1,720,976 research outputs found
MARGINAL BONE LOSS,BIOLOGICAL WIDTH AND GEOMETRIC SHAPE OF THE ABUTMENT:7-YEAR FOLLOW-UP OF AN ABUTMENT CALLED Trumpet R
Full text linkBackground. Marginal bone resorption observed around osseointegrated implants after the first year is particularly dangerous, especially if the implants are sandblasted and etched. In this case, this MBL can open the way to bacteria that, by colonizing the implant surface, can trigger peri-implantitis and the loss of the implants and the prosthesis screwed onto them. The aim of this work was to evaluate the MBL around implants inserted with a mathematical protocol and prostheticized with a one-time abutment called Trumpet. Materials and Methods: 10 patients were considered who needed an all-on-six rehabilitation (5) and single rehabilitations (5). Measurements of the soft tissue thickness and the distance between the crest and the implant neck (CI) were performed at the time of surgery and at a distance of 1.3 and 7 years. Results: Clinical and radiographic controls performed at a distance of 1.3 and 7 years of the treated patients showed the same CI distance (Crest-Implant) in all patients without observing marginal bone loss. Conclusions: The use of a mathematical model that takes into account the soft tissue thickness for the positioning of the implant with respect to the bone crest and the use of abutments that give more space to the soft tissues to respect the biological width seems to be the correct way to avoid the loss of marginal bone around the implants
Biological Oriented Immediate Loading: A New Mathematical Implant Vertical Insertion Protocol, Five-Year Follow-Up Study
Full text linkOne of the current major challenges in implant therapy is to minimize marginal bone loss around implants, since it can trigger bacterial colonization of the implant’s neck, leading to its failure. The present study aimed (1) to scientifically validate a new mathematical rule based on soft tissues thickness, for choosing the correct implant position with respect to the bone level, in order to provide a better tissue adaptation to the abutment/implant surface to avoid bacterial invasion, and (2) to apply this mathematical rule to the Biological Oriented Immediate Loading (B.O.I.L.) surgical protocol, avoiding peri-implant bone resorption. N. 127 implants were inserted following B.O.I.L. protocol: implants were placed according to the mathematical rule Y = X − 3, which correlates the position of the implant from the bone crest level (Y) with the thickness of the soft tissues (X). All the implants were inserted in fresh extraction sockets, and immediately loaded with temporary abutments and prostheses. Bone levels were evaluated through radiographic examination just after surgical procedure (T0), and after 10 days (10D), 6 months (6M), 1 year (1Y), and 5 years (5Y). After 5 years, the implant survival rate was 100%, with a medium marginal bone loss around implants of 0.0704 mm (SD = 0.169 mm). One-way ANOVA, followed by Tukey’s multiple comparison test was performed for statistical evaluations (p < 0.05). This protocol provided a safe and successful procedure, with a good soft tissue seal against bacterial challenge. The application of the mathematical rule allows the implant placement in a correct vertical position from the bone crest, avoiding bone resorption and bacterial infiltrations. Moreover, the use of Multi Unit Abutment (MUA) determined a stable biological seal, favouring the implant healing and preserving the adhesion of hemidesmosomes to the titanium of MUA
RARE ODONTOSTOMATOLOGY COMPLICATION ASSOCIATED WITH DISLOCATION OF A SILASTIC NASAL SPLINT: A CASE REPORT
Full text linkSilastic is a type of silicone elastomer that has been widely used in various medical applications. One of its popular uses is in aesthetic medicine, specifically as an implant in the nose to enhance its appearance. The potential complications of extrusion, infection, and migration are minimal if the implant is placed in a separate watertight compartment with a tension-free closure and no impingement of the nasal dome. In this Case Report the patient arrived with a periodontitis disease and the silastic sheet was found adjacent to the incisor teeth during oropharyngoscopy to treat acute periodontitis. The authors do not know if the silastic sheet was the direct cause of the acute periodontitis or if the periodontitis creates the migration the infection and the extrusion of the implant. It is possible that the silastic sheet used in the previous rhinoplastic surgery reconstruction had migrated to the perimeter of the premaxilla and induced the chronic inflammation around the teeth or more probably some conditions such as initially gingivitis, complicated on Periodontitis precipitated the acute purulent inflammation of the periodontal tissue and followed by implant extrusion, foreign body reaction, and infection
Unconventional use of Invisalign® in the treatment of ectopic palatal maxillary canines
