916 research outputs found
Preservation of peri-implant soft and hard tissues using platform switching of implants placed in immediate extraction sockets: a proof-of-concept study with 12- to 36-month follow-up
No full textThe purpose of this article is to evaluate the soft- and hard-tissue response to immediately placed implants. In addition, assessment was conducted of the soft tissue response to a transmucosal abutment which was narrower than the implant platform
Effect of a Connective Tissue Graft in Combination With a Single Flap Approach in the Regenerative Treatment of Intraosseous Defects
No full textBackground: In the attempt to limit the post-surgery increase in buccal gingival recession (bREC), effect of a connective tissue graft (CTG) when combined with a buccal single flap approach (SFA) in the regenerative treatment of intraosseous defects is evaluated. Methods: Data related to 30 patients with an intraosseous defect treated with a buccal SFA with (SFA+CTG group; n = 15) or without (SFA group; n = 15) placement of a CTG and regenerative treatment were retrospectively derived at three clinical centers. bREC and probing parameters were assessed at presurgery and 6 months post-surgery. Results: In addition to a significant attachment gain and probing depth reduction, adjunctive use of a CTG to a buccal SFA in the regenerative treatment of periodontal intraosseous defects associated with a buccal bone dehiscence resulted in a limited post-surgery bREC, a lower prevalence of defects with a clinically detectable apical displacement of the gingival margin, and an increase in gingival width and thickness. Conclusion: Adjunctive use of a CTG in the regenerative treatment of intraosseous defects associated with buccal bone dehiscence accessed by buccal SFA may support the stability of the gingival profile
Socket grafting in the posterior maxilla reduces the need for sinus augmentation
No full textThis study compared the dimensional alterations, the need for sinus floor elevation, and the histologic wound healing of augmented and nonaugmented alveolar sockets. Sixteen human extraction sockets were either grafted or left untreated. At baseline and 3 and 6 months postextraction, alveolar ridge alterations were evaluated; at 3, 6, and 9 months, histologic analyses were conducted. Implant placement with or without sinus floor augmentation was decided at 6 months. Three of eight patients in the control group underwent sinus floor augmentation compared to one of six in the experimental group. The alveolar ridge augmentation procedure presented here increases the possibility of inserting implants without the need for a sinus augmentation procedure
Advanced reconstructive technologies for periodontal tissue repair
No full textReconstructive therapies to promote the regeneration of lost periodontal support have been investigated through both preclinical and clinical studies. Advanced regenerative technologies using new barrier-membrane techniques, cell-growth-stimulating proteins or gene-delivery applications have entered the clinical arena. Wound-healing approaches using growth factors to target the restoration of tooth-supporting bone, periodontal ligament and cementum are shown to significantly advance the field of periodontal-regenerative medicine. Topical delivery of growth factors, such as platelet-derived growth factor, fibroblast growth factor or bone morphogenetic proteins, to periodontal wounds has demonstrated promising results. Future directions in the delivery of growth factors or other signaling models involve the development of innovative scaffolding matrices, cell therapy and gene transfer, and these issues are discussed in this paper
Soft tissue healing in alveolar socket preservation technique: histologic evaluations
No full textAfter tooth extraction, 14 alveolar sockets were grafted with porous bovine bone mineral particles and covered with non-cross-linked collagen membrane (test group), and 14 alveolar sockets were left uncovered. At 5 and 12 weeks, microvascular density (MVD), collagen content, and amount of lymphocytes (Lym) T and B were analyzed in soft tissue. At 5 weeks, MVD was significantly lower and Lym T was significantly higher in tests than in controls (P < .05). At 12 weeks no differences were found. Placement of resorbable membrane seems to induce an initial and transient modification of the normal wound healing process of the soft tissue
Single-flap approach in combination with enamel matrix derivative in the treatment of periodontal intraosseous defects
No full textTwenty-four periodontal intraosseous defects were accessed with a buccal single-flap approach (SFA) and treated with enamel matrix derivative (EMD) or EMD + deproteinized bovine bone mineral (DBBM) according to the surgeon’s discretion. EMD with or without DBBM was clinically effective in the treatment of periodontal intraosseous defects accessed with a buccal SFA. The adjunctive use of DBBM in predominantly onewall defects seemed to compensate for, at least in part, the unfavorable osseous characteristics in terms of the outcomes of the procedure
Vertical soft tissue augmentation to treat implant esthetic complications: A prospective clinical and volumetric case series
