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PubMed1990

Vital root resection with advanced periodontitis--case reports.

Furca of multi-rooted teeth are sometimes affected by advanced periodontitis and supporting tissue is almost lost around one of two or two of three roots, while the remaining root or roots are supported by a relatively intact periodontium. In these situations, the procedure of root resection has usually been carried out. Though the necessity of prior or simultaneous endodontic treatment will be considered concomitantly, it is not clear the good periodontal results can be obtained in such cases by these endodontic treatments. If the technique of vital root resection should be indicated to these cases, the vitality of the tooth would be retained and the damage would be minimal. The technique of vital root resection and two periodontally successful clinical cases are presented. This technique appears appropriate in cases in which a multi-rooted tooth is afflicted with a hopeless periodontitis involving one or two roots.

Adult↗
PubMed1990

[Pulpal response to diammine silver fluoride. (2). Application on exposed pulps].

A histopathological study was attempted to investigate the pulpal response to diammine silver fluoride which was applied on the exposed pulps. Cavity preparation was performed on healthy permanent teeth on mongrel dogs with an air water spray in order to expose the pulp tissue on the small area of the cavity floors. In the experimental group (28 teeth), 0.01 ml 38% diammine silver fluoride solution was applied on the cavity floors and the exposed pulps for 3 minutes after cavity preparation. In the control group (27 teeth), nothing was applied on the cavity floors and the exposed pulps. All the cavities of these groups were left open to the oral environment without any restoration. The specimens were processed for histopathological evaluation at 3, 7 and 30 days. The teeth were fixed in 10% neutral buffered formalin, embedded in celloidin, serially sectioned through the pulp and stained with hematoxylin and eosin. The following observations were obtained. 1. After 3 days, both of the 2 groups showed such severe histopathological changes as necrosis, suppurative inflammation, round cell infiltration, bleeding and hyperemia of pulps with high percentages (77.8%-100%). 2. After 7 days, both of the 2 groups showed partial-necrosis, suppurative inflammation, round cell infiltration, bleeding and hyperemia of pulps with high percentages (63.6%-100%). 3. After 30 days, the percentages of suppurative inflammation and round cell infiltration decreased, though the percentages of complete-necrosis of pulps increased in both of the 2 groups. 4. After 30 days, cicatrization of pulps and apposition of dentin on the pulp chamber wall were observed in each of 2 teeth (25%) in the experimental group, and in each of 2 teeth (16.7%) in the control group. 5. In the 2 groups, all of the teeth except one 30-day specimen in the experimental group and one 7-day specimen in the control group, which were histopathologically evaluated as fairly success, were histopathologically evaluated as failure. 6. Application of 38% diammine silver fluoride solution did not show any protective efficacy to exposed dental pulps.

Animals↗
PubMed1990

[Biochemical study on the application of alpha-cyanoacrylate instant adhesives in dentistry].

The author biochemically evaluated the possible application of 4 types of alpha-cyanoacrylate adhesive agents (methyl, ethyl, isopropyl and isobutyl) in dentistry. A semiconductor temperature sensor was used to measure alpha-cyanoacrylate polymerization-temperature maximum heat, and an oscilloscope was employed to measure heat value. Amounts of formaldehyde eluted from the soluble component of alpha-cyanoacrylate was measured colorimetrically. In addition, to evaluate the effects of alpha-cyanoacrylate on pulp tissue, the soluble component of alpha-cyanoacrylate polymer was added to mouse macrophages. Changes in the numbers and morphology of macrophages and their glucose consumption in the supernatant medium were studied and compared with corresponding data obtained when formaldehyde alone was used. (1) During the polymerization of alpha-cyanoacrylate, when a glass fiber disc filter was used, the temperature increased by 19.1 degrees C in 1 microliter with methyl and by 8.6 degrees C with isobutyl. Even with the same alkyl, however, polymerization heat differed depending on the structure and constitution of the adhesive material and varied widely according to experimental conditions. (2) A mean maximum temperature of 1.7 degrees C in the dentin floor during polymerization of 10 microliters of alpha-cyanoacrylate monomer with methyl suggests no thermal injury to the pulp. (3) Formaldehyde was detected in all 4 adhesives when alpha-cyanoacrylate was dropped into distilled water for polymerization. Since, with each alkyl, the amount of eluted formaldehyde reached a maximum after 1 day of immersion, continuous elution of formaldehyde by hydrolysis was negligible. (4) A greater amount of formaldehyde was eluted from the polymer with methyl and ethyl, which have less Cs, than from the polymer with isopropyl and isobutyl, which have more Cs. These findings suggest that alkyl type affects the amount of eluted formaldehyde. (5) The soluble component of the alpha-cyanoacrylate polymer, either methyl or ethyl, had no effect on the number or morphology of mouse macrophages, as compared with corresponding data obtained when sterilized distilled water was used as a control. Isopropyl and isobutyl, however, decreased cell count and inhibited the extension of the sell soma. (6) The effects of isopropyl and isobutyl on the numbers and morphology of macrophages were similar to those of formaldehyde used alone at a concentration of 8 ppm or more. These findings suggest that, under the present experimental conditions, the above-mentioned changes in macrophages are the effects of about 8 ppm of formaldehyde. (7) The rate of glucose consumption by macrophages with methyl or ethyl was as high as that with the control.(ABSTRACT TRUNCATED AT 400 WORDS)

Adhesives↗
PubMed1989

[Properties of dental cyanoacrylate cement "FH" in the early period of setting].

