Current Issue : July - September Volume : 2019 Issue Number : 3 Articles : 6 Articles
(1) Background: Three-dimensional printing is progressing rapidly and is applied in many\nfields of dentistry. Tooth autotransplantation offers a viable biological approach to tooth replacement\nin children and adolescents. Restoring or reshaping the transplanted tooth to the anterior maxilla\nshould be done as soon as possible for psychological and aesthetic reasons. However, to avoid\ninterfering with the natural healing process, reshaping of transplanted teeth is usually delayed\nthree to four months after transplantation. This delay creates a need for simple indirect temporary\naesthetic restoration for autotransplanted teeth. The aim of this study was to develop and validate a\ndigital solution for temporary restoration of autotransplanted teeth using 3D printing. (2) Methods:\nFour dry human skulls and four dry human mandibles were scanned using cone beam computed\ntomography to create 3D models for 15 premolars. Digital impression of the maxillary arch of one of\nthe skulls was captured by intra oral scanner. The digital work flow for the design and fabrication\nof temporary veneers is presented. The seating and adaptation of the 3D printed veneers were\nevaluated using stereomicroscopy and micro-computed tomography. (3) Results: Evaluation of the\nveneer seating using stereomicroscopy showed that the mean marginal gap at all of the sides was\nbelow the cut-off value of 200 micron. The overall mean marginal gap was.....................
Biochemical modification of titanium surfaces (BMTiS) entails immobilization of\nbiomolecules to implant surfaces in order to induce specific host responses. This crossover\nrandomized clinical trial assesses clinical success and marginal bone resorption of dental implants\nbearing a surface molecular layer of covalently-linked hyaluronan in comparison with control\nimplants up to 36 months after loading. Patients requiring bilateral implant rehabilitation received\nhyaluronan covered implants in one side of the mouth and traditional implants in the other side.\nTwo months after the first surgery, a second surgery was undergone to uncover the screw and to\nplace a healing abutment. After two weeks, the operator proceeded with prosthetic procedures.\nImplants were evaluated by periapical radiographs and the crestal bone level was recorded at mesial\nand distal sites-at baseline and up to 36 months. One hundred and six implants were positioned,\n52 HY-coated, and 48 controls were followed up. No differences were observed in terms of insertion\nand stability, wound healing, implant success, and crestal bone resorption at any time considered.\nAll interventions had an optimal healing, and no adverse events were recorded. This trial shows,\nfor the first time, a successful use in humans of biochemical-modified implants in routine clinical\npractice and in healthy patients and tissues with satisfactory outcomes....
The patient was a 41-year-old woman experiencing severe lumbago for several\nyears. The physician-in-charge referred her for dental treatment because\nexamination did not reveal any specific abnormality in her lower back. Prior\nto the treatment, the patient could barely bend forward and backward because\nof serious back pain. Her body flexibility and lower back pain improved\nwhen a gold alloy cast crown was placed near her feet. However, when the\ncrown was covered with aluminum foil, it was again very difficult for her to\nbend her body forward and backward. These results suggested that her body\nreacted positively because good electromagnetic waves emitted by the crown\nwere absorbed by the body. The alloy used to make the crown was chosen\nusing the Bi-Digital O-Ring Test. Moreover, the shape, contact strength, and\nocclusion (biting condition) of the crown were also determined by the\nBi-Digital O-Ring Test. After the crown was placed on her upper right first\nmolar, her lumbago completely disappeared and did not recur for >5 years of\nfollow-up. The effectiveness of electromagnetic waves on the condition of the\nbody, as in this case, has not often been acknowledged in modern medicine,\nand the underlying mechanism remains unclear; therefore, further research is\nrequired....
