Prosthetic misfit of implant-supported prosthesis obtained by an alternative section method

Abstract

PURPOSEAdequate passive-fitting of one-piece cast 3-element implant-supported frameworks is hard to achieve. This short communication aims to present an alternative method for section of one-piece cast frameworks and for casting implant-supported frameworks.MATERIALS AND METHODSThree-unit implant-supported nickel-chromium (Ni-Cr) frameworks were tested for vertical misfit (n = 6). The frameworks were cast as one-piece (Group A) and later transversally sectioned through a diagonal axis (Group B) and compared to frameworks that were cast diagonally separated (Group C). All separated frameworks were laser welded. Only one side of the frameworks was screwed.RESULTSThe results on the tightened side were significantly lower in Group C (6.43 ± 3.24 µm) when compared to Groups A (16.50 ± 7.55 µm) and B (16.27 ± 1.71 µm) (P<.05). On the opposite side, the diagonal section of the one-piece castings for laser welding showed significant improvement in the levels of misfit of the frameworks (Group A, 58.66±14.30 µm; Group B, 39.48±12.03 µm; Group C, 23.13±8.24 µm) (P<.05).CONCLUSIONCasting diagonally sectioned frameworks lowers the misfit levels. Lower misfit levels for the frameworks can be achieved by diagonally sectioning one-piece frameworks.

Comparison of marginal and internal fit of press-on-metal and conventional ceramic systems for three- and four-unit implant-supported partial fixed dental prostheses: An in vitro study

“…3,6,[10][11][12][13][14] Clinically acceptable misfit levels have been defined for fixed dental prostheses at between 50 and 120 mm. 3,[15][16][17] For computer-based restorations, a marginal gap of under 200 mm has been stated to be clinically acceptable. 7,18 Some studies have found that a marginal gap of under 100 mm is clinically acceptable.…”

Influence of Resin Cements on the Tension Force of Cast Frameworks Made by the Technique of Framework Cemented on Prepared Abutments

“…It is important to mention that there are other methods that could be used to improve the adaptation of one-piece casted frameworks, such as electroerosion and laser welding (12,13). These techniques are widely used and their effectiveness on improving fit of implant frameworks has been demonstrated.…”

Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

“…A complete prosthetic treatment involves several clinical and laboratory procedures, such as impressions, cast/die pouring and prosthesis fabrication [1][2] . Errors can occur at any of these steps and may result in a prosthetic misfit 1,[3][4] . Therefore, the impression material plays an important role in minimizing errors when producing accurate replicas of the oral structures 1,4 .…”

“…Errors can occur at any of these steps and may result in a prosthetic misfit 1,[3][4] . Therefore, the impression material plays an important role in minimizing errors when producing accurate replicas of the oral structures 1,4 . The elastomeric impression materials are materials with high accuracy and have been used in dentistry since the 1950s.…”