The resection angle in apical surgery: a CBCT assessment.

OBJECTIVES The primary objective of the present radiographic study was to analyse the resection angle in apical surgery and its correlation with treatment outcome, type of treated tooth, surgical depth and level of root-end filling. MATERIALS AND METHODS In the context of a prospective clinical study, cone beam computed tomography (CBCT) scans were taken before and 1 year after apical surgery to measure the angle of the resection plane relative to the longitudinal axis of the root. Further, the surgical depth (distance from the buccal cortex to the most lingual/palatal point of the resection plane) as well as the level of the root-end filling relative to the most coronal point of the cut root face was determined. Treated teeth were categorized into four groups (maxillary and mandibular anterior and posterior teeth). The final material comprised 62 treated roots in 55 teeth. RESULTS The mean calculated resection angle of all roots was 17.7° ± 11.4° (range -9.6° to 43.4°). Anterior maxillary roots presented the highest mean angle (25.8° ± 10.3°) that was significantly different from the mean angle in posterior maxillary roots (10.7° ± 9.4°; p 20°), however without reaching statistical significance (p = 0.0905). Angles did not correlate either with the surgical depth or with the retrofilling length. CONCLUSIONS Statistically significant differences were observed comparing resection angles of different tooth groups. However, the angle had no significant effect on treatment outcome. CLINICAL RELEVANCE Contrary to common belief, the resection angle in maxillary anterior teeth was greater than in the other teeth. The surgeon is advised to pay attention to the resection angle when bevelling maxillary anterior teeth in apical surgery

Converting Bilateral Free-End Removable Partial Dentures to Implant-Assisted Removable Partial Dentures Using 6 mm Short Implants: Patient-Reported Outcomes of a Prospective Clinical Study.

The study assessed oral health-related quality of life (OHRQoL) of patients who received two 6 mm short implants in mandibular molar sites, converting existing bilateral free-end removable partial dentures (RPDs) to implant-assisted RPDs (IARPDs). After a postsurgical healing period of 4 months, the participants received a non-retentive dome abutment for 8 weeks, and then a retentive ball abutment for another 8 weeks. Afterwards, the participants made their final choice on which abutment to keep. The final follow-up was 1 year after implant placement. OHRQoL was evaluated with the 49-items version of the Oral Health Impact Profile (OHIP-49) at the abutment exchanges and the final follow-up. Furthermore, numerical rating scales were used to analyze patient satisfaction after 1 year. Questionnaire data of 13 participants were evaluated. Overall, OHRQoL increased with both the dome (p = 0.02) and the ball abutments (p < 0.001), without a significant difference between the abutments (p = 0.953). The questionnaires revealed an improvement in terms of oral situation, quality of life, and masticatory capacity (all p < 0.01). Patients showed a significant preference for the ball abutments (p < 0.001). Converting RPDs to IARPDs resulted in significant improvement of OHRQoL. Patients seem to prefer retentive over non-retentive abutments, although no differences in terms of OHRQoL were observed

O desenvolvimento da autonomia no discurso de adolescentes de origem italiana

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A SERS affinity bioassay based on ion-exchanged glass microrods

14noThe well-known enhancement effect of surface-enhanced Raman spectroscopy (SERS) is associated with the presence of metallic nanostructures at the substrate surface. Different bottom-up and top-down processes have been proposed to impart the substrate with such a nanostructured layer. The former approaches are low cost but may suffer from reusability and stability. The latter strategies are expensive, time consuming and require special equipment that complicate the fabrication process. Here, we present the possibility to obtain stable and reusable SERS substrates by a low-cost silver-sodium ion-exchange process in soda-lime glass microrods. The microrods were obtained by cutting the tip of the ion-exchanged soda-lime fiber, resulting in disks of about few millimeters in length and one hundred microns in diameter. A thermal annealing post-process was applied to trigger the reduction of Ag+ ions into nanoparticles (AgNPs) within the ion-exchanged glass microrods. Afterwards, ion-exchange and thermal treatments were carefully tuned to assure the presence of silver NPs exposed on the surface of the microrods, without using any chemical etching. An AFM analysis confirmed the presence of AgNPs with size of tens of nm on the surface of the fiber probe. A SERS affinity bioassay was developed on the probe with the final aim of detecting microRNA fragments acting as biomarkers of different diseases. Specifically a DNA hybridization assay was built up by anchoring a molecular beacon containing a Raman tag on the Ag surface via thiol chemistry. Initial SERS experiments confirmed the presence of the beacon on the NPs embedded on the microrods surface, as monitored by detecting main spectral bands ascribed to the oligonucleotide chain. Finally, the ability of the platform to interact with the target microRNA sequence was assessed. The analysis was repeated on a number of miRNA sequences differing from the target to evaluate the specificity of the proposed assay.openopenBerneschi, Simone; D'Andrea, Cristiano; Giannetti, Ambra; De Angelis, Marella; Banchelli, Martina; Barucci, Andrea; Boetti, Nadia Giovanna; Pelli, Stefano; Baldini, Francesco; Pini, Roberto; Janner, Davide; Pugliese, Diego; Milanese, Daniel; Matteini, PaoloBerneschi, Simone; D'Andrea, Cristiano; Giannetti, Ambra; De Angelis, Marella; Banchelli, Martina; Barucci, Andrea; Boetti, Nadia Giovanna; Pelli, Stefano; Baldini, Francesco; Pini, Roberto; Janner, Davide; Pugliese, Diego; Milanese, Daniel; Matteini, Paol

