111,826 research outputs found
Lingual orthodontics and forced eruption: a means for osseous and tissue regeneration
No full textAn hopeless upper central incisor was subjected to forced eruption in order to improve and develop the implant site by distraction of the periodontal ligament-alveolar bone complex. The orthodontic extrusion was carried out with two aesthetic approaches: lingual orthodontics and a composite resin 2-2 veneer pontic. The first part of the extrusion was realized with lingual orthodontics alone, then, when the crown had been remodelled in its greatest part and the aesthetics was no more acceptable to the patient a composite resin 2-2 veneer pontic was bonded to the vestibular side of the other three incisors to mimetise the extruded tooth and to be anchorage to the lingual mechanics. The orthodontic preparation of the implant site allowed the correction of the periodontal defect due to the fracture, the enhancement of the alveolar bone and the soft tissue remodelling
Tensile test and interface retention forces between wires and composites in lingual fixed retainers,Test de d{\'e}collement et de r{\'e}tention des liaisons entre fils et composites dans les contentions linguales fixes
No full textNon specific acid esterase activity in human periapical inflammatory cells
No full textAbstract
The fine structural localization of non specific acid alpha-naphthyl acetate esterase activity (ANAE) in human periapical inflammatory cells was studied in sections of paraffin embedded tissue of 20 human periapical lesions (granulomas). Examination of specimens incubated with ANAE resulted in ANAE+ cells interpreted as T-lymphocytes, monocytes, macrophages, giant cells and plasma cells. ANAE- lymphocytes were interpreted as B cells. Our findings do not seem to confirm the presence among human periapical inflammatory cells of NK (natural killer) cells. T-lymphocytes were the most represented cellular type. The macrophages with ANAE+ reaction were numerous in all specimens observed and the variation in staining intensity could reflect a varying stage of activation. These findings allow conclusions about the role of T-lymphocyte mediated immune reaction in the pathogenesis of periapical lesions. The possibility that the activated T-lymphocytes within the periapical lesions may have a critical role in establishing and maintaining granuloma formation is also discussed
Clinical evaluation of an oval-shaped prefabricated glass fiber post in endodontically treated premolare presenting an oval root canal cross-section: a retrospective cohort study
No full textPURPOSE:
This retrospective cohort study investigated the clinical effectiveness of preformed oval-shaped glass fiber posts in combination with a dual-curing composite resin core material in endodontically treated premolars presenting an oval root canal cross-section and restored with all-ceramic crowns over up to 45 months.
MATERIALS AND METHODS:
The study population comprised 134 patients and 154 endodontically treated premolars, with varying degrees of hard tissue loss, restored by means of oval-shaped fiber-reinforced posts. Inclusion criteria were premolars presenting an oval-shaped root canal, symptom-free endodontic therapy, root canal treatment with a minimum apical seal of 4 mm, application of rubber dam, and the need for a post and core complex because of coronal tooth loss. Four groups were defined based on the number of preserved coronal walls after endodontic treatment and before core buildup. Survival rate of the post and core restorations was determined using Kaplan-Meier analysis, and statistical analysis was performed using the log-rank test (P < .05).
RESULTS:
The posts and cores were examined clinically and radiographically. The mean observation period was 42.3 ± 2.7 months. The overall survival rate was 95.45%. Comparisons revealed that the difference between premolars with no coronal wall retention and premolars that had maintained one to four coronal walls was statistically significant (P = .0006). On the contrary, comparison between premolars with one and two residual walls was found to be not significant for the overall survival rate (P = .0698).
CONCLUSION:
A satisfactory clinical performance was observed for preformed oval-shaped glass fiber posts. Survival was higher for teeth retaining three and four coronal walls
Simplified technique for rebuilding a post and core foundation with a preexisting crown: a case report.
No full textEffects of Nd: YAG laser irradiation on the root canal wall dentin of human teeth: a SEM study.
