Table 5.

Fringe-order polymerization-shrinkage stress of composites areas of different thickness

Comparison areas	Composite	Median fringe order (range)
		1/3 mm	2/1.5 mm	3/1 mm	P-value
1 and 7	Filtek Z250	0.79 (0.60–1.62) Aa	0.38 (0–0.79) Aa	0.60 (0–1.38) Aa
	SureFil SDR Flow	0.60 (0.60–1.38) Aa	0.60 (0.28–0.79) ABa	0.45 (0–0.60) Ba	P=0.016
	N’Durance	0.60 (0–0.79) Aa	0.79 (0.28–1.62) Aa	0.60 (0–0.79) Aa
2 and 6	Filtek Z250	1.81 (0.60–2.67) Aa	1.61 (1.20–3.60) Aa	0.90 (0.79–2.33) Aab
	SureFil SDR Flow	1.20 (0.90–2.00) Aa	1.00 (0.79–1.20) Ab	0.90 (0.45–1.20) Ab
	N’Durance	0.79 (0.60–1.20) Ba	1.20 (0.79–1.81) ABab	1.81 (1.38–3.60) Aa	P=0.008
	P-value		P=0.008	P=0.008
3 and 5	Filtek Z250	0.79 (0.45–1.20) Aa	1.20 (0.79–2.20) Aa	0.60 (0.60–2.20) Aab
	SureFil SDR Flow	0.90 (0.60–1.20) Aa	0.79 (0.45–1.20) Aa	0.79 (0.28–1.10) Ab
	N’Durance	0.79 (0.45–1.10) Ba	0.79 (0.60–1.81) ABa	1.20 (1.10–1.81) Aa	P=0.016
	P-value			P=0.016
4	Filtek Z250	0.79 (0.60–1.38) Aa	0.90 (0.60–1.38) Aa	0.60 (0.28–0.79) Aa
	SureFil SDR Flow	0.90 (0.79–1.10) Aa	0.79 (0.60–0.90) Aa	0.79 (0.60–0.90) Aa
	N’Durance	0.79 (0.28–0.79) Aa	0.79 (0.60–1.20) Aa	0.79 (0–1.06) Aa

Notes: Medians followed by distinct letters (uppercase in horizontal and lowercase in vertical comparison) differ from each other (P≤0.05). Statistical analyses confined to corresponding areas of comparison.