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Effect of Clasp Design on Retention at Different Intervals Using Different Abutment Materials and in a Simulated Oral Condition
Author(s) -
Helal Mohamed A.,
Baraka Osama A.,
Sanad Mohamed E.,
AlKhiary Yasser,
Ludwig Klaus,
Kern Matthias
Publication year - 2014
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12072
Subject(s) - abutment , enamel paint , materials science , orthodontics , significant difference , dentistry , dental abutments , composite material , mathematics , engineering , structural engineering , medicine , implant , statistics , surgery
Purpose The purpose of this study was to compare the retention of circlet (E) clasps and back‐action clasps against three abutment surface materials during long‐term simulation of attachment and detachment. Material and Methods Forty‐eight test models were constructed by placing premolars (natural abutments or metal dies) inside metal blocks to test different abutment retention surface materials (sound enamel, composite resin, and glass‐ceramic; 16 each). The models were duplicated into investment models for construction of circlet (E) and back‐action clasps. Removal and insertion cycling of clasps was carried out for 250, 500, 1000, 2000, 4000, 8000, and 16,000 cycles. The retention of each clasp was measured before cycling and after each interval. Data were analyzed using 1‐way‐ANOVA, 2‐way‐ANOVA, and Mann‐Whitney U tests. Results No significant differences in retention of either clasp were found between the three abutment material surfaces; however, there was a significant decrease in retention force of the circlet (E) clasp between 1000 and 2000 cycles but not of the back‐action clasp. Conclusions (1) The back‐action clasp maintains its retention force for a longer period than the circlet (E) clasp. (2) Composite resin contouring of teeth provided retention comparable to enamel and a ceramic material.