187,124 research outputs found
Guided Bone Regeneration with Nonresorbable Membranes in the Rehabilitation of Partially Edentulous Atrophic Arches: A Retrospective Study on 122 Implants with a 3- to 7-Year Follow-up
No full textThe aim of this retrospective study was to evaluate clinical and radiographic outcomes of guided bone regeneration (GBR) procedures in the rehabilitation of partially edentulous atrophic arches. A total of 58 patients were included with a follow-up of 3 to 7 years after loading. Data seem to indicate that GBR with nonresorbable membranes can be a good clinical choice and suggest that it could be used to vertically reconstruct no more than 6 mm of bone in the posterior mandible. However, this technique remains difficult and requires expert surgeons
Learner Analytics and Student Success Interventions
No full textThe implementation of analytics in support of student success requires effective use of feedback and interventions, as well as a system by which the use of feedback and institutional supports can be tracked and evaluated.This accepted article is published as Pistilli, M. D. (2017). Learner analytics and student success interventions. In J. Zilvinskis & V. Borden (Eds.), Learning analytics in higher education. New Directions for Higher Education (2017);179;43-52. Doi: 10.1002/he.20242. Posted with permission. </p
What future in the treatment of severe crestal atrophies: from autologous bone to heterologous bone blocks
No full textIpotesi per un'architettura a pianta centrale in Città di Castello
No full textRestituita dopo un attento restauro architettonico, la rotonda medievalle di Città di Castello resta un enigma interpretativo sia sotto la veste storica sia sotto il profilo tipologico, nonostante la sua pianta centrale sembra apparentarsi a modelli impiegati dagli Ordini militari nell'Europa del Duecento
Guided implant surgery and sinus lift in severely resorbed maxillae: A retrospective clinical study with up to 10 years of follow-up
No full textObjectives: In the posterior maxilla, due to the presence of maxillary sinus, residual bone height lower than 3mm is a critical factor that can affect implant stability and survival. The use of guided surgery may facilitate the surgical procedures and the implant insertion in case of severely resorbed maxillae. Moreover, it may have beneficial effects on the long-term survival and success of implant-supported restorations. This study aimed to evaluate implant supported restorations on severely resorbed maxilla (<3 mm) after sinus lift with collagenated xenograft and guided surgery.Methods: Forty-three patients with need for implant rehabilitation and residual bone height between 1 and 3 mm were recruited. Surgical and prosthetical aspects were planned following digital approach with the use of Realguide 5.0 (3diemme, Varese, Italy). Lateral window sinus lift was performed and implants were placed simultaneously to the augmentation procedure with a tooth-supported pilot drill surgical template. A prehydrated collagenated porcine bone matrix was adopted as regenerative material. Computer-aided-design/ computer-aided-manufacturing (CAD/CAM) restorations were delivered after six months of healing. Milled titanium chamfer abutments with CAD/CAM crowns were used. Bone height at implant site level was measured using an image software analysis applied to the pre- and post-surgical radiographs and at the follow-up. Biological and technical complications were recorded during all the follow-up periods.Results: Fifty-four sinus were treated. After a mean follow-up time of 5.11 years (SD: 2.47), no implants were lost nor showed signs of disease. The mean pristine bone height was 2.07 mm (SD: 075). At the final evaluation the augmented sinus height was 12.83 mm (SD: 1.23). Two cases experienced minor perforation of the membrane, while five patients developed minimal post-operative complications, completely resolved with pharmacologic therapy. No mid-term biological complications were experienced by the patients. No cases experienced periimplant mucositis and peri-implantitis during the whole follow-up period. Four patients (7.4%) faced an unscrewing of the prosthesis.Conclusions: The present study showed the efficacy in the mid-term of the digital planning and the guided surgery in restoring severely resorbed posterior maxilla with dental implants. Clinical Significance: This paper underlines the high potential of the digital approach in the mid-term to implant rehabilitation of severely resorbed maxilla simultaneously with sinus lift
A 5‐year randomized controlled clinical trial comparing 4‐mm ultrashort to longer implants placed in regenerated bone in the posterior atrophic jaw
No full textBackground: Short implants (up to 5-mm long) have shown good results when compared to longer implants placed in augmented bone. Purpose: To evaluate if 4-mm ultrashort implants could also be an alternative to bone augmentation in the severely atrophic posterior jaws. The primary aim of the study was to compare implant survival rates between study groups. Materials and Methods: Eighty partially edentulous patients with posterior atrophic jaws (5–6 mm of bone above the mandibular canal and 4–5 mm below the maxillary sinus) were included: 40 patients in the maxilla and 40 in mandible. The patients were randomized to receive one to three 4-mm ultrashort implants or one to three implants at least 10-mm long in augmented bone. Results are reported 5 years after loading with the following outcome measures: implant and prosthetic failures, complications and peri-implant marginal bone level changes. Results: Thirty-two complications were reported for the control group in 18 patients versus 13 complications in 10 patients in the test group, the difference being not statistically significant (p = 0.103). In the augmented group, 12 implants failed in 6 patients versus 7 short implants in 6 cases, and 9 prostheses failed in the control group while 4 in the test one, without statistically significant differences (p = 1.000 and 0.363, respectively). At 5 years after loading, short implants lost on average 0.58 ± 0.40 mm of peri-implant marginal bone and long implants 0.99 ± 0.58 mm, the difference was statistically significant (p = 0.006). Conclusion: Four-millimeter ultrashort implants showed similar if not better results when compared to longer implants placed in augmented jaws 5 years after loading. For this reason, their use could be in specific cases preferable to bone augmentation since the treatment is less invasive, faster, cheaper and associated with less morbidity. However, longer follow-ups and larger trials are needed
