1,720,988 research outputs found
Enterococcus faecalis leakage of root canal sealers: an ex vivo study
No full textThe aim of this ex vivo study was to evaluate bacterial penetration after filling root canals using 3 different techniques. Three experimental groups of 25 teeth each, obturated with lateral-warm-vertical condensation of gutta-percha, Microseal technique and EndoREZ (R) system, respectively, were tested in a split chamber model system using Enterococcus faecalis and monitored for 180 days to determine bacterial penetration. A statistical analysis was performed using the Kaplan-Meier method. Median survival time was 25 days for Microseal system, 41 for lateral-warm-vertical condensation and 81 for EndoREZ (R). Significant differences were demonstrated between Microseal and EndoREZ (R) (p<0.001) and between Microseal and lateral-warm-vertical condensation technique (p<0.05). No statistically significant differences were observed between EndoREZ (R) and lateral-warm-vertical condensation. After 180 days of assessment, 20% of the EndoREZ (R) samples resisted bacterial penetration and furthermore, the EndoREZ (R) system has the potential to be a filler system compatible with other currently used systems.Univ G dAnnunzio, Sch Dent, Dept Med Oral & Biotechnol Sci, Chieti, ItalyUniv G dAnnunzio, Dept Biomed Sci, Sch Dent, Chieti, ItalyUNESP, Araraquara Dent Sch, Dept Restorat Dent, Aqaraquara São Paulo, BrazilUNESP, Araraquara Dent Sch, Dept Restorat Dent, Aqaraquara São Paulo, Brazi
Anticardiolipin Antibodies In Children and Adolescents With Insulin-dependent Diabetes-mellitus
No full textVEGF and MVD expression in sinus augmentation with autologous bone and several graft materials
Full text linkThe aim of this study was to assess vascular endothelial growth factor (VEGF) expression and microvessel density (MVD) in maxillary sinus augmentation with autogenous bone and different graft materials for evaluating their angiogenic potential.Biopsies were harvested 10 months after sinus augmentation with a combination of autogenous bone and different graft materials: hydroxyapatite (HA, n = 6 patients), demineralized freeze-dried bone allograft (DFDBA, n = 5 patients), calcium phosphate (CP, n = 5 patients), Ricinus communis polymer (n = 5 patients) and control group - autogenous bone only (n = 13 patients).In all the samples, higher intensities of VEGF expression were prevalent in the newly formed bone, while lower intensities of VEGF expression were predominant in the areas of mature bone. The highest intensity of VEGF expression in the newly formed bone was expressed by HA (P < 0.001) and CP in relation to control (P < 0.01) groups. The lowest intensities of VEGF expression in newly formed bone were shown by DFDBA and polymer groups (P < 0.05). When comparing the different grafting materials, higher MVD were found in the newly formed bone around control, HA and CP (P < 0.001).Various graft materials could be successfully used for sinus floor augmentation; however, the interactions between bone formation and angiogenesis remain to be fully characterized.State Univ São Paulo, UNESP, Dent Sch Araraquara, Dept Periodontol, Araraquara, SP, BrazilUniv G dAnnunzio, Sch Dent, Dept Pathol, Peacara, ItalyUniv G dAnnunzio, Sch Dent, Dept Oral Pathol & Med, Peacara, ItalyUniv Guarulhos, Dent Res Div, Dept Periodontol, Guarulhos, SP, BrazilState Univ São Paulo, UNESP, Dent Sch Araraquara, Dept Periodontol, Araraquara, SP, Brazi
Surface and Biomechanical Study of Titanium Implants Modified by Laser With and Without Hydroxyapatite Coating, in Rabbits
No full textSurface and biomechanical analysis of titanium implant surfaces modified by laser beam with and without hydroxyapatite. Titanium implants with 3 different surfaces were inserted into the tibias of 30 rabbits: group I (GI) machined surface (control group), group II irradiated with laser (GII), and group III irradiated with laser and hydroxyapatite coating applied-biomimetic method (GIII). Topographical analysis with scanning electron microscopy was made before surgery in the tibia. These rabbits were distributed into 2 periods of observation: 4 and 8 weeks postsurgery, after which biomechanical analysis (removal torque) was conducted. Statistical analysis used the Student-Newman-Keuls method. Surface showed roughness in GII and GIII. Biomechanical analysis demonstrated values with significant differences in GII and GIII. Titanium implants modified by laser irradiation can increase osseointegration during the initial phase.Universidade Federal de Mato Grosso do Sul (UFMS), UFMS, Campo Grande, BrazilUNESP, Biomat Grp, Inst Chem, Araraquara, BrazilUniversidade Federal de Mato Grosso do Sul (UFMS), Dept Surg Clin, Campo Grande, BrazilUniversidade Federal de Mato Grosso do Sul (UFMS), Dept Vet, Campo Grande, BrazilSão Paulo State Univ, UNESP, Dent Sch Aracatuba, São Paulo, BrazilUNESP, Integrated Clin FOA, Aracatuba, BrazilUNESP, Dept Surg, Aracatuba, BrazilUniv G dAnnunzio, UNICH, Dept Appl Sci Oral & Dent Dis, Chieti, ItalySão Paulo State Univ UNESP, Sch Dent Araraquara, Dept Diag & Surg, Araraquara, BrazilUNESP, Biomat Grp, Inst Chem, Araraquara, BrazilSão Paulo State Univ, UNESP, Dent Sch Aracatuba, São Paulo, BrazilUNESP, Integrated Clin FOA, Aracatuba, BrazilUNESP, Dept Surg, Aracatuba, BrazilSão Paulo State Univ UNESP, Sch Dent Araraquara, Dept Diag & Surg, Araraquara, Brazi