An association between periodontal disease and cancer has been established in recent\nstudies, but no common etiology has been identified in the hopes of reducing the global burden of\nthese non-communicable diseases. This perspective article hypothesizes that the determinant\nmediating the association of periodontal disease with cancer is dysregulated phosphate\nmetabolism. Phosphate, an essential dietary micronutrient, is dysregulated in chronic kidney\ndisease, and both cancer and periodontal disease are associated with chronic kidney disease.\nReviewed evidence includes the association between phosphate toxicity and cancer development,\nand the association between periodontal disease and chronic kidney disease-mineral and bone\ndisorder includes conditions such as ectopic calcification and bone resorption, which may be\nindirectly related to periodontal disease. Dental calculus in periodontal disease contains calcium\nphosphate crystals that are deposited from excess calcium and phosphate in saliva. Alveolar bone\nresorption may be linked systemically to release of parathyroid hormone in response to\nhypocalcemia induced by hyperphosphatemia. More research is needed to examine the role of\ndysregulated phosphate metabolism in periodontal disease....
The aim of this in vitro study was to compare the quality of digital workflows generated by\ndifferent scanners (Intra-oral digital scanners (I.O.S.s)) focusing on marginal fit analysis. A customized\nchrome-cobalt (Cr-Co) implant abutment simulating a maxillary right first molar was fixed in\nhemi-maxillary stone model and scanned by eight different I.O.S.s: Omnicam® (Denstply Sirona,\nVerona, Italy) CS3500®, CS3600®, (Carestream Dental, Atlanta, GA, USA), True Definition Scanner®\n(3M, St. Paul, MN, USA), DWIO® (Dental Wings, Montreal, Quebec, Canada), PlanScan® (Planmeca\nOy, Helsinki, Finland), 3D PROGRESS Plus® (MHT, Verona, Italy), TRIOS 3® (3Shape, Copenhagen,\nDenmark). Nine scans were performed by each tested I.O.S. and 72 copings were designed using\na dental computer-assisted-design/computer-assisted-manufacturing (CAD/CAM) software (exocad\nGmbH, Darmstadt, Germany). According to CAD data, zirconium dioxide (ZrO2) copings were\ndigitally milled (Roland DWX-50, Irvine, CA, USA). Scanning electron microscope (SEM) direct\nvision allowed for marginal gap measurements in eight points for each specimen. Descriptive\nanalysis was performed using mean, standard deviation, and median, while the Kruskal-Wallis\ntest was performed to determine whether the marginal discrepancies were significantly different\nbetween each group (significance level p < 0.05). The overall mean marginal gap value and standard\ndeviation..................
The purpose of this study was to compare the penetration ability of calcium silicate root\ncanal sealers and conventional resin-based sealer using confocal laser scanning microscopy (CLSM). A\ntotal of 60 recently extracted single-rooted human premolars were used in this study. The root canals\nwere prepared to a size 40/0.06 taper with ProFile rotary instruments and irrigated with NaOCl\nand EDTA. After drying all canals, the specimens were randomly divided into three experimental\ngroups (n = 20): Group 1, gutta-percha (GP)/AH Plus with continuous wave compaction; group 2,\nGP/BioRoot RCS with a single-cone technique; and group 3, GP/Endoseal MTA with a single-cone\ntechnique. All experimental samples were sectioned perpendicular to their long axis using a\nlow-speed diamond wheel at the apical, middle, and coronal third levels. The penetration abilities of\nall samples were evaluated using CLSM. A Kruskalâ??Wallis analysis and a series of Mannâ??Whitney U\npost hoc tests were performed. A higher intensity level was found in the coronal area and a lower\nintensity level in the apical area in all the experimental groups. The AH Plus group showed higher\nsum fluorescence intensity in the apical and coronal thirds compared with the BioRoot RCS and\nEndoseal MTA groups, whereas the BioRoot RCS group showed a higher intensity level in the middle\nthird, similar to the AH Plus group. The maximum sealer penetration depth was low in the apical\narea and high in the coronal area in the AH Plus and Endoseal MTA groups. In the BioRoot RCS\ngroup, maximum sealer penetration was observed in the middle third. In conclusion, there were\nsignificant differences in sealer penetration pattern and distance according to the root level and\nsealer type....
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