1/8. Investigations on a cell culture medium for storage and transportation of avulsed teeth.Non-physiologic storage of avulsed teeth leads to a high incidence of root resorption, resulting in poor prognosis. This study investigated the suitability of specially composed cell culture media for storage of extracted teeth for up to 48 hours. Autoradiographic investigations revealed that the proliferative activity of periodontal ligament (PDL) cells of teeth stored in cell culture medium for up to 48 hours increased with storage time. Studies on proliferation of PDL cells after storage of teeth in different media for up to 24 hours demonstrated that the proliferative activity is dependent on the composition of the medium. Immunohistochemical investigations with markers for cell proliferation revealed that pulp cells of extracted immature teeth show numerous proliferations after storage for up to 24 hours in a special cell culture medium but few proliferations after storage in Hanks Balanced Salt Solution (HBSS). The investigations indicate that a special cell culture medium can preserve cell viability of PDL cells adhering to extracted teeth for at least 48 hours. The in vitro results are confirmed by a case presented: After storage of two upper central incisors for 36 hours in the cell culture medium the teeth could be successfully reimplanted after extraoral insertion of titanium posts into the root canal (auto-alloplastic reimplantation). Clinical and radiological follow-up examinations for 12 months revealed normal periodontal healing.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
2/8. replantation with intentional rotation of a complete vertically fractured root using adhesive resin cement.This case describes intentional replantation with rotation of a complete vertically fractured root using adhesive resin cement. The fractured root was fixed with adhesive resin cement extra-orally. The tooth was replanted into the socket with rotation in order to avoid contact with the area where the periodontal ligament of the root surface was lost and the area where the alveola bone was lost along the fracture line. At follow-up 18 months later, the tooth was asymptomatic and radiographically showed an increase in the density of the alveolar bone, and the periodontal pockets were improved.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
3/8. Reestablishing biologic width with forced eruption.maintenance of gingival health is one of the keys for the longevity of teeth, as well as for the longevity of restorations. In this context, the biologic width functions as a barrier against the entrance of microorganisms into the internal medium of the periodontal ligament and into the gingival and osseous connective tissue. This clinical case describes a technique to reestablish the biologic width of a central incisor using forced extrusion and done without post-treatment corrective surgery.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
4/8. Potential efficacy of GTR and autogenous bone graft for autotransplantation to recipient sites with osseous defects: evaluation by re-entry procedure.This clinical study aimed to evaluate the effectiveness of guided tissue regeneration (GTR) or autogenous bone graft for autotransplantation to recipient sites with an osseous defect, based on a substantial assessment of bone regeneration using a re-entry procedure. Three cases of autotransplantation of a wisdom tooth to the position of first molar, in which moderate to extensive bone loss at the buccal alveolar plate was observed, were studied. Each tooth was transplanted with no additional treatment, or in conjunction with GTR or autogenous bone graft. Four to 20 months after surgery, a re-entry procedure was performed to visually examine healing. When GTR membrane coverage or bone graft was used, previously absent alveolar bony plates regenerated and the initially exposed roots were covered with newly formed bone, while no bone formation was observed in the case without any additional procedure. These results demonstrate that both GTR and autogenous bone graft are beneficial for obtaining bone regeneration in autotransplantation to defective recipient sites, contributing to retaining space and excluding the contact of gingival connective tissue with periodontal ligaments.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
5/8. Cementodentinal tear: a case report with 7-year follow-up.BACKGROUND: Cemental tears are an uncommon form of root fracture that can lead to rapid localized attachment loss. Typically, the separation of the fragment occurs at the cementodentinal junction. In this report, we present a case of periodontal involvement associated with a cemental tear-like fragment that proved to be a cementodentinal tear. We also review the literature on the clinical presentation of cemental tear associated periodontal lesions. methods: A 52-year-old male presented with acute pain on the maxillary right second premolar. Clinically, probing depth of 7 mm and inflammation were noted on the distal aspect of tooth #4. Radiographic examination revealed separation of cervical root structure on the distal aspect of the tooth, involving two-thirds of the root length. The root fragment was removed, and the localized defect was treated by open flap debridement along with scaling and root planing. The patient was then placed on a regular periodontal maintenance schedule. RESULTS: A postoperative probing depth of 2 mm with 1 mm recession was recorded at 3 months, and maintained for 7 years. Histological examination indicated that the detached root fragment contained dentin with overlying acellular cementum and associated periodontal ligament tissue. The fragment was estimated to represent as much as 20% of the total root surface area. CONCLUSION: Moderate to severe periodontal attachment loss associated with cemental or cementodentinal tears, even ones constituting a significant portion of the root surface, can be successfully treated with conventional periodontal surgical procedures and maintained long term with a proper maintenance regimen.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
6/8. The fate of a mid-root fracture: a case report.The present report describes a case of a mid-root fracture in a maxillary central incisor of a 19-year-old patient. The fractured tooth was splinted with composite that was removed only 3 years later, as the patient did not appear for follow-up examinations. At this time, the radiographs revealed a normal periodontal ligament, rounding of the borders of the fragments and pulp obliteration of both fragments. Eight years later, the tooth was clinically normal and blurred calcification of the root canal was disclosed radiographically. After 13.5 years the patient complained of tooth mobility and radiographic examination revealed an advanced cervical root resorption. As no conservative approach was possible at this stage, the patient was referred to a prosthodontist for esthetic rehabilitation.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
7/8. Orthodontic eruption of furca-involved molars.guided tissue regeneration techniques, which are used in the treatment of certain advanced Class II and Class II furca-involved teeth, have progressed from promising to predictable. However, furca-modification techniques remain important aspects of treatment. tooth eruption, combined with standard furca-modification techniques, improves the prognosis for both the treated and the adjacent teeth. Continued eruption of periodontally involved molars improves the crown-to-root ratio and maintains the periodontium of the adjacent dentition. These same concepts can be used to treat restoratively compromised molars, many of which were considered hopeless and subsequently extracted. Passive eruption can be useful in treating cases that need less than 3 mm of tooth eruption; orthodontic-active eruption with fixed appliances is advised if more than 3 mm of eruption is desired. Slower eruption rates (2 mm per month) allow the periodontal ligament to repair and the alveolar bone to remodel between orthodontic adjustments (3 to 4 weeks between adjustments). Periodic periodontal maintenance is accomplished during orthodontic treatment. After a retention period (8 weeks), periodontal surgery should be performed to reestablish the tooth's biologic width. After surgical wound healing (6 to 8 weeks), the tooth should be restored.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |
8/8. Multidisciplinary approach to the repair of vertically fractured teeth.This case report describes the treatment of a vertically fractured upper left second molar. The two segments were extracted separately. The periodontal ligament was protected from damage extraorally by soaking it with Hanks' balanced salt solution. The two segments were bonded with the use of a biocompatible glass ionomer bone cement and replanted in conjunction with an expanded polytetrafluoroethylene (gore-tex) membrane. After 1 yr the tooth functions normally and is clinically and radiographically within normal limits.- - - - - - - - - - ranking = 1keywords = periodontal ligament, ligament (Clic here for more details about this article) |