Ion-exchanged glass microrods for SERS detection of DNA

Different chemical or physical deposition processes have been previously proposed to equip surfaces with a layer of plasmonic NPs to produce effective SERS responses. Here, we present a SERS biosensor obtained by an ion-exchange process in soda-lime glass microrods for efficient DNA detection

Präimplantologisch-radiologische Diagnostik mittels DVT im posterioren Oberkiefer unter besonderer Berücksichtigung des Sinus maxillaris

Die Kieferhöhle ist ein symmetrisch angelegter, pyramidenförmiger Hohlraum des Gesichtsschädels, der regelmäßig bei der Anfertigung zahnärztlicher Röntgenaufnahmen im Oberkiefer abgebildet wird. Für zahnärztliche Indikationen hat sich die dreidimensionale Darstellung der Kieferhöhle mittels digitaler Volumentomografie (DVT) besonders vor einer geplanten Implantattherapie mit/ ohne Sinusbodenelevation etabliert. Hier ist die Darstellung des Ostium naturale auf dem entspre- chenden FOV (field of view) wünschenswert, aber nicht zwingend. Kenntnisse über Möglichkeiten und Grenzen in der zahnärztlichen Diagnostik helfen dem Zahnarzt zielgerichtete Entscheidungen zu treffen und unnötige bildgebende Maßnahmen zu vermeiden. Kieferhöhlenveränderungen sind häufig und weisen ein breites Spektrum auf, das von einer harmlosen anatomischen Variante bis zu einer bösartigen Neoplasie reicht. Während erstere keine weitere Behandlung erfordert, müssen andere regelmäßig nachkontrolliert oder auch baldmöglichst chirurgisch therapiert werden. Das oft klinisch stumme Wachstum raumfordernder Prozesse in der Kieferhöhle unterstreicht die Bedeutung einer initialen, umfassenden klinischen und radiologischen Befundung, speziell auch im Hinblick auf zahnärztlich-chirurgische Eingriffe in der Kieferhöhle. Weiterführende diagnostische Maßnahmen und radiologische Verfahren sollten dem Spezialisten vorbehalten sein

Use of a New-Generation Mini-Implant and Attachment System for Fabrication of a Maxillary Overdenture.

A new-generation mini-implant system offers a polyether ether ketone matrix and a new-generation surface technology on its patrix. This clinical report describes the treatment of a patient with a new-generation mini-implant-retained maxillary overdenture

Variables Affecting the Accuracy of Static Computer-Assisted Implant Surgery: Bridging the Gap Between Clinical Success and Broad Application

ABSTRACT Over the past decade, the use of digital technology in implant treatment planning and static computer-assisted implant surgery (sCAIS) has revolutionized the planning and execution of guided implant surgeries. However, the predictability of achieving a high degree of accuracy when using a digital workflow and sCAIS has been a subject of debate. For sCAIS procedures to transition from clinical success in individual cases to a broadly applicable procedure, a better understanding and control of variables that affect their accuracy is essential. Recently, a research team in the Department of Oral Surgery and Stomatology at the University of Bern launched a series of in-vitro investigations to further analyze the impact and magnitude of potential variables involved in the digital treatment planning of sCAIS procedures that can have a significant effect on the accuracy of sCAIS. This article presents the rationale and summary of their findings

Early Implant Placement Following Single Tooth Extraction in the Esthetic Zone with Contour Augmentation - Selection Criteria, Surgical Procesures and Long-Term Results

Implant placement post single tooth extraction in the esthetic zone is an important and frequent indication for implant therapy. Today, the clinician can choose from four different treatment approcaches for the timing of implant placement. The decision for the most appropriate treatment plan should be based on a thorough clinical and radiographic examination and well-defined selection criteria. Early implant placement after soft tissue healing is one of the treatment options available. This approach is applied by our team in the case of a thin bone wall phenotype (<1mm) or a missing facial bone wall at the extraction site, and sufficient bone volume available in the palato-apical area to allow good primary stability of the implant. The surgical procedures include a flapless thooth extraction, a 4-to-8 week soft tissue healing period, implant placement in the in the correct 3-dimensional position, a simultaneaous contour agmentation on the facial aspect with the GBR technique using a 2-layer composite graft with locally harvested aoutologous bone chips and a low-substitution bone filler, application of a double-layer collagen membran, and a tension-free primary wound closure. Following 8 weeks of healing, the implant site is reopened with a punch technique, and the implant can be resored with a screw-retained single crown. The rationale for this surgical approach is presented including inclusion criteria, surgical procedures, case reports and long-term documentation

Surgical Strategies in Elderly Implant Patients

The mean age of candidates for implant surgery as well as dental patients is generally increasing due to the growing life expectancy worldwide. While being older per se is no contraindication for implant therapy, it often implies medical conditions and more medication (polypharmacy). These aspects often reduce the resilience of patients and lead to increased risk of complications after implant surgery. The present review first describes typical dental and medical conditions of the elderly and their relevance to implant surgery. The main focus is subsequently set on surgical strategies in elderly patients to minimize the related morbidity without compromising the treatment outcome. Whenever possible, a standard implant placement without simultaneous bone grafting is preferred to offer a low-morbidity procedure. The use of short implants as well as narrow diameter implants is important to avoid bone grafting procedures. In addition, the frequency of flapless implant placement using computer-assisted implant surgery (CAIS) has increased considerably over the past 5 years and has become a highly attractive surgical approach in terms of minimal invasiveness