A STUDY OF CORE TYPE AND LUTING CEMENTS ON COMPLETE CAST CROWN RETENTION.
- Author:
Sang Hyun PAEK
1
;
Ik Tae CHANG
;
Sun Hyung LEE
;
Jae Ho YANG
;
Seong Joo HEO
Author Information
1. Department of Prosthodontics, College of Dentistry, Seoul National University, Korea.
- Publication Type:Original Article
- Keywords:
Crown retention;
Amalgam core;
Composite resin core;
Cast core
- MeSH:
Alloys;
Crowns*;
Dental Cements;
Glass Ionomer Cements;
Resin Cements;
Seoul;
Sodium Chloride;
Stainless Steel;
Zinc;
Zinc Phosphate Cement
- From:The Journal of Korean Academy of Prosthodontics
2000;38(2):169-177
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The purpose of this study was to compare the retention of complete cast crown over amalgam cores, composite resin cores, and cast gold cores when cemented with three different luting agents. Eighteen core specimens each of amalgam(Bestaloy, Dong Myung, Seoul, Korea), composite resin (Z100, 3M Dental product, st. Paul, Minn) and type N gold alloy (Ba 4, Heesung Engelhard Corp., Korea) were made in a customized milling stainless steel die. A wax pattern with a loop attached to occlusal surface was made for each core and a type 11 gold alloy casting was fabricated. The castings which had clinically acceptable marginal fit were used as test samples. The following luting cements were used to cement cast crowns on each core material : (1) zinc phosphate cement (Confi dental Products Co., USA) (2) glass-ionomer cement (Fuji Plus, GC Industrial Corp., Tokyo, Japan) (3) resin cement (Panavia 21, Kuraray Co., USA). All cements were mixed according to manufacturers instructions. A static load of 5kg was then applied for 10 minutes on the crowns. All specimens were stored in saline solution for 24 hours at 371C and thermocycled for 500 cycles. After storage and cycling, the tensile bond strengths were measured by using a universal testing machine (Instron Corp., Canton, Mass.) at a crosshead speed of 0.5mm/min. The results were as follows : 1. The retentive strength of resin cement was the highest of all three types of cement for resin core (p<0.05). 2. There was no statistical difference among the retentive strengths of three cements for amalgam core (p>0.05). 3. The retentive strength of resin cement was higher than that of zinc phosphate for cast core, but there was no difference between the retentive strength of glass ionomer cement and those of rein and zinc phosphate cement. 4. The retentive strength of the zinc phosphate cement for amalgam core was the highest of all type of cores.
