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  • 1
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy of supraalveolar periodontal healing of auto- and allotransplanted teeth in monkeys (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 6 (1990), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract An ultrastructural study of the supra-alveolar periodontal healing of auto- and allotransplanted teeth was performed in 4 immunologically unmatched green Vervet monkeys. Eight mature incisors were either auto- or allotransplanted. Non-transplanted adjacent incisors served as controls. Prior to transplantation the teeth were endodontically treated extraorally. Eight weeks after transplantation, biopsies including part of the tooth and the adjacent supra-alveolar tissues were taken, fixed, decalcified and processed for electron microscopy. A thin electron dense layer covered the root surface of the autotransplanted teeth. Most collagen fibres inserted into this electron-dense border, as well as into the underlying cementum. A similar relationship between the fibres and root surface was found in controls. On the allotransplanted teeth a layer of electron-dense granular material covered the root surface in the supra-alveolar area. Collagen fibres inserting into the electron-dense border were frequently observed. Fibroblasts were the predominant cell type in the connective tissue adjacent to all transplanted teeth. In autotransplants 2 morphotypes of fibroblasts were observed: 1) cells with dilated endoplasmic reticulum and swollen mitochondria; and 2) cells with normal characteristics of protein synthesis and secretion. The fibroblasts of the allografts were predominantly cells with dilated endoplasmic reticulum and swollen mitochondria. The results indicated some similarities in the healing between the root surface and connective tissue in the supra-alveolar portion of the roots of auto- and allotransplanted teeth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1990.tb00383.x
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  • 2
    Electronic Resource
    Electronic Resource
    Long-term calcium hydroxide as a root canal dressing may increase risk of root fracture (2002)
    Oxford, UK : Blackwell Science, Ltd
    Dental traumatology 18 (2002), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract – It has been proposed (Cvek 1992) that immature teeth are weakened by filling of the root canals with calcium hydroxide dressing and gutta-percha. The aim of the present study was to test the hypothesis that dentin in contact with calcium hydroxide would show a reduction in fracture strength after a certain period of time. Immature mandibular incisors from sheep were extracted and divided into two experimental groups. Group 1: the pulps were extirpated via the apical foramen. The root canals were then filled with calcium hydroxide (Calasept®) and sealed with IRM® cement, and the teeth were then stored in saline at room temperature for 0.5, 1, 2, 3, 6, 9, or 12 months. Group 2: the pulps were extirpated and the root canals were filled with saline and sealed with IRM® cement. The teeth were then stored in saline for 2 months. Intact teeth served as controls and were tested immediately after extraction. All teeth were tested for fracture strength in an Instron testing machine at the indicated observation periods. The results showed a markedly decrease in fracture strength with increasing storage time for group 1 (calcium hydroxide dressing). The results indicate that the fracture strength of calcium hydroxide-filled immature teeth will be halved in about a year due to the root filling. The finding may explain the frequent reported fractures of immature teeth filled with calcium hydroxide for extended periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-9657.2002.00097.x
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  • 3
    Electronic Resource
    Electronic Resource
    Letter to the Editor (2005)
    Oxford, UK : Munksgaard International Publishers
    Dental traumatology 21 (2005), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.2005.00405.x
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  • 4
    Electronic Resource
    Electronic Resource
    Evaluation of statistics and desirable experimental design of a histomorphometrical method for studies of root resorption (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 3 (1987), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract This study characterizes how the accuracy and precision of estimates of the true extent of root resorption are influenced when measuring serial-sectioned individual teeth; different types of teeth with different degrees of resorption, sampling different numbers of sections and registration points. Maxillary and mandibular central and lateral incisors can be used for studies of root resorption with this method. Eight points of registration were required for every section when smaller differences in the means of root resorption between experimental groups were expected. When comparing groups with extensive differences, 4 points of registration were enough. The points should be labial, lingual, mesial and distal. Ten to 17 sections per tooth seemed to be sufficient in most instances. The number of experimental animals needed depended on the statistical procedures and expected outcome of the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1987.tb00637.x
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  • 5
    Electronic Resource
    Electronic Resource
    Fractured teeth bonded with dentin adhesives with and without unfilled resin (2002)
    Oxford, UK : Munksgaard International Publishers
    Dental traumatology 18 (2002), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Fractured incisors were restored by reattaching the fragment to the remaining tooth structure. For this purpose, seven dentin adhesive systems were used with and without an unfilled resin (Heliobond®) and the strength of the restored teeth was tested at a cross-head speed of either 1 or 500 mm/min. The hypothesis was that the strength of the reattachment would be higher when an unfilled resin was used. The dentin adhesive systems were Prime & Bond NT® (PB), Exite® (EX), One-Step® (OS), PQ1® (PQ), SingleBond® (SB), Optibond Solo Plus® (OS), and an experimental adhesive (GL). Statistical analysis revealed that with all adhesives except EX, a significantly greater mean fracture strength was achieved when the adhesives were used with the resin (Heliobond). Furthermore, with all adhesives except PB, there was a significantly lower mean fracture strength when tested at 500 mm/min than at 1 mm/min. All the tested adhesives except EX should be used with an unfilled resin when restoring fractured teeth by reattachment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-9657.2002.180203.x