Clinical and radiographic changes around dental implants inserted in different levels in relation to the crestal bone, under different restoration protocols, in the dog model
No full textBackground: The aim of the present study was to evaluate clinical and radiographic changes that occur around dental implants inserted in different levels in relation to crestal bone under different restoration protocols.Methods: Thirty-six implants were inserted in the edentulous mandible of six mongrel dogs. Each implant was assigned to an experimental group according to the distance from the top of the implant to the crestal bone: Bone Level (at crestal bone level), Minus 1 (1 mm below crestal bone), or Minus 2 (2 mm below crestal bone). Each hemimandible was submitted to a restoration protocol: conventional (prosthesis was installed 120 days after implant placement, including 30 days with healing cap) or immediate (prosthesis was installed 24 hours after implant placement). Fixed partial prostheses were installed bilaterally in the same day. After 90 days, clinical and radiographic parameters were evaluated.Results: As long as the implants were inserted in more apical positions, the first bone-to-implant contact (fBIC) was positioned more apically (P0.05). In addition, in immediately restored sites, the PSTM was located significantly more coronally than that in conventionally restored sites (P=0.02).Conclusions: Despite the more apical positioning of the fBIC, the height of the peri-implant soft tissues and ridge was not jeopardized. Moreover, the immediate restoration protocol was beneficial to the maintenance of the PSTM. Further studies are suggested to evaluate the significance of these results in longer healing periods.São Paulo State Univ, Sch Dent Araraquara, Dept Periodontol, BR-14801093 Araraquara, SP, BrazilEduc Fdn Barretos, Sch Dent, Barretos, SP, BrazilIntegrated Fac Santa Fe Sul, Sch Dent, Santa Fe do Sul, SP, BrazilUniv G dAnnunzio, Sch Dent, Chieti, ItalySão Paulo State Univ, Sch Dent Araraquara, Dept Periodontol, BR-14801093 Araraquara, SP, Brazi
Biologic width changes around loaded implants inserted in different levels in relation to crestal bone: histometric evaluation in canine mandible
No full textObjectives: The aim of the present study was to evaluate histometric changes around dental implants inserted at different levels in relation to the crestal bone, under different loading conditions.Material and methods: Thirty-six implants were inserted in the edentulous mandible of six mongrel dogs. Each implant was assigned to an experimental group according to the distance from the top of the implant to the crestal bone: Bone Level (at the crestal bone level), Minus 1 (1 mm below the crestal bone) or Minus 2 group (2 mm below the crestal bone). Each hemimandible was submitted to a loading protocol: conventional or immediate restoration. After 90 days, the animals were killed. Specimens were processed, and measurements were performed concerning the length of soft and hard peri-implant tissues. Data were analyzed using ANOVA and Student's t test (alpha=5%).Results: Among conventionally restored sites, the distance from the most coronal position of soft tissue margin (PSTM) and first bone-implant contact (fBIC) was greater for Minus 2 than for Bone Level and Minus 1 sites (P=0.03), but significant differences were not observed among immediately restored sites. Differences among groups were not observed concerning the PSTM, and the distance from the implant-abutment junction to fBIC. Greater amounts of lateral bone loss were observed for conventionally than for immediately restored sites (P=0.006).Conclusions: These findings suggest that the apical positioning of the top of the implant may not jeopardize the position of soft peri-implant tissues, and that immediate restoration can be beneficial to minimize lateral bone loss. Further studies are suggested to evaluate the clinical significance of these results in longer healing periods.São Paulo State Univ, Fac Odontol Araraquara, Disciplina Periodontia, UNESP,Sch Dent Araraquara, BR-14801093 Araraquara, SP, BrazilFEB, Sch Dent, Barretos, SP, BrazilFUNEC, Integrated Fac Santa Fe do Sul, Sch Dent, Sante Fe do Sul, SP, BrazilUniv G dAnnunzio, UNICH, Sch Dent, Dept Oral Hlth Care Sci, Chieti, ItalySão Paulo State Univ, Fac Odontol Araraquara, Disciplina Periodontia, UNESP,Sch Dent Araraquara, BR-14801093 Araraquara, SP, Brazi
Inner freedom and outer conditions of liberty in Jeanne Hersch (1910-2000)
Full text linkPiergiacomo Severini, Università G. dAnnunzio di Chieti-Pescar
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Political Liberty in Jeanne Hersch (1910-2000)
Full text linkPiergiacomo Severini, Università G. dAnnunzio di Chieti-Pescar
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