The retention difference between cobalt chromium and zirconia coping in different angulations on telescopic overdenture

Abstract

Telescopic overdenture is one type of removable denture that uses dual coping system that consists of primary and secondary coping. Retention of telescopic overdenture is obtained from the friction between primary and secondary coping, which is mainly influenced by the type of material and coping angulation. The purpose of this study is to determine the retention differences between CoCr and zirconia coping with 0°, 1°, and 2° angulations. Twenty four pairs of telescopic overdenture coping samples with 6 mm length were divided into 6 groups (n = 4), CoCr 0°, CoCr 1°, CoCr 2°, zirconia 0°, zirconia 1°, and zirconia 2°. Measurement of retention between coping is done by pull-off test using universal testing machine (UTM) and data were analyzed by two way ANOVA. The results showed that the largest average retention was found in zirconia coping with 0° angulation group (22.48 N), while the smallest average retention was found in CoCr coping with 2° angulation group (10.28 N). Two way ANOVA revealed that there were significant differences among groups (p<0.05). LSD tests showed that there were significant differences among all of groups. This study concludes that zirconia coping has higher retention than CoCr coping and coping with 0° angulation has the highest retention.

Effect of Using Different Primary Crown Materials on the Retention of CAD/CAM Telescopic Partial Dentures

“…After 50,000 cycles of the CS representing 3 months of function of RPD, the results showed that the decrease in the retention values was higher in Group II (cobalt-chromium) compared to Group I (zirconia group). This may have resulted from the lower surface roughness of the Zirconia copings than CoCr copings; thus, zirconia copings have a wider contact area or dry friction (FD) [47]. This is consistent with the previous studies which reported that the amount of retention or friction between primary and secondary copings of telescopic over-dentures mostly results from FD, lubricated friction, and boundary friction.…”

“…These three types of frictions can occur when the secondary internal surface coping moves into the loose direction of the primary polishing surface coping. Out of these frictions, FD has the strongest influence since wider contact area between copings will result in greater retention [47], [48]. It was found that irrespective of the measurement stage, the difference between both groups was statistically significant.…”