Full text linkBackground: The proper development of the dental arches, including the eruption and correct positioning of the canines in the arch, is essential for the oral health of growing patients. Impacted canines not only give rise to functional challenges but also pose esthetic issues for patients. The aim of this article is to show if it is possible to benefit from the exclusive use of transparent aligners to guide the eruption of ectopic upper canines into the arch in the correct position. Case report: The subject of the study is the clinical case of a 13-year-old female growing patient who presented displaced upper permanent canines located in the palatal ectopic site. Following the surgical extraction of the retained deciduous elements, treatment with aligners for repositioning the ectopic canines in the arch was performed in two phases. At the end of the treatment, a Class I canine was achieved with satisfactory repositioning of the upper canines in the arch. Conclusion: The use of transparent aligners makes it possible, with some procedural precautions and in carefully selected cases, to reposition the ectopic palatal canines in the dental arch using a treatment that is both esthetic and effective
Relationship between the healing rate of post-extraction sites and the quantity of platelets present in the blood: a retrospective observational study
No full textBackground: In daily surgical practice, the dentist deals with various types of oral surgery. At the first visit, the patient fills out a questionnaire about their state of health. If the questionnaire does not reveal any particular hematological problems, no special tests are usually required to determine the platelet count. The aim of this prospective study was to evaluate the healing process of patients and its correlation with platelet levels before surgery. Methods: A total of 50 patients were included in whom blood chemistry tests were performed with special attention to the platelet count and before their mandibular eights were extracted .The type of healing (EHI) and pain on the second day (VAS) were assessed using methods validated in the literature. Results: After the EHI and VAS scores were noted in the medical records, envelopes containing the platelet scores of the previously requested blood samples, which were not read at the time of observation, were opened. An increase in EHI scores and a decrease in VAS scores was observed that were statistically significantly correlated with increasing platelet scores. Conclusions: These results suggest that the dentist should request chemistry tests on preoperative blood, especially if the patient is to undergo a particularly demanding oral surgical procedure, such as implants, guided bone regeneration or complex extractions
Evaluation of the Efficacy of Different Irrigation Systems on the Removal of Root Canal Smear Layer: A Scanning Electron Microscopic Study
Full text linkIrrigation represents a crucial step in endodontics for bacteria disinfection and smear layer removal. Several irrigation strategies have been proposed, although their effects are controversial. This study aims to assess the comparison of four different irrigation systems on the smear layer removal utilizing scanning electron microscopy (SEM). Forty sound monoradicular teeth were collected and casually allocated into four groups (n = 10): Group A, conventional irrigation; Group B, IrriFlex irrigation; Group C, ultrasonic irrigation system; Group D, apical negative pressure irrigation. After chemo-mechanical preparation and longitudinal root separation, the three root thirds were analyzed by SEM. Micrographs were carried out at ×2000 to analyze the smear layer residual in each third of the root canal. Statistically significant differences were found between Group A and Group D (p < 0.05). Groups B and C showed satisfactory results in the coronal and middle thirds, while Group D was the only system that achieved satisfactory results in the apical third. However, the complete smear layer removal in the root canal was never achieved with any of the four systems tested. In conclusion, among the four tested irrigation systems, the greatest efficacy on smear layer removal was reached by Group D
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
Microscopic Analysis and Evaluation of Thermal Elevation and Wear of Drills for Implant Site Preparation: An In Vitro Study
Full text linkDrilling for implant site preparation generates heat, which can cause bone necrosis if temperatures exceed 47 °C for over a minute. Factors influencing heat include drill size, speed, pressure, irrigation, and tool wear. Frequent drill replacement is essential, as wear from repeated use and sterilization affects performance. This study compared three pilot drills with similar designs from different manufacturers, testing each on pig ribs for 15 perforations after 15 sterilization cycles. Researchers measured temperature increase, drilling time, and surface wear. Results showed that drill no. 1 generated more heat than drills no. 2 and no. 3, though none reached critical temperatures. Drill no. 2 took the longest to reach the desired depth and displayed the most deformation. Findings highlight the importance of adhering to the recommended operational limits, suggesting that drills should be replaced after 15 cycles to ensure efficacy and patient safety
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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