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At least 955 records · Page 53Linked to original sources
PubMed1989

[Study on thermal pulp testing of immature permanent teeth].

The duration of reaction to cool stimulation was investigated in 185 normal maxillary right and left central and lateral incisors from 55 pediatric patients aged from 6 to 15 years, who were brought to the Department of Pedodontics of Nippon Dental University Hospital, and from 9 students aged from 19 to 20 years in the School of Dental Technology and Hygiene affiliated with Nippon Dental University by using Dichloro-Difluoro-Methane coolants [PULPER (G-C Dental Industrial Corp.) and PULPOFLUORANE (Septodont Co.)] in order to determine the efficacy of thermal pulp testing for mature and immature permanent teeth. The results obtained are as follows: 1) The mean duration of reaction to cool stimulation according to the type of teeth was 0.93 sec for the maxillary left lateral incisors, 0.91 sec for the maxillary left central incisors, 0.88 sec for the maxillary right central incisors and 0.95 sec for the maxillary right lateral incisors, showing no statistically significant difference in the duration between the tooth types. 2) The duration of reaction to cool stimulation according to age was shortened with aging except for the 6-year-old patients. 3) The patients were divided into those 10 years old or younger and those older than 10 years because the tooth roots of the maxillary anterior teeth are developed at 10 years of age. The mean duration of reaction to cool stimulation was 1.02 sec in the group with immature permanent teeth, which consisted of patients aged 10 years or younger, while it was 0.82 sec in the group with mature permanent teeth, which consisted of patients aged 11 years or older.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1989

[Aspect of proliferous bony ingression into ceramic tube].

Ceramic materials have been clinically utilized as artificial biomaterials in the stomatognathic ffeld today. Among the materials bioinert alumina ceramics was selected in this study to investigate the fundamental aspect of bony ingression into porous ceramics and influence of pore diameter on the ingression. Tubes made of alumina ceramics of respective pore diameters of 200, 300 and 500 microns were embedded in the mandibular bones of rabbits, and the aspect was observed with the passage of time. The osseous area in the tube was measured through image analysis system of contact microradiogram (CMR) of cross sections and the following conclusions were obtained: 1. Bony ingression was observed in all the porous diameter in 2 weeks after the embedding, and increased during the subsequent period up to 6 months. The alumina ceramics used in this study showed high histological affinity. 2. The respective diameters of 200, 300 and 500 microns were suitable for the pore of the alumina ceramic tooth root materials. The embedding period without any burden was estimated to be better for 6 months. 3. The adequate pore diameters of porous alumina ceramics, when used as osseous prosthetic materials, were 200 and 300 microns, because in these cases new bones proliferated well into the tube up to the depth of 5mm.

Animals↗
PubMedDate not supplied

[The use of hydroxylapatite in maxillofacial surgery].

The calcium phosphate system, and in particular Hydroxylapatite, has been the subject of intensive investigation. Recently dense, non-resorbable particulate and block forms of hydroxylapatite have been developed for use as tooth root, bone augmentation and bone replacement material. Dense and porous hydroxylapatite forms have been used clinically for periodontal defects, alveolar ridge maintenance and alveolar ridge deficiencies. In this study the different clinical uses of hydroxylapatite in the Maxillofacial area are presented.

Alveolar Bone Loss↗
PubMed1989

[Jaw and perioral reflexes elicited by tooth tapping in the cat].

The reflex responses elicited by tapping the maxillary canine were studied in 12 adult cats anesthetized with alpha-chloralose. Short (4-8 msec) and long (14-22 msec) latency responses were recorded from both efferent nerves innervating a digastric muscle and an inferior portion of perioral muscles. These two responses were also observed from a single fiber teased from the efferent nerve as two successive groups of spike discharges. The long-latency responses from the digastric and the perioral muscle were both elicited by a light tooth tapping and disappeared at about the same time following infiltration of local anesthetic over the tap-stimulated tooth root or following inhalation of ether narcosis. The long-latency responses from the above muscles may be, therefore, elicited by the same sensory information of the periodontal afferent, and have a common reflex center.

Animals↗
PubMed1978

Maxillary anterior displacement and impaction in the mixed dentition.

Attention has been given to problems of eruption in the maxillary anterior region. It is a region where a variety of anomalies occur. Since the maxillary anterior region influences appearance so greatly, early detection of difficulties and careful planning and treatment can be extremely beneficial to patients.

Child↗
PubMed1989

Dens evaginatus involving a supernumerary (mesiodens) tooth.

The presence of dens evaginatus has not been reported previously in the Indian race. The condition affects the premolars most commonly, and is rarely reported in molars, canines, or incisors. The involvement of a supernumerary (mesiodens) tooth with a traumatic aetiology is a rare finding. The treatment included the extraction of the involved tooth for functional and aesthetic reasons.

Adult↗
PubMed1977

[Possibilities for the use of lasers in dental surgery].

The use of the Nd:YAG laser in everyday oral surgery in patients with a hemorrhagic diathesis is reported. It proved successful in various hemorrhagic disorders mild forms of hemophilia A. The most essential including step forward seems to be that this may simplify the so far complicated treatment of this group of patients in a hospital, as it may enable outpatient therapy to be performed and considerably reduce the cost of treatment. In addition, the risk of hepatitis is smaller for all those patients in whom missing clotting factors have had to be substituted up to the present.

Hemophilia A↗