Table 3.

Comparison of resorption volumes (mm³) of six different surface among the groups

Group	Buccal cervical	Buccal middle	Buccal apical	Lingual cervical	Lingual middle	Lingual apical
Hybrid	0.007 ± 0.012a	0.000 ± 0.001a	0.001 ± 0.001a	0.002 ± 0.004a	0.002 ± 0.005a	0.001 ± 0.002a
Hyrax	0.071 ± 0.049b	0.090 ± 0.124b	0.030 ± 0.020b	0.034 ± 0.050b	0.030 ± 0.030b	0.009 ± 0.010b
Acrylic bonded	0.053 ± 0.020b	0.069 ± 0.042b	0.041 ± 0.026b	0.025 ± 0.027b	0.032 ± 0.027b	0.024 ± 0.014c
Full coverage	0.051 ± 0.031b	0.040 ± 0.020b	0.040 ± 0.025b	0.016 ± 0.018b	0.016 ± 0.024b	0.003 ± 0.007a
p-value	0.0001***	0.0001***	0.0001*	0.017*	0.0001***	0.002**

Values are presented as mean ± standard deviation.

According to the Kruskal–Wallis one-way analysis of variance test and the Mann–Whitney U test (with Bonferroni correction), there is no statistically significant difference between groups with the same letters.

*p < 0.05, **p < 0.01, ***p < 0.001.