after treatment. Three subjects who had two contiguously missing teeth (first and second molars) were selected. The displacement path of the implant, the adjacent tooth and the antagonistic tooth during clenching were measured using the type M-3 three-dimensional tooth displacement transducer. The occlusal contacts of implant prostheses changed according to the following four conditions. A contact: the inner inclination of the upper buccal cusp, B contact: the inner inclination of the upper lingual cusp, C contact: the outer inclination of the upper lingual cusp, and ABC contact: including the above three contacts. The measurements were performed at least six months after implant surgery. In each subject, the implants and the adjacent teeth were not affected by the change of the occlusal contact of the implant prosthesis, but the opposing teeth were affected. In the case of implantation in the lower side, the opposing tooth displaced in the buccal direction with A contact and C contact, which was a different direction to that of the natural tooth. The antagonist with B contact displaced in the lingual direction, which was the same direction as that of the natural tooth. The antagonist with ABC contact displaced in the lingual or buccal direction. It is concluded that the occlusal adjustment of implants needs much care: in the case of only A contact or C contact, non-physiological distortion might occur in periodontal tissues of the opposing teeth of the implant.

Adult↗
PubMed2004

[Influence of occlusal contacts on tooth displacement for mesio-distal direction].

To fabricate a prosthesis which is functionally harmonized with the stomatognathic system, the interocclusal relationship must be reproduced as accurately as possible. This study investigated the influence of the occlusal contacts upon tooth displacement and clarified the optimal occlusal contacts for the prosthesis. The displacement paths of six maxillary left first molars of six adults in good general health were measured in this study. We gave each test tooth eight patterns of artificial occlusal contacts by attaching platinum foil on the occlusal surface. Subjects were asked to perform clenching at the intercuspal position (= ICP) with medium occlusal forces, and 3-dimensional tooth displacement paths were measured by the Type M-3 tooth displacement transducer. The following conclusions were obtained. 1. Using the Student's t-test for statistical analysis, it was suggested that the difference of the buccolingual location of occlusal contacts influenced the direction of the tooth displacement. 2. The tooth which had occlusal contact in the buccal cusp displaced in the mesio-buccal direction, so this may create a wide dental arch and a slight discrepancy was generated at the distal interproximal contact area of the tooth. 3. It was shown that the tooth which had occlusal contact in the buccal cusp rotated in the buccoapical direction in reverse to the natural tooth.

Adult↗
PubMed2006

[The relationship between three-dimensional occlusal force and tooth displacement depending on clenching force in function].

This study evaluated the relationship between occlusal force and tooth displacement in function. The three-dimensional tooth displacement transducer Type M-3 was used to measure the tooth displacement path and a three-dimensional small occlusal force sensor was developed to detect the occlusal force. Subjects' teeth were the upper and lower first molars. The three-dimensional tooth displacement and occlusal force of the upper and lower first molars were measured at the same time during light and heavy clenching in vivo. The direction of the tooth displacement and that of the occlusal force of the upper first molar almost coincided and they were along the palato-apical direction. However, in the lower first molar, the direction of occlusal force was in the apical direction, and the tooth displacement path was along the lingual direction. There was no relationship between the direction of occlusal force and clenching intensity at the upper and lower first molars and no relationship was observed between the direction of tooth displacement and occlusal force at the lower first molar. However, the upper molars showed a tendency to move more in the palatal direction as the force increased. In the case of the upper first molar, the energy of force seemed to change with the distortion of the alveolar bone especially around the root surface. However, in the case of the lower first molar, the energy of this occlusal force might be absorbed by the deformation of the mandible.

Adult↗
PubMed1999

[The effect of continuous clasps on the state of residual teeth].

170 removable partial dentures connected with continuous clasps (Kennedy bar) of 162 patients have been examined. In the case of 77 dentures the continuous clasps were tooth-supported, whereas in the other 93 cases tooth-supports has not been used. Authors examined the effect of dentures on the periodontal tissues, by measuring the frequency of occurrence of gingivitis, pocket formation, and increased tooth movability. Teeth, touching the tooth-supported clasps suffered from damage of the periodontal tissues in 20.1%. This value increased to 38.4% in the case of clasps without tooth-support.

Dental Clasps↗
PubMed1997

Orthodontic-prosthetic treatment to replace maxillary incisors exfoliated because of improper use of orthodontic elastics: a case report.

This article describes the iatrogenic exfoliation of maxillary central incisors following the improper use of orthodontic elastic bands. The unsecured rubber band had migrated apically and caused an almost "bloodless extraction" of both maxillary central incisors. A combined orthodontic-prosthetic solution was used to replace the lost incisors.

Adolescent↗
PubMed1975

Complications associated with maxillary osteotomies.

There are certain complications involved in maxillary ostetomies; devitalization of teeth, loss of part or all of the osteotomized segment, and relapse are possible problems. The paramount cause of the complications in seven different cases seemed to be the interruption of the blood supply to the operative site. A seven-point guideline is formulated; it integrates preoperative planning, surgical procqedures, and postoperative care.

Adolescent↗