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James C. Melville Steven S. Balandran Caleb P. Blackburn Issa A. Hanna 《Journal of oral and maxillofacial surgery》2019,77(9):1867.e1-1867.e8
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James C. Melville Christopher Scott Manis Jonathan W. Shum Dhafer Alsuwied 《Journal of oral and maxillofacial surgery》2019,77(4):874.e1-874.e13
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Krysta Sellers John M. Powers Sudarat Kiat-amnuay 《The Journal of prosthetic dentistry》2017,117(2):247-252
Statement of problem
The optimal retention of implant-supported ceramic crowns on zirconia abutments is a goal of prosthodontic treatment.Purpose
The purpose of this in vitro study was to evaluate the retentive strength of implant-supported IPS e.max CAD-CAM (e.max) crowns bonded to custom zirconia implant abutments with different cements.Material and methods
An optical scan of a zirconia custom abutment and a complete-coverage modified crown was designed using an intraoral E4D scanner. One hundred twenty lithium disilicate crowns (IPS e.max CAD) were cemented to 120 zirconia abutment replicas with 1 of 6 cements: Panavia 21 (P21), Multilink Hybrid Abutment (MHA), RelyX Unicem 2 (RXU), RelyX Luting Plus (RLP), Ketac Cem (KC), and Premier Implant (PI). The specimens were stored at 37°C in 100% humidity for 24 hours. Half of the specimens were thermocycled for 500 cycles. The retentive force was measured using a pull-out test with a universal testing machine. Mean retentive strengths (MRS) were calculated using 2-way ANOVA and the Tukey-Kramer test (α=.05).Results
The MRS (MPa) after 24-hour storage were P21 (3.1), MHA (2.5), RXU (2.5), RLP (1.3), KC (0.9), and PI (0.5). The MRS after thermocycling were MHA (2.5), P21 (2.2), RLP (1.8), KC (1.4), RXU (1.1), and PI (0.3). P21 had the highest MRS after 24-hour storage (P<.001), but after thermocycling MHA had the highest MRS (P<.001). RXU showed a significant decrease in MRS after thermocycling (P<.05). Cement residue was mostly retained on the zirconia abutments for P21, while for the other cements’ residue was retained on the lithium disilicate crowns.Conclusions
The cements tested presented a range of retentive strengths, providing the clinician with a choice of more or less retentive cements. MHA was the most retentive cement after thermocycling. Thermocycling significantly affected the retentive strengths of the P21 and RXU cements. 相似文献10.
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The incidence of facial pain and mandibular dysfunction was studied in a population of elderly, middle-class Americans (median age, 71 years) using a self-report questionnaire. The questionnaire was mailed to 839 volunteer subjects of both sexes; responses were obtained from 562 (67%) individuals. Results showed that 536 respondents (95.4%) were free of facial pain and that only 25 (4.4%) had temporomandibular joint pain. Joint sounds and teeth clenching and grinding were associated with facial pain in 50% of those who reported this combination. 相似文献
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