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  • 6
    Electronic Resource
    Electronic Resource
    Healing and prognosis of teeth with intra-alveolar fractures involving the cervical part of the root (2002)
    Oxford, UK : Munksgaard International Publishers
    Dental traumatology 18 (2002), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Healing and long-term prognosis of 94 cervical root fractures were evaluated. The teeth were divided into two groups according to type of fracture: transverse fractures limited to the cervical third of the root (51 incisors) and oblique fractures involving both the cervical and middle parts of the root (43 incisors). Neither the frequency nor the type of fracture healing differed significantly between the two groups. In the material as a whole, healing of the fracture with hard tissue formation was observed in 17 teeth (18%), and healing with interposition of periodontal ligament (PDL) and, in some cases, hard tissue between the fragments in 62 teeth (66%). Fifteen teeth (16%) showed no healing and a radiolucency adjacent to the fracture. Statistical analyses revealed that incomplete root formation and a positive sensibility test at the time of injury were significantly related to both healing and hard tissue repair. The same applied to concussion or subluxation compared with dislocation of coronal fragment, as well as optimal compared with suboptimal reposition of displaced coronal fragments. The type and duration of splinting (or no splinting) appeared to be of no significance for frequency or type of healing of cervical root fractures. During the observation time (mean = 75 months), 19 (44%) of the teeth with transverse fractures and 3 (8%) of those with oblique fractures were lost after healing. In conclusion, fractures in the cervical part of the root had a healing potential and the predictive parameters identified for fractures in other parts of the root seemed to be valid for the healing of cervical root fractures. Transverse fractures appeared to have a significantly poorer long-term prognosis compared to oblique fractures, apparently due to a marked post-treatment mobility, which often led to new luxation caused by even minor impacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-9657.2002.180202.x
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of saline storage before replantation upon dry damage of the periodontal ligament (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 2 (1986), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The effect of 30 min of saline storage before replantation of teeth, which had been dried out for 30 min, was studied in 10 Green Vervet monkeys (Cercopithecus aethiops). Maxillary central incisors were extracted and dried out for 30 min, after which 1 incisor was replanted and the other transferred to a saline solution for 30 min before replantation. No splinting or endodontic treatment was carried out. The teeth were examined after 8 wk. Histometric analysis showed identical extent of root resorption in the 2 groups, with ankylosis being the dominant resorption type, and with very limited pulpal repair in either group. It is concluded that saline storage under the experimental conditions chosen had no effect on development of root resorption or pulpal repair, presumably because 30 min dry storage had inflicted close to maximal damage on the periodontal ligament at the root surface. On the other hand, it is of clinical importance that a certain delay in the replantation procedure does not influence periodontal and pulpal healing, as long as the tooth is kept in saline storage. This suggests that replantation under these conditions can be reserved for dental professionals, rather than favoring immediate replantation by anyone ‘on-the-spot’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1986.tb00128.x
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  • 8
    Electronic Resource
    Electronic Resource
    Third International Conference on Dental Trauma (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 8 (1992), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1992.tb00231.x
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  • 9
    Electronic Resource
    Electronic Resource
    Supra-alveolar periodontal healing of auto- and allotransplanted teeth in monkeys (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 5 (1989), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Although intra-alveolar healing of allotransplanted teeth often shows pathological changes due to rejection of the tooth graft, previous clinical findings seem to indicate that the supra-alveolar part of the allografts heals differently, which is of significant prognostic value. The aim of the present study was to determine the healing of the cervical part of the periodontium of auto- and allotransplanted mature teeth in monkeys. In 4 adult, immunologically unmatched, green vervet monkeys 16 mature permanent maxillary and mandibular incisors were extracted, endodontically treated and either auto- or allotransplanted; 8 untreated neighbouring incisors served as controls. Block biopsies including part of the tooth and the adjacent vestibular tissues were obtained after a healing period of 8 weeks. The biopsies were decalcified in EDTA and embedded in Epon. In semi-thin sections (1.5 μm) the morphology of the supra-alveolar periodontal tissues was analysed in the light microscope. The orientation of the connective tissue fibres close to the root surface was found to be more parallel to the root surface of allotransplants compared with autografts, while in the control teeth the fibres were generally oriented perpendicular to the root surface. Resorption of the root was seldom found in the supra-alveolar portions of any of the transplanted teeth. The junctional epithelium had migrated slightly apically onto the root surfaces of allotransplanted teeth. The gingival connective tissue adjacent to allotransplanted teeth showed a significantly increased number of lymphocytes compared with autografts and controls. Gingival healing of allotransplanted teeth only differed slightly concerning the orientation of inserting fibres, the number of lymphocytes surrounding the graft and the position of the junctional epithelium, compared with autografts and control teeth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1989.tb00366.x
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