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Marginal adaptation and microleakage of Procera AllCeram crowns with four cements
THE JOURNAL OF PROSTHETIC DENTISTRY
123. Curtis TA, Shaw EL, Curtis DA. The influence of removable prosthodontic procedures and concepts on the esthetics of complete dentures. J Prosthet Dent 1987;57:315-23. 124. Tautin FS. Denture esthetics is more than tooth selection. J Prosthet Dent 1978;40:127-30. 125. The Academy of Prosthodontics. Principles, concepts, and practices in prosthodontics–1994. J Prosthet Dent 1995;73:73-94. Reprint requests to: DR MICHAEL WALISZEWSKI UNIVERSITY OF WASHINGTON DEPT. OF RESTORATIVE DENTISTRY GRADUATE PROSTHODONTICS BOX 357456–D780 1959 NE PACIFIC ST SEATTLE, WA 98195-7456 FAX: 206-616-8545 E-MAIL: [email protected]
Noteworthy Abstracts of the Current Literature
WALISZEWSKI
0022-3913/$30.00 Copyright Ó 2005 by The Editorial Council of The Journal of Prosthetic Dentistry.
doi:10.1016/j.prosdent.2005.01.004
Marginal adaptation and microleakage of Procera AllCeram crowns with four cements Albert FE, El-Mowafy OM. Int J Prosthodont 2004;17:529-35.
Purpose: This study investigated the effect of different cements on microleakage and marginal adaptation of porcelain crowns. Materials and Methods: Eighty extracted molars were divided into two groups. Teeth in one group were prepared to receive Procera AllCeram crowns, whereas the other group was prepared to receive metal-ceramic crowns. Copings were made following standard techniques, and groups were divided for cementation with zinc phosphate, glass-ionomer, resin-modified glass-ionomer, or resin cement. Specimens were subjected to thermocycling prior to microleakage testing, then sectioned. Microleakage was scored using a five-point scale; marginal adaptation was assessed with a traveling microscope. Results: A significant association was found between cement type and degree of microleakage. With zinc phosphate, 76% of Procera AllCeram and 90% of metal-ceramic copings exhibited extensive microleakage. With glass-ionomer, 49% of Procera AllCeram and 66% of metal-ceramic copings had 0 microleakage scores; with resin-modified glass-ionomer, 10% of Procera AllCeram and 84% of metal-ceramic copings had 0 microleakage scores. With resin cement, 34% of Procera AllCeram and 96% of metal-ceramic copings exhibited 0 microleakage. Procera AllCeram copings had a significantly larger mean marginal gap (54 mm) compared to metal ceramic (29 mm). Conclusion: In both types of crowns, the use of resin cement resulted in the highest percentage of 0 microleakage scores, whereas the zinc phosphate cement resulted in the highest percentage of extensive microleakage.—Reprinted with permission of Quintessence Publishing.
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VOLUME 93 NUMBER 4
123. Curtis TA, Shaw EL, Curtis DA. The influence of removable prosthodontic procedures and concepts on the esthetics of complete dentures. J Prosthet Dent 1987;57:315-23. 124. Tautin FS. Denture esthetics is more than tooth selection. J Prosthet Dent 1978;40:127-30. 125. The Academy of Prosthodontics. Principles, concepts, and practices in prosthodontics–1994. J Prosthet Dent 1995;73:73-94. Reprint requests to: DR MICHAEL WALISZEWSKI UNIVERSITY OF WASHINGTON DEPT. OF RESTORATIVE DENTISTRY GRADUATE PROSTHODONTICS BOX 357456–D780 1959 NE PACIFIC ST SEATTLE, WA 98195-7456 FAX: 206-616-8545 E-MAIL: [email protected]
Noteworthy Abstracts of the Current Literature
WALISZEWSKI
0022-3913/$30.00 Copyright Ó 2005 by The Editorial Council of The Journal of Prosthetic Dentistry.
doi:10.1016/j.prosdent.2005.01.004
Marginal adaptation and microleakage of Procera AllCeram crowns with four cements Albert FE, El-Mowafy OM. Int J Prosthodont 2004;17:529-35.
Purpose: This study investigated the effect of different cements on microleakage and marginal adaptation of porcelain crowns. Materials and Methods: Eighty extracted molars were divided into two groups. Teeth in one group were prepared to receive Procera AllCeram crowns, whereas the other group was prepared to receive metal-ceramic crowns. Copings were made following standard techniques, and groups were divided for cementation with zinc phosphate, glass-ionomer, resin-modified glass-ionomer, or resin cement. Specimens were subjected to thermocycling prior to microleakage testing, then sectioned. Microleakage was scored using a five-point scale; marginal adaptation was assessed with a traveling microscope. Results: A significant association was found between cement type and degree of microleakage. With zinc phosphate, 76% of Procera AllCeram and 90% of metal-ceramic copings exhibited extensive microleakage. With glass-ionomer, 49% of Procera AllCeram and 66% of metal-ceramic copings had 0 microleakage scores; with resin-modified glass-ionomer, 10% of Procera AllCeram and 84% of metal-ceramic copings had 0 microleakage scores. With resin cement, 34% of Procera AllCeram and 96% of metal-ceramic copings exhibited 0 microleakage. Procera AllCeram copings had a significantly larger mean marginal gap (54 mm) compared to metal ceramic (29 mm). Conclusion: In both types of crowns, the use of resin cement resulted in the highest percentage of 0 microleakage scores, whereas the zinc phosphate cement resulted in the highest percentage of extensive microleakage.—Reprinted with permission of Quintessence Publishing.
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VOLUME 93 NUMBER 4