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Information Journal Paper

Title

THE EFFECTS OF NEW DESIGN OF ACCESS HOLE ON PORCELAIN FRACTURE RESISTANCE OF IMPLANT-SUPPORTED CROWNS

Pages

  61-67

Abstract

 Statement of the Problem: One disadvantage of CEMENT-RETAINED crowns is the lack of predictable irretrievability. This problem can be overcome through designing a screw access hole in the metal substructure of CEMENT-RETAINED restoration and using porcelain stain to define this area.Purpose: This study aimed to evaluate the influence of existence of screw access hole on porcelain FRACTURE RESISTANCE of metal-ceramic implant-supported crowns.Materials and Method: Thirty six standardized metal-ceramic crowns were fabricated and divided into 3 groups (n=12); group 1 conventional CEMENT-RETAINED metalceramic crowns as control group, group 2 CEMENT-RETAINED MC crowns in which porcelain stain was used to define the location of screw access channel, and group 3 CEMENT-RETAINED metal-ceramic crowns in the metal substructure of which a hole and ledge was designed in the location of screw access channel. The specimens were cemented (TempBond, Kerr) to their dedicated abutments. A hole was made in the location of screw access channel in group 2 and 3 and filled with photo-polymerized composite resin (3M; ESPE). All specimens were thermocycled and loaded in universal testing machine at crosshead speed of 2mm/min until fracture. Mean values of load at fracture were calculated in each group and compared with One-way ANOVA (a=0.05).Results: Mean value of the load required to fracture the restorations was 1947±487 N in group 1, 1927±539 N in group 2, and 2170±738 N in group 3. No statistically significant difference was found between the FRACTURE RESISTANCE values of the three groups (p> 0.05).Conclusion: Presence of screw access channel in CEMENT-RETAINED implant restorations does not compromise FRACTURE RESISTANCE.

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    APA: Copy

    DERAFSHI, REZA, FARZIN, MITRA, TAGHVA, MASOUMEH, HEIDARY, HOSSEIN, & ATASHKAR, BERIVAN. (2015). THE EFFECTS OF NEW DESIGN OF ACCESS HOLE ON PORCELAIN FRACTURE RESISTANCE OF IMPLANT-SUPPORTED CROWNS. JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES), 16(SUPPLEMENT (1)), 61-67. SID. https://sid.ir/paper/661455/en

    Vancouver: Copy

    DERAFSHI REZA, FARZIN MITRA, TAGHVA MASOUMEH, HEIDARY HOSSEIN, ATASHKAR BERIVAN. THE EFFECTS OF NEW DESIGN OF ACCESS HOLE ON PORCELAIN FRACTURE RESISTANCE OF IMPLANT-SUPPORTED CROWNS. JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES)[Internet]. 2015;16(SUPPLEMENT (1)):61-67. Available from: https://sid.ir/paper/661455/en

    IEEE: Copy

    REZA DERAFSHI, MITRA FARZIN, MASOUMEH TAGHVA, HOSSEIN HEIDARY, and BERIVAN ATASHKAR, “THE EFFECTS OF NEW DESIGN OF ACCESS HOLE ON PORCELAIN FRACTURE RESISTANCE OF IMPLANT-SUPPORTED CROWNS,” JOURNAL OF DENTISTRY (SHIRAZ UNIVERSITY OF MEDICAL SCIENCES), vol. 16, no. SUPPLEMENT (1), pp. 61–67, 2015, [Online]. Available: https://sid.ir/paper/661455/en

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