No full textLong-term survival of endodontically treated, maxillary anterior teeth restored with either tapered or parallel-sided glass-fiber posts and full-ceramic crown coverage
No full textOBJECTIVES:
This retrospective study investigated the clinical effectiveness over up to 8 years of parallel-sided and of tapered glass-fiber posts, in combination with either hybrid composite or dual-cure composite resin core material, in endodontically treated, maxillary anterior teeth covered with full-ceramic crowns.
METHODS:
The study population comprised 192 patients and 526 endodontically treated teeth, with various degrees of hard-tissue loss, restored by the post-and-core technique. Four groups were defined based on post shape and core build-up materials, and within each group post-and-core restorations were assigned randomly with respect to root morphology. Inclusion criteria were symptom-free endodontic therapy, root-canal treatment with a minimum apical seal of 4mm, application of rubber dam, need for post-and-core complex because of coronal tooth loss, and tooth with at least one residual coronal wall. Survival rate of the post-and-core restorations was determined using Kaplan-Meier statistical analysis.
RESULTS:
The restorations were examined clinically and radiologically; mean observation period was 5.3 years. The overall survival rate of glass-fiber post-and-core restorations was 98.5%. The survival rate for parallel-sided posts was 98.6% and for tapered posts was 96.8%. Survival rates for core build-up materials were 100% for dual-cure composite and 96.8% for hybrid light-cure composite.
CONCLUSIONS:
For both glass-fiber post designs and for both core build-up materials, clinical performance was satisfactory. Survival was higher for teeth retaining four and three coronal walls
Sectional porcelain veneers for a maxillary midline diastema closure: a case report.
No full textDiastema closure is a frequently requested, technique-sensitive cosmetic procedure. There are many techniques and materials that can be employed to close diastemas. While direct composite techniques can be economical and successful, they do present challenges in achieving satisfactory clinical and esthetic results. Traditional porcelain veneer placement may offer an excellent esthetic result, but typically requires the removal of tooth structure; as such, this is an irreversible procedure. The present article reports the case of a maxillary midline diastema closure in a healthy dentition by means of sectional porcelain veneers simply cemented onto the natural teeth and without tooth preparation. A step-bystep procedure is proposed for illustrating the proper implementation of an additive-only and noninvasive indirect technique that yields a satisfactory clinical and esthetic outcome for clinician and patient
Long-term survival of endodontically treated, maxillary anterior teeth restored with either tapered or parallel-sided glass-fiber posts and full-ceramic crown coverage
No full textObjectives: This retrospective study investigated the clinical effectiveness over up to 8 years of parallel-sided and of tapered glass-fiber posts, in combination with either hybrid composite or dual-cure composite resin core material, in endodontically treated, maxillary anterior teeth covered with full-ceramic crowns. Methods: The study population comprised 192 patients and 526 endodontically treated teeth, with various degrees of hard-tissue loss, restored by the post-and-core technique. Four groups were defined based on post shape and core build-up materials, and within each group post-and-core restorations were assigned randomly with respect to root morphology. Inclusion criteria were symptom-free endodontic therapy, root-canal treatment with a minimum apical seal of 4 mm, application of rubber dam, need for post-and-core complex because of coronal tooth loss, and tooth with at least one residual coronal wall. Survival rate of the post-and-core restorations was determined using Kaplan-Meier statistical analysis. Results: The restorations were examined clinically and radiologically; mean observation period was 5.3 years. The overall survival rate of glass-fiber post-and-core restorations was 98.5%. The survival rate for parallel-sided posts was 98.6% and for tapered posts was 96.8%. Survival rates for core build-up materials were 100% for dual-cure composite and 96.8% for hybrid light-cure composite. Conclusions: For both glass-fiber post designs and for both core build-up materials, clinical performance was satisfactory. Survival was higher for teeth retaining four and three coronal walls. (C) 2008 Elsevier Ltd. All rights reserved
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
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