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Chapter 13 : Clinico-Pathological Healing of Periapical Tissues in Aged Patients by Root Canal Filling using Calcium Hydroxide: Case resentation
Get PDF9784905130062application/pdfTwo root canal filling materials, Calvital and Vitapex (Neo Dental Chemical Products Co., Ltd., Tokyo, Japan), were used to treat six teeth in a 78-year-old man and one tooth in an 82-year-old woman, respectively. Both of these filling materials were paste, consisting chiefly of calcium hydroxide and iodoform. One year later these teeth, along with surrounding alveolar bone, were examined histopathologically following the patients’ deaths. Of the six teeth treated with Calvital, four were instrumented prior to root canal obturation and two were not. The teeth that were instrumented prior to obturation showed good healing, while those that were not showed poor healing. The tooth treated with Vitapex was instrumented prior to obturation and showed good periapical healing and osteoid closure of the apical foramen. This finding suggests that canal instrumentation followed by obturation with Vitapex can allow favorable healing even in aged patients.Editor, Toshiyuki KawakamiLanguage Editor, David M Carlsonviii, 232 p. ill. (some col.)boo
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Get PDF9784905130062application/pdfEditor, Toshiyuki KawakamiLanguage Editor, David M Carlsonviii, 232 p. ill. (some col.)boo
Chapter 10 : Histopathological Evaluation of Root Canal Filling Material Pastes: An Animal Study
Get PDF9784905130062application/pdfTo improve the paste used for root canal filling, the authors performed a histopathological study on 100 root canals from dogs of more than twelve months of age. The pulps were exposed under general anesthesia with the administration of pentobarbital sodium. The pulp chambers were left opened for one month and then enlargement and cleaning of the root canals were performed. The subjects were divided into three experimental groups: (A) 40 cases of root canals filled with a prepared paste called Vitapex, which contains calcium hydroxide, iodoform, silicone oil, and other substances (B) 30 cases of root canals filled with a paste called Calvital, a mixture of a powder containing calcium hydroxide, iodoform, guanofracin, and sulfathiazole, with a liquid containing propyleneglycol, distilled water and T-cain (C) 30 cases of unfilled root canals Only the pulp chambers were filled with cement bases and amalgam for all cases. After three months, the dogs were sacrificed and specimens were prepared for pathological examination. Radiographic examination was also carried out. The results are as follows. In most of the cases with root canal fillings containing Vitapex and Calvital, regeneration of alveolar bone and apical hard tissue as well as cicatrization of the periodontal membrane and the deep alveolar area were observed. Sealing of the perforated portion of the apex was observed less often. These two pastes proved to be clinically useful, whereas in cases in which no root canal filling was made, reparative process in the tissue of any kind was rarely observed. In many cases of Vitapex fillings and in some cases of Calvital fillings, regeneration of the alveolar bone was irregular and porous. Filling with either of the two pastes decreased the inflammation in the apical area. Three months after the experiment, radiopacity persisted in the group of cases in which Vitapex was used, while this persistence was less notable in cases filled with Calvital.Editor, Toshiyuki KawakamiLanguage Editor, David M Carlsonviii, 232 p. ill. (some col.)boo
Chapter 12 : Histopathological Examination of a 'Simultaneously folded' Method with Paste and Combined Root Canal illing Methods in Dog Teeth
Get PDF9784905130062application/pdfTo improve the method of root canal filling, the authors performed a histopathological study using a novel system named the ‘simultaneously folded’ root canal filling method. This system calls for applying Vitapex paste near the area of the apical foramen followed by filling the remainder of the root canal by means of either the combination of gutta-percha point and KEZ endodontic cement (dry components: 40% zinc oxide, 20% calcium hydroxide, 20% iodoform and 20% rosin; liquid components: 90.5% eugenol 90.5%, 9.0% rosin and 0.5% setting agent) or Neodyne zinc-oxide eugenol cement. The authors compared the healing effects of this method with those resulting from a combined root canal filling method employing gutta-percha point and Neodyne endodontic cement. The root canals of 119 dog teeth were perforated by means of rotary cutting instruments. Pulp chambers were exposed and allowed to remain open