ABSTRACT
OBJECTIVES: This RCT aimed to compare zirconia and titanium dental implants in the maxillary premolar region. The comparison was based on marginal bone level (MBL) changes, clinical parameters, aesthetic outcomes, and patient related outcome measures (PROMs) 1 year after prosthetic loading. MATERIALS AND METHODS: Fifty patients were randomly assigned to receive either a zirconia (ZrO2, n = 25) implant or a titanium (Ti, n = 25) bone-level implant. Implants were provided with a lithium disilicate crown 3 months after placement. Follow-up was at 1 month and after 1 year. The primary outcome pertained to changes in MBL. Reported secondary outcomes consisted of implant survival, peri-implant tissue health, aesthetics, and PROMs. RESULTS: Mean MBL change after 1 year was 0.01 mm (SD = 0.45; min = 0.72, max = 0.86) for ZrO2 and -0.09 mm (SD = 0.34; min = 0.53, max = -1.06) for Ti (p = .439). Scores for the other clinical outcome parameters and PROMs were generally favorable, with no significant differences. However, significant differences were found for the aesthetic outcomes regarding two criteria: (a) level of facial mucosa (p = .022), in favor of Ti, and (b) root convexity/soft tissue color and texture (p = .005) in favor of ZrO2. CONCLUSION AND CLINICAL IMPLICATIONS: The ZrO2 and Ti implant types used in this study, replacing a single missing maxillary premolar, show a comparable outcome in terms of MBL change after 1 year. Clinical and aesthetic parameters, as well as PROMs, are favorable and similar between both implant types after 1 year of prosthetic loading. These short-term study results suggest that both are suitable for clinical use.
Subject(s)
Dental Implants, Single-Tooth , Maxilla , Titanium , Zirconium , Humans , Female , Male , Middle Aged , Maxilla/surgery , Adult , Esthetics, Dental , Aged , Treatment Outcome , Crowns , Dental Implantation, Endosseous/methods , Dental Prosthesis, Implant-Supported , BicuspidABSTRACT
A multitude of biomaterials have been used for the production of implants through the years. Titanium or titanium alloy have been regarded as the 'gold standard' for years. However, potential risks and disadvantages regarding biocompatibility and aesthetics have also been reported for the use of titanium in dental implantology. As such, there is need for an alternative material. Zirconia may be regarded as a possible alternative. It is a ceramic with high fracture toughness and other positive qualities, such as beings metal-free, biocompatible, and white, which is aesthetically desirable. Short-term study results of contemporary zirconia implants are promising and comparable to titanium implants. Nevertheless, the material is relatively brittle and susceptible to surface defects. However, no long-term clinical results exists and possible complications are unknown. Long-term clinical research is needed before zirconia implants routine use may be endorsed.
Subject(s)
Ceramics , Dental Implants , Humans , Titanium , ZirconiumABSTRACT
The case of a 29 year-old female patient who had experienced pain in the right midfoot for 5 years which was diagnosed as a degenerative or rheumatic change and treated by physiotherapy and medication. By means of magnetic resonance imaging we identified a soft-tissue tumor of the midfoot. Histology provided the findings of a monophasic fibrous synovial sarcoma. The case history is reported together with a presentation of the disease and its radiological diagnosis.
Subject(s)
Foot Diseases/diagnosis , Magnetic Resonance Imaging , Sarcoma, Synovial/diagnosis , Soft Tissue Neoplasms/diagnosis , Adult , Diagnosis, Differential , Female , Foot/pathology , HumansABSTRACT
Coronal scanning of the paranasal sinuses requires a prone position and hyperextension of the head. As this position is very uncomfortable for the patients, we tried to reduce the duration of the examination by using Spiral-CT. 5 patients were examined with the conventional mode and 5 patients with spiral-CT. Technical factors for the conventional mode were 250 mAs, a slice thickness of 4 mm and an interval of 3 mm. Spiral-CT was performed with 210 mAs, 120 kV, a slice thickness of 4 mm, an increment of 3 mm and a feed of 4 mm/s. The duration of the examination was measured, image quality was compared by using a score, and radiation exposure was measured on the surface of a phantom. Using the conventional mode examination time was 10.3 min, compared with 4.4 min using spiral-CT. Image quality did not differ significantly. Radiation exposure on the surface of a phantom was 29 mGy in conventional mode and 26 mGy in spiral mode. These results were confirmed in 100 further examinations with spiral-CT. The duration of the examination can be significantly reduced by spiral technique without any loss of image quality. The intricate anatomical structures including the important variations can be well defined applying this technique.
Subject(s)
Paranasal Sinus Diseases/diagnostic imaging , Radiographic Image Enhancement/instrumentation , Tomography, X-Ray Computed/instrumentation , Humans , Radiation Dosage , Time FactorsABSTRACT
The following case report describes a solitary epithelioid haemangioendothelioma of the lung as an uncommon radiomorphologic differential diagnosis of an aspergilloma. Epithelioid haemangioendotheliomas are rare low-grade malignant mesenchymal tumours that typically appear multifocally in the body.
