Survival rates of axial and tilted implants in the rehabilitation of edentulous jaws using the All-on-four™ concept: A systematic review.

Aim: The aim of this review was to evaluate the survival rate of axial and tilted implants in rehabilitation of edentulous jaws using all on four concept. Setting and Design: Systematic Review. Materials and Methods: A literature review was performed in MEDLINE, PubMed Central (PMC), Google scholar, Embase, Cochrane Central Register of Controlled Trials. Hand searches were conducted of the bibliographic of related journals and systematic reviews. A total of 380 articles were obtained from the intial screening process. Of these articles, 25 articles fulfilled the inclusion criteria. The authors performed evaluation of articles independently as well as data extraction and quality assessment. Statistical Analysis Used: Qualitative analysis. Results: The major prosthetic complication was the fracture of the acrylic prosthesis. The mean cumulative survival rate of implants (72-132 months) were 94% to 98%. The prosthesis survival rate (12 months) was between 99% to 100%. The averaged bone loss was 1.3 ±0.4 mm (12-60 months). No Significant difference was found between survival rates of axial and tilted implants nor between maxilla and mandible. Conclusion: All on four concept can be employed successfully in the edentulous patients with resorbed ridges while improving their quality of life and reducing morbidity. However,randomized clinical trials with large sampling size and long term follow up should be incorporated.

Immediate dentin sealing for indirect bonded restorations.

PURPOSE: The aim of this article is to review available literature on the clinical procedure of immediate dentine sealing for indirect bonded restorations. STUDY SELECTION: More than 40 articles reporting the technique, studies, outcomes, etc. were reviewed after PUBMED/MEDLINE search, most of them addressing the specific situation of dentin bonding for indirect restorations. RESULTS: It is known that tooth preparation for indirect bonded restorations can result in significant dentin exposures. Immediate application and polymerization of the dentin bonding agent to the freshly cut dentin, prior to impression making is therefore recommended by some authors. Literature indicates that this procedure, immediate dentine sealing (IDS), appears to achieve improved bond strength, fewer gap formations, decreased bacterial leakage, and reduces post-cementation sensitivity. This rational approach to adhesion is also reported to have a positive influence on tooth structure preservation, patient comfort, and long term survival of indirect bonded restorations. CONCLUSION: In the extensive literature regarding advantages of using IDS technique significant differences have been shown when compared to Delayed Dentine Sealing. Although more research is required in this field, presently there are NO scientific reasons not to recommend IDS in routine practice.

A comparative evaluation of the marginal accuracy of crowns fabricated from four commercially available provisional materials: An in vitro study.

PURPOSE: The purpose of this in vitro study was to evaluate and compare the primary marginal accuracy of four commercially available provisional materials (Protemp 4, Luxatemp Star, Visalys Temp and DPI tooth moulding powder and liquid) at 2 time intervals (10 and 30 min). MATERIALS AND METHODS: A customized stainless steel master model containing two interchangeable dies was used for fabrication of provisional crowns. Forty crowns (n = 10) were fabricated, and each crown was evaluated under a stereomicroscope. Vertical marginal discrepancies were noted and compared at 10 min since the start of mixing and then at 30 min. OBSERVATIONS AND RESULTS: Protemp 4 showed the least vertical marginal discrepancy (71.59 µ), followed by Luxatemp Star (91.93 µ) at 10 min. DPI showed a marginal discrepancy of 95.94 µ while Visalys Temp crowns had vertical marginal discrepancy of 106.81 µ. There was a significant difference in the marginal discrepancy values of Protemp 4 and Visalys Temp. At 30 min, there was a significant difference between the marginal discrepancy of Protemp 4 crowns (83.11 µ) and Visalys Temp crowns (128.97 µ) and between Protemp 4 and DPI (118.88 µ). No significant differences were observed between Protemp 4 and Luxatemp Star. CONCLUSION: The vertical marginal discrepancy of temporary crowns fabricated from the four commercially available provisional materials ranged from 71 to 106 µ immediately after fabrication (at 10 min from the start of mix) to 83-128 µ (30 min from the start of mix). The time elapsed after mixing had a significant influence on the marginal accuracy of the crowns.

The role of nasendoscopy in the fabrication of a palatopharyngeal obturator - a case report.

Defects confined to the hard palate can be managed with relative ease because it is a static shelf creating oro- nasal separation. Since the soft palate is a dynamic separator between the oral and nasal cavities, defects involving the soft palate require careful consideration. Instrumental visualization methods can aid the fabrication of obturators in patients with such defects and prevent problems of under or over obturation. This case report presents the prosthodontic management of a patient with a Veau class II cleft palate using a palatopharyngeal obturator in order to re-establish normal functions of deglutition and speech. Nasendoscopy was used as an adjunctive procedure to assess velopharyngeal function with the prosthesis.