for thirty days. Engine reamers were used to perforate the apical portions. They were cleaned with sodium hypochlorite and saline solutions. Fifty-one of the canals were filled using our ‘simultaneously folded’ technique with Vitapex, gutta-percha point and KEZ endodontic cement. Forty-two canals were filled using the 'simultaneously folded' technique with Vitapex, gutta-percha point and Neodyne. Twenty-six canals were filled using a combined root canal filling method with gutta-percha point and Neodyne. Three months later, the dogs were sacrificed and specimens were prepared for histopathological observation. Results showed that the ‘simultaneously folded’ root canal filling method resulted in a peculiar healing process featuring a cement barrier without ankylosis. Apparently, this method accelerated the closure of the apical foramen and regeneration of alveolar bone. Consequently, the 'simultaneous folded' root canal filling method is recommended for clinical application.Editor, Toshiyuki KawakamiLanguage Editor, David M Carlsonviii, 232 p. ill. (some col.)boo
松本歯科大学病院歯科麻酔科における精神鎮静法症例の検討
Get PDFapplication/pdfWe analyzed the dental patients treated with psychosedation in the Department of Dental Anesthesiology, Matsumoto Dental University Hospital over the past 14−year period on the clinical records and anesthesia records. Of a total of 2802 patients, 2285 were treated on an outpatient basis and 517 were hospitalized for treatment. As for age distribution, the age group of 20−29 years old was the most dominant, while gender distribution was 46% males and 54% females. Psychosedation was performed most often for ‘minimizing stress related to systemic illness’ (n=992), followed by ‘fear of highly−invasive dental treatment.’ When divided by the type of sedative therapy, treatment was given as intravenous sedation in 2035 patients, nitrous oxide inhalation sedation in 740 and combined (intravenous−inhalation) sedation in 27. The agents used for intravenous sedation were midazolam in 887 and flunitrazepam in 856 patients. The clinical departments where sedation was given to patients varied, though the Department of Oral Surgery was predominant with 73% of the patients (n=2055). We also found that the number of psychosedation cases were showing an increasing trend, as the number of patients in 2011 was approximately 4 times greater than in 1998. As reasons for that increase, we consider that psychosedation has become more well known by both clinicians and patients, and that the prevalence is increasing along with the aging of society in Japan. As for the type of sedation, the ratio of intravenous sedation cases was high, which is likely because a sedative effect can be reliably obtained with a greater level of sedation than nitrous oxide inhalation sedation. At our institution, a predominant num- ber of sedation cases were treated in the Department of Oral Surgery, with tooth extraction the most common procedure requiring a sedative. We speculated that this department performs highly invasive treatments, such as tooth extraction, as compared to others and that high−risk patients with systemic illness were often referred by practitioners in other departments.journal articl
Collapse and Reconstruction of the Monetary System in Soviet Russia
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片側性唇顎口蓋裂患者の咬合力と正面顎顔面形態の関連性について
Get PDFapplication/pdfThe purpose of this study was to evaluate the relationship between frontal craniofacial pattern and occlusal function in the unilateral cleft lip and palate patients before bone grafting. The relationship between frontal facial morphology and bite force was investigated by the handy type bite force meter and postero−anterior cephalograms. The relationships between the ratio in bite force of the cleft and the non−cleft sides and the ratios in the maxillary and mandibular bone widths, heights and angulations of the cleft and the non− cleft sides, and the mandibular deviation were analyzed. １．The maximum bite force of the cleft side was significantly smaller than that of the non−cleft side. ２．The mandibular lateral deviation showed statistically significant correlations to the ratios of the mandibular bone width, and the maxillary, the occlusal, and the mandibular frontal plane angles. ３．The ratios of the maximum bite force between the cleft and the non−cleft sides showed statistically significant correlations to the ratio of the maxillary bone width between the cleft and the non−cleft sides. These results suggested that the difference of bite force between the cleft and the non− cleft sides related the difference of frontal craniofacial morphology in the unilateral cleft lip and palate patients before bone grafting.journal articl