Osteolytic lesions of the jaws: focus on keratocysts and ameloblastomas
No full textOBJECTIVES The objective of this Module is to pro-vide the clinician with a thorough un-derstanding of the aspects of odonto-genic keratocysts and ameloblasto-mas from a radiographic stand point. The topic of discussion is the compar-ison between a conservative versus a surgical approach. Similarities and dif-ferences among the lesions have been highlighted and the elements of radio-graphic as well as clinical diversity an-alyzed, allowing proper differential di-agnosis. MATERIALS AND METHODS The most recent available international literature about keratocysts and amelo-blastomas has been reviewed. Considering that the lesion to date known as keratocyst has changed name over time, the terms dermoid cyst, cholesteoma, primordial cyst and keratocystic tumor were also consid-ered in the literature search. In line with the latest classification of the World Health Organization, only the cases presenting paracheratinized histology were considered. With regards to ameloblastomas, the five variants by which it is classified as: unicystic, conventional, adenomatoid, metastasizing, and peripheral were ex-amined. The adenomatoid variant has only recently been introduced, so there is not much supporting literature yet. The literature was found through the major databases (PubMed, Medline, Scopus, Google Scholar, and Cochrane Library), in addition to decades of aca-demic clinical practice of the authors. RESULTS The datas reported in the literature re-garding keratocysts are extremely het-erogeneous with regards to both the type of treatment and the lesions, fea-tures in terms of location, extent, in-volvement of dental and/or mucosal el-ements and association with syn-dromes. With regards to ameloblasto-mas there is a broader classification and thus a more focused literature. In both keratocysts and ameloblastomas, unicystic forms are often misinterpret-ed and diagnosed retrospectively be-cause they are less known. On the oth-er hand, clinicians often draw their at-tention towards multilocular lesions that are put into differential diagnosis (including the lesser known ones such as glandular odontogenic cyst). DISCUSSION After an initial skimming, a number of lesions still remains in differential diag-nosis. Literature agrees, that these le-sions require a biopsy examination in order to diagnose their nature with cer-tainty. The goal is to implement the most appropriate treatment plan that aims not only to minimize the recur-rence rate but also to ensure a good standard of quality of life for patients. CONCLUSIONS In cases of keratocysts and ameloblas-tomas, correct identification with re-spect to other lesions turns out to be crucial, as a failure to recognize them may give clinical implications such as more invasive surgeries for the patient. CLINICAL SIGNIFICANCE To focus on the often underestimated unicystic forms of keratocysts and am-eloblastomas. The professional should follow a diagnostic flowchart to make a correct diagnosis by clinical, radio-graphic and biopsy examination wich will guided the management of the le-sions in a conservative or intervention-al approach. In addition, the funda-mental differential diagnosis aspects that allow intercepting these types of lesions are highlighted
Pericoronal and well-defined radiolucencies (pt. I)
No full textOBJECTIVES The aim of this Module is to provide the clinician with an in-depth knowledge of the aspects, primarily radio graphic, of the radiolucent lesions that surround the crown of dental elements as well as non-pathological well-de fined radiolucent entities. Similarities and differences among the lesions have been highlighted and the elements of radiographic as well as clinical diversity analyzed, allowing proper differential diagnosis. MATERIALS AND METHODS The authors have included the most recent international literature available on: normal follicular space; den tigerous cysts (also know as follicular cyst); botryoid cyst; eruptive cyst (also know as gengival cyst); osteolysis-related pericoronitis; ameloblastic fibro ma; ameloblastic fibro-odontoma; odontogenic adenomatoid tumor; Pindborg’s tumor; early dental crypts; variants of trabecular medullary structure; Stafne’s lacuna; post-ex traction alveolar socket; focal osteoporotic medullary defect and fibrous healing defect. This literature have been found through the major databases (PubMed, Medline, Scopus, Google Scholar, and Cochrane Library), in addition to decades of aca demic clinical practice of the authors. RESULTS Many lesions have specific features that allow to reduce the diagnostic hypothesis to a smaller pool of cases. The clinician must consider the location, the radiographic appearance, the prevalence among the population divided by age and the elements involved with the radiolucency. These features can guide the clinician trough a correct diagnosis, distinguishing proper lesions from clinical conditions not requiring any treatment. DISCUSSION Based on the involvement or non-involvement of dental elements, the radiolucent lesions examined can be distinguished into peri-coronal and well-defined radiolucency. Radiographies are necessary for a correct diagnosis, but often are not di agnostic alone. They need in fact to be correlated with an accurate anamnesis and knowledge of topography as well as age-distribution. Diagnostic hypothesis guides the treatment approach and the correct follow-up programs, as well as identifying potentially more aggressive lesions and distinguishing them from physiological conditions. CONCLUSIONS Through anamnestic knowledge and an accurate clinical and radiographic investigation, the dental surgeon must be able to discriminate the nature of osteolytic lesions. This diagnostic hypotesis allows to distinguish the cases that require a wait-and-see approach from the cases that require a conservative or aggressive treatment, preceded by a biopsy evaluation when indicated. CLINICAL SIGNIFICANCE This Module provides the clinician with radiographic information useful in formulating a correct diagnostic hypothesis regarding the macro-categories of peri coronal radiolucency lesions and non-pathological well-de fined lesions
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