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Replantation of enzymatically treated teeth in monkeys. Part I.
Chemical alterations in cementum of avulsed teeth may be implied as a causative factor in their eventual resorption when replanted. Root surface decalcification, with subsequent enzymatic deletion of glycoproteins and cross linking of cementum collagen, results in little or no root resorption for up to 3 months after replantation.
Periapical condensing osteitis and endodontic treatment.
Forty-nine roots of thirty-six teeth with the diagnosis of condensing osteitis were followed up by means of radiographs and patient files after endodontic treatment. The mean observation period was 4.3 years. Prior to endodontic treatment the periodontal membrane was widened on thirty-eight roots but on follow-up only on twelve. The periapical condensing osteitis showed total regression on thirty-six of the forty-nine roots. No condensing osteitis showed progress. The results show rebuilding of bone structures to normal appearance after endodontic treatment of periapical condensing osteitis.
Unusual endodontic therapy in deciduous incisors.
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Cementoblastoma involving multiple deciduous teeth.
The first case of a cementoblastoma involving multiple mandibular deciduous incisors is presented. The clinical, radiographic, and histopathologic features of the cementoblastoma are reviewed. The possible etiology for the pain frequently associated with this lesion is discussed.
Scanning electron microscopic investigation of maxillary lateral incisors with a radicular lingual groove.
Fourteen human lateral incisors with a radicular lingual groove were observed under the scanning electron microscope to explore the communications between the groove and the pulp cavity. Observations showed that accessory foramina could be found not only in the groove, but also in the corresponding wall of the pulp cavity and a cross section. A complete lack of closure of the calcified tissues along the groove, allowing for direct connection of the pulp and the periodontium, was not found in these specimens. Therefore, it is suggested that accessory canals are the main way of communication between the pulp and the periodontium of the incisors with a radicular lingual groove. Because the accessory canals could be found either in the crown part or in the root part of the groove, infectious materials may get into the pulp cavity when there are pathologic conditions either through accessory foramina in the crown part or through accessory foramina exposed by localized periodontitis around the groove.
Reactions of rat odontogenic tissues to heat.
Twenty-four Wistar rats were anesthetized and 200 degrees C heat was applied for 4 minutes to each mandibular left first molar. Eight of these rats were then killed at 2, 8, and 14 weeks. The subject and control teeth were radiographed and compared. They were then prepared for histologic evaluation and scored for levels of inflammation in both the pulpal and periradicular tissues. Furcal, interproximal, and apical radiographic changes were found at all three time intervals. These changes involved progressively larger percentages of teeth at 8 and 14 weeks. Histologically, complete necrosis and/or abscess formation were found in the coronal portions of all experimental pulps. With time, inflammatory changes increased in intensity and progressed through the radicular pulps, resulting in necrosis or calcific changes and, finally, inflammatory changes in the periradicular areas. The pathosis created by the application of heat was devoid of microorganisms as evaluated by the Brown and Brenn stain.
Autogenous transplantation of impacted maxillary canines.
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Apical closure of mature molar roots with the use of calcium hydroxide.
Calcium hydroxide may induce apical root closure in affected mature teeth as well as in immature teeth. Once an apical hard tissue barrier is formed, a permanent root canal filling can be safely condensed. Two cases are described in which calcium hydroxide induced apical root closure in mature molar teeth where the apical constriction was lost because of chronic inflammatory process.
In vitro determination and quantification of 30% hydrogen peroxide penetration through dentin and cementum during bleaching.
Bleaching pulpless teeth with 30% hydrogen peroxide was reported to cause external cervical root resorption. It was hypothesized that H2O2 penetrated open dentin tubules to initiate an inflammatory response that could result in root resorption. No direct experimental evidence was provided to support this theory. An in vitro model for determination and quantification of H2O2 penetration during bleaching procedures is suggested. Artificial defects of the cementum covering the cementoenamel junction were performed in 22 extracted human premolars. After 15 minutes of thermocatalytic bleaching, H2O2 could be detected in the medium surrounding all the tested teeth. Cervical root permeability to 30% H2O2 could reach up to 82% of the total amount applied.
Mandibular lesions in Gaucher disease.
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Root resorption associated with impacted maxillary third molar.
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Unusual case of root resorption of permanent incisors.
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Dental manifestations of autoimmune hypoparathyroidism.
The histopathologic changes in three permanent molars from two siblings with autoimmune hypoparathyroidism as part of candida endocrinopathy syndrome are described. These teeth developed after the diagnosis of hypoparathyroidism and while each subject was receiving vitamin D and calcium supplementation. The pathogenesis of the dental changes is unknown, but it is possible that parathormone may directly influence tooth development independent of its role in calcium and phosphorous homeostasis.
Glutaraldehyde preparations and pulpotomy in primary molars.
The study clinically and radiographically evaluated the long-term success rate of pulpotomy treatment in pulp-exposed primary molars. Five clinicians participated in this study and four glutaraldehyde preparations included 2% buffered, 2% unbuffered, 5% buffered, and 5% unbuffered glutaraldehyde solutions were used. There were 201 children, 108 boys and 93 girls, ranging in age from 4 to 7 years with 258 primary molars treated. After 36 months, 150 teeth with complete clinical records and radiographs were available for evaluation. The treatment of 98% of the patients was clinically successful, but when evaluated radiographically the overall success rate was 78.7%. The group treated with 5% buffered glutaraldehyde showed the highest success rate (87.5%) and group treated with the 5% unbuffered solution the lowest (74.1%), but no significant difference was found among the four groups. Canal obliteration was noted in 22 teeth successfully treated. Four of the teeth that were not successfully treated had canal obliteration before other pathoses became evident. The relative high failure rate in this long-term follow-up indicated that clinicians should be cautious before extensively using glutaraldehyde as a pulpotomy agent.
Root resorption of a first molar related to an impacted third molar.
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Radiology of the jaws: diseases involving the teeth.
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