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. Author manuscript; available in PMC: 2021 Feb 1.
Published in final edited form as: J Dent. 2019 Dec 30;93:103269. doi: 10.1016/j.jdent.2019.103269

Table 4.

Crack-level characteristics of subjects with a cracked tooth.

ALL Increase in # cracks Increase in # symptoms Decrease in # of symptoms
(N = 1,850) (N = 106) (N = 194) (N = 421)
Crack-level characteristics. N1 Col%2 N Row %3 N Row %3 N Row %3
Stained 1,508 82% 91 6% 158 10% 336 22%
None stained 342 18% 15 4% 36 11% 85 25%
adjusted OR4 OR = 1.36 OR = 0.90 OR = 0.78
adjusted p5 P = 0.22 P = 0.61 P = 0.075
Detectable with an explorer 1,258 68% 73 6% 126 10% 293 23%
None were … with explorer 592 32% 33 6% 68 11% 128 22%
adjusted OR OR = 0.92 OR = 0.95 OR = 1.01
adjusted p P =0.7 P = 0.76 P = 0.94
Block transilluminated light 1,202 65% 73 6% 110 9% 280 23%
None blocked … light 648 35% 33 5% 84 13% 141 22%
adjusted OR OR = 0.99 OR = 0.80 OR = 1.07
adjusted p P = 0.98 P = 0.24 P = 0.57
Connected with restoration 1,337 72% 83 6% 142 11% 319 24%
None … w/ restoration 513 28% 23 4% 52 10% 102 20%
adjusted OR OR = 1.34 OR = 0.94 OR = 1.18
adjusted p P = 0.20 P = 0.75 P = 0.24
Connected w/ another crack 119 6% 5 4% 11 9% 33 28%
None … with another crack 1,731 94% 101 6% 183 11% 388 22%
adjusted OR OR = 0.61 OR = 0.70 OR = 1.29
adjusted p P = 0.24 P = 0.25 P = 0.21
Extended to root 353 19% 23 7% 54 15% 93 26%
None extended to root 1,497 81% 83 6% 140 9% 328 22%
adjusted OR OR = 1.25 OR = 1.50 OE = 1.23
adjusted p P = 0.36 P = 0.063 P = 0.16
Directions of cracks
In horizontal direction 547 30% 35 6% 61 11% 132 24%
None in horizontal … 1,303 70% 71 5% 133 10% 289 22%
adjusted OR OR = 1.28 OR = 1.08 OR = 1.19
adjusted p P = 0.26 P = 0.72 P = 0.18
In vertical direction 1,733 94% 100 6% 184 11% 397 23%
None in vertical direction 117 6% 6 5% 10 9% 24 21%
adjusted OR OR = 0.89 OR = 1.01 OR= 1.35
adjusted p P = 0.8 P = 0.97 P = 0.24
In oblique direction 177 10% 11 6% 18 10% 55 31%
None in oblique direction 1,673 90% 95 6% 176 11% 366 22%
adjusted OR OR = 1.11 OR = 1.01 OR = 1.38
adjusted p P = 0.8 P = 0.96 P = 0.11
Surfaces cracks involved
Mesial 798 43% 56 7% 100 12% 198 25%
None involved mesial 1,052 57% 50 5% 94 9% 223 21%
adjusted OR OR = 1.33 OR = 1.42 OR = 1.09
adjusted p P = 0.19 P = 0.02 P = 0.49
Occlusal 806 44% 55 7% 81 10% 191 24%
None involved occlusal 1,044 56% 51 5% 113 11% 230 22%
adjusted OR OR = 1.49 OR = 0.81 OR = 1.05
adjusted p P = 0.10 P = 0.22 P = 0.70
Distal 904 49% 57 6% 100 11% 235 26%
None involved distal 946 51% 49 5% 94 10% 186 20%
adjusted OR OR = 1.07 OR = 1.06 OR = 1.41
adjusted p P = 0.7 P = 0.65 P = 0.005
Facial 975 53% 55 6% 106 11% 242 25%
None involved facial 875 47% 51 60% 88 10% 179 20%
adjusted OR OR = 0.92 OR = 1.00 OR = 1.38
adjusted p P = 0.6 P = 0.98 P = 0.008
Lingual 941 51% 55 6% 110 12% 218 23%
None involved lingual 909 49% 51 6% 84 9% 203 22%
adjusted OR OR = 0.90 OR = 1.12 OR = 1.08
adjusted p P = 0.6 P = 0.48 P = 0.52
More than 1 surface 846 46% 59 7% 87 10% 206 24%
None involved > 1 surface 1,004 54% 47 5% 107 11% 215 21%
adjusted OR OR = 1.55 OR = 0.90 OR = 1.11
adjusted p P = 0.053 P = 0.50 P = 0.38
1

Column Ns not summing to column total N above due to missing data.

2

Column percents not summing to 100 due to rounding.

3

Percent of column within level of crack characteristic.

4

OR: Odds ratios adjusted for clustering of patients within practice.

5

P: P-value adjusted for clustering of patients within practice.