No full textIntroductionChallenging implant esthetic complications are often characterized by implant malpositioning and interproximal attachment loss of the adjacent teeth. However, limited evidence is available on the treatment of these conditions. The aim of this study was to evaluate the clinical, volumetric, and patient-reported outcome following treatment of peri-implant soft tissue dehiscences (PSTDs) exhibiting interproximal attachment loss on adjacent teeth, performed through vertical soft tissue augmentation with implant submersion.MethodsTen subjects with isolated PSTD in the anterior maxilla characterized by adjacent dentition exhibiting interproximal attachment loss were consecutively enrolled and treated with horizontal and vertical soft tissue augmentation, involving crown and abutment removal, two connective tissue grafts, and submerge healing. Clinical outcomes of interest included mean PSTD coverage, mean PSTD reduction, clinical attachment level (CAL) gain at the implant and adjacent sites and soft tissue phenotype modifications at 1 year. Optical scanning was used for assessing volumetric changes. Professional assessment of esthetic outcomes was performed using the Implant Dehiscence coverage Esthetic Score (IDES), while patient-reported esthetic assessment involved a 0–10 visual analogue scale.ResultsThe mean PSTD depth reduction and mean PSTD coverage at 1 year were 2.25 mm, and 85.14%, respectively. A mean keratinized tissue width (KTW) gain of 1.15 mm was observed, while the mean gain in mucosal thickness (MT) was 1.58 mm. A mean CAL gain of 1.45 mm was obtained at the interproximal aspect of the adjacent dentition at 1 year. Greater linear dimensional (LD) changes were observed at the midfacial aspect of the implant compared to the interproximal sites. The mean final IDES was 6.90 points, while patient-reported esthetic evaluation was 8.83 points.ConclusionsThe present study demonstrated that vertical soft tissue augmentation with a submerged healing is an effective treatment approach for the treatment of challenging PSTDs with adjacent dentition exhibiting interproximal attachment loss. This technique can be effective in resolution of esthetic complications in most cases, providing a substantial gain in interproximal attachment levels at the adjacent dentition.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/176261/1/cid13188_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/176261/2/cid13188-sup-0001-AppendixS1.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/176261/3/cid13188.pd
Fine morphology of the myrmecophilous larva of Paussus kannegieteri (Coleoptera: Carabidae: Paussinae: Paussini). Corresponding author
No full textFIGURES 13–18. Paussus kannegieteri third instar larva: 13, thorax, left lateral view; 14, thorax, dorsal view; 15, mesothoracic spiracle; 16, metathoracic spiracle-like structure; 17, mesothoracic leg, anterolateral view; 18, apex of metathoracic leg with lanceolate setae, posterolateral view. CO = coxa, ls = lanceolate setae, m = membrane, ME = mesonotum, MT = metanotum, pe = peritreme, PR = pronotum, un = claw. Scale bars: Figs. 13–14 = 500 µm; Fig. 15 = 10 µm; Fig. 16 = 20 µm; Fig. 17 = 200 µm; Fig. 18 = 50 µm.Published as part of Giulio, Andrea Di, 2008, Fine morphology of the myrmecophilous larva of Paussus kannegieteri (Coleoptera: Carabidae: Paussinae: Paussini), pp. 37-50 in Zootaxa 1741 on page 44, DOI: 10.5281/zenodo.18152
120 Infrabony Defects Treated With Regenerative Therapy : Long Term Results
No full textBackground: The aim of this study is to evaluate the long-term benefits of regenerative therapy and which factors (smoking, oral hygiene (OH), radiographic angle, tooth, clinical center, bio-material) influence the results. Methods: One hundred-twenty infrabony defects were treated with Guided Tissue Regeneration (GTR), using resorbable and non-resorbable membranes with graft, or enamel matrix derivative proteins (EMD). At the baseline smoking, x-ray angle, pocket depth (PPD), recession and clinical attachment (CAL) were recorded. CAL was measured 1 year after surgery and every 2 years for up to 16 years. Patients' participation in the OH protocols was recorded. Results: Baseline CAL was 8.5 ± 2.3 mm, PPD 7.8 ± 2.1 mm and x-ray angle 31.8 ± 8.9 °. One year after CAL gain was 4.1 ± 2.1 mm. EMD was used in 47 defects, resorbable membranes with deprotenized bovine bone in 41 cases, non-resorbable membranes in 7, resorbable membranes and autogenous bone in 5 and combination in 20 defects. 10% were smokers and 20% didn't participate in the OH program. Average follow up was 9 years. 90% of teeth survival was achieved at 13 years and the CAL gained was maintained at 82% for 11 years. Statistical analysis demonstrated that both smoking and OH maintenance influences long-term outcomes. X-ray angle, tooth, clinical center and bio-materials didn't influenced the results. Conclusions: Regenerative therapy provides a high percentage of long-term success. Smoking and non-participation in OH maintenance negatively influence the prognosis, while other factors didn't affect long term results
Decontamination of customized laser-microtextured titanium abutments: A comparative in vitro study of different cleaning procedures
No full textThe aim of this study was to evaluate different cleaning procedures for customized laser-microtextured titanium abutments. A total of 20 customized lasermicrotextured abutments were randomized into four groups: no cleaning (control group), ultrasonic treatments + autoclave cycle (group 1), ultrasonic treatments + argon plasma (group 2), and only argon plasma (group 3). Surface contaminants were assessed through scanning electron microscopy and energy-dispersive x-ray spectroscopy microanalysis. In the control group, 99.96% of the abutment surfaces were contaminated with organic and inorganic pollutants. Group 3 showed the second highest contamination percentage, with almost 23% of the analyzed surfaces polluted. Samples in groups 1 and 2 were almost clean, with negligible traces of microparticles (0.009% and 0.047% of the surfaces were contaminated, respectively). These results were statistically significant for differences between control and test groups, and between groups 1 and 2 in comparison to 3 (P < .001). Abutment decontamination with argon plasma alone might not be as effective on laser-microtextured surfaces as other cleaning protocols
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