Journal of Prosthodontics
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A Retrospective Analysis of 800 Brånemark System Implants Following the All‐on‐Four™ Protocol Abstract Purpose The purpose of this study was to retrospectively evaluate implant survival rates in patients treated with the All‐on‐Four™ protocol according to edentulous jaws, gender, and implant orientation (tilted vs. axial). Materials and Methods All Brånemark System implants placed in patients following the All‐on‐Four™ protocol in a single private practice were separated into multiple classifications (maxilla vs. mandible; male vs. female; tilted vs. axial) by retrospective patient chart review. Inclusion criteria consisted of any Brånemark System implant placed with the All‐on‐Four™ protocol from the clinical inception (May 2005) until December 2011. Life tables were constructed to determine cumulative implant survival rates (CSR). The arches, genders, and implant orientations were statistically compared with ANOVA. Results One hundred fifty‐two patients, comprising 200 arches (800 implants) from May 2005 until December 2011, were included in the study. Overall implant CSR was 97.3% (778 of 800). Two hundred eighty‐nine of 300 maxillary implants and 489 of 500 mandibular implants survived, for CSRs of 96.3% and 97.8%, respectively. In male patients, 251 of 256 implants (98.1%) remain in function while 527 of 544 implants (96.9%) in female patients survived. Regarding implant orientation, 389 of 400 tilted implants and 389 of 400 axial implants osseointegrated, for identical CSRs of 97.3%. All comparisons were found to be statistically insignificant. The prosthesis survival rate was 99.0%. Conclusions The results from this study suggest that edentulous jaws, gender, and implant orientation are not significant parameters when formulating an All‐on‐Four™ treatment plan. The high CSRs for each variable analyzed demonstrate the All‐on‐Four™ treatment as a viable alternative to more extensive protocols for rehabilitating the edentulous maxilla or mandible.
Journal of Prosthodontics - Tập 23 Số 2 - Trang 83-88 - 2014
In Vitro Evaluation of Adhesion of <i>Candida albicans</i> on CAD/CAM PMMA‐Based Polymers Abstract Purpose To compare the amount of adherent Candida albicans to different CAD/CAM poly(methyl methacrylate) (PMMA)‐based polymers and conventional heat‐polymerized PMMA after long‐term thermal cycling. Materials and Methods The specimens were subjected to 10,000 thermal cycles (5‐55°C) and divided into two groups, uncoated and pellicle‐coated. Surface roughness and contact angles of the specimens were measured. The surface morphology was observed with scanning electron microscopy (SEM). An adhesion test was performed by incubating the disk specimens in C. albicans suspensions at 37°C for 2 hours, and the adherent cells were counted under an optical microscope. The data were analyzed statistically using a variance analysis and Tukey HSD post hoc comparison test. The correlation between measurements was tested using a Pearson correlation analysis (α = 0.05). Results CAD/CAM polymers generally showed statistically significant lowest Ra and contact angle values, whereas conventional PMMA showed the highest Ra and contact angle values in the uncoated group (p < 0.05). Pellicle coating essentially increased contact angle of all materials and reduced the differences in a number of Candida cells on the materials (p < 0.05). Candida adhesion was statistically significantly greatest on conventional PMMA when compared to CAD/CAM polymers. A strong positive correlation was found between the surface roughness of the specimens (p < 0.05) and the amount of adhered cells, whereas no correlation was found between hydrophobicity of the specimens and the amount of adhered cells (p > 0.05). Conclusions CAD/CAM PMMA‐based polymers may be preferable to reduce Candida ‐associated denture stomatitis in long‐term use.
Journal of Prosthodontics - Tập 28 Số 2 - 2019
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