A comparative study of retentive strengths of zinc phosphate, polycarboxylate and glass ionomer cements with stainless steel crowns--an in vitro study.
J Indian Soc Pedod Prev Dent
;
1998 Mar; 16(1): 9-11
Article
in English
| IMSEAR
| ID: sea-115054
ABSTRACT
This study was conducted on 30 extracted human primary molars to assess the retentive strengths of zinc phosphate, polycarboxylate and glass ionomer cements. The teeth were embedded in resin blocks and were randomly divided into 3 groups of 10 each. The occlusal surfaces of all teeth were reduced uniformly by 1.0 to 1.5 mm. All mesial, distal undercuts were removed and sharp angles rounded. This was followed by cementing pretrimmed and precontoured stainless steel crowns on each tooth with hand pressure and storing in artificial saliva at 37 degrees C for 24 hours. Retentive strength was tested using Instron Universal Testing Machine. The load was applied starting from a zero reading and gradually increased until the cemented stainless steel crowns showed signs of movement and then the readings were recorded. It was found that retentive strengths of zinc phosphate and glass ionomer cements were statistically better (P < 0.05) when compared to the polycarboxylate cement. Negligible difference (0. 59 kg/cm2) was however observed between zinc phosphate and glass ionomer cements.
Full text:
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Index:
IMSEAR (South-East Asia)
Main subject:
Polycarboxylate Cement
/
Saliva, Artificial
/
Stainless Steel
/
Stress, Mechanical
/
Tooth, Deciduous
/
Zinc Phosphate Cement
/
Materials Testing
/
Humans
/
Analysis of Variance
/
Dental Bonding
Type of study:
Controlled clinical trial
Language:
English
Journal:
J Indian Soc Pedod Prev Dent
Journal subject:
Dentistry
Year:
1998
Type:
Article
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