The properties of dental cyanoacrylate cement "FH", which has protective and bacteriostatic effect on dental pulp, were compared with that of glass-ionomer cement. The operational properties such as setting time and consistency were good, but the mechanical properties as dental cement were a little inferior. These properties were affected definitely by temperature and humidity than the glass-ionomer cement, especially the influence of humidity was very high. However, the influence on bond strength was almost nothing, especially in the early period of setting. The factors affecting it could be very low disintegration. The bond strength for dentin after 24 hours the start of mixing of FH cement was much higher than that for enamel, but the strength rapidly decreased by thermal cycling between 4 degrees C and 50 degrees C in water.

Cyanoacrylates↗
PubMed1989

[Clinico-pathological studies on the effects of calcium hydroxide eugenol preparations to the human vital pulp tissues].

The present paper reports results of a study to evaluate clinico-pathologically the effects of calcium hydroxide eugenol preparations on exposed pulp tissues in permanent human teeth. The experiments were performed on 80 vital human teeth from patients ranging in age from 12 to 54 years. The experimental teeth were arbitrarily divided into the following 4 groups. Group CRCS: 20 cases treated with CRCS (Hygienic, Akron, Ohio, USA). Group KEZ: 20 cases treated with Dentalis KEZ (Neo Dental Chemical Products, Tokyo, Japan). Group CE: 20 cases treated with calcium hydroxide eugenol (positive control) Group E: 20 cases treated with pure eugenol (negative control). After local anesthesia, the experimental teeth were isolated with rubber dums or cotton rolls. Following preparation of Black's simple class 1 cavities with a diamond instrument mounted high-speed air turbine, the pulp was intentionally exposed by means of a steel bur mounted electric engine. The cavity and exposed pulp surface were cleaned with saline and dried on absorbent material. Then the experimental materials (agents) were applied to exposed pulp surface. The cavity was lined with gutta-percha temporally stopping, and the remainder was filled with silver amalgam. The teeth were clinically observed at various intervals from immediately to 530 days after treatment and then extracted under local anesthesia and prepared for histopathological study. Decalcified sections were stained with hematoxylin and eosin. 1) CLINICAL OBSERVATIONS: During the observation period, symptoms occurred in the following: Group CRCS: 4 (20%) out of 20 cases. Group KEZ: 4 (20%) out of 20 cases. Group CE: 6 (30%) out of 20 cases. Group E: None of 20 cases No spontaneous pain was observed in these groups. 2) Clinical evaluations Group: CRCS: 16 cases (80%) were good, 3 cases (15%) were satisfactory, and 1 cases (5%) were failure. Group KEZ: 16 cases (80%) were good, 1 cases (5%) were satisfactory, and 3 cases (15%) were failure. Group CE: 14 cases (70%) were good, 4 cases (20%) were satisfactory, and 2 cases (10%) were failure. Group E: 20 cases (100%) were good. 3) Histopathological observations. Various kinds and degree of pulp changes were occurred in each group. Hyperemia and round-cell infiltration resulting from damage caused by treatment and medicaments were frequent in each group. No suppurative inflammation occurred in group CE. Pulp cicatrization and apposition of dentin on pulp chamber walls were observed frequently in each groups. Hard tissue formation was observed in numerous cases of group CE and in some cases in group CRCS and KEZ.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1989

[Relationship between endodontium and periodontium].

In this article the effect of periodontal disease and therapy on the dental pulp is discussed together with a brief description of the development and treatment modalities of hypersensitive teeth. In addition a problem-orientated description is given of the differential diagnosis of perio-endo lesions and the implications of the perio-endo relationship for treatment.

Dental Pulp Capping↗
PubMedDate not supplied

[Comparative morphological characteristics of the pulp reaction to direct coating with therapeutic packings].

In experiments performed on green monkeys the molar pulp response to direct coating with calmecin and polycarboxylate cement saturated with the potassium nitric solution. Compared, the results of morphological pulp investigation showed the polycarboxylate cement with saturated potassium nitrate solution coating to be most effective. It had a rather good odontotropic effect and increased the protective action of the pulp. Polycarboxylate cement with saturated potassium nitrate solution coating is recommended for clinical trials to treat occasional pulp denudation.

Animals↗