Table 1: Clinical findings in 29 adult patients with anterior bite opening (F = female, M = male, ICP = intercuspal position, transversal relation = neutral if nothing is said,

Pat. No  Age (Years) Overbite (mm)  Angle Class Transvers. Maxillary Teeth Without Occluding Contact in ICP (○)  Maxillary Dental Arch Width (mm)   Possible Cause
Relation Maxillary Teeth with Occluding Contact in ICP (●) of Bite
  18 17 16 15 14 13 12 11 21 22 23 24 25 26 27 28 Opening
1  50 -2.0  II          35.4  Tongue
2  42 0  I    34.6  Splint
3  49 0  I        -  Splint
4  21 0.5  I    32.2  Tongue
5  44 -1.0  I Cross bite, unilat.  33.3  Tongue
6  27 0  I        29.4  Splint
7  32 1.0  I    31.8  Tongue
8*  44 -0.5  I        -  Pregnancy
9  25 -1.0  I    35.8  Splint
10  48 -2.5  I Cross bite, unilat.      31.7  Tongue
11*  33 -1.0  I    -  Pregnancy
12  58 1.0  I        29.6  Tongue
13  36 -1.0  I    33.5  Splint
14  37 -3.0  II Cross bite, unilat.      26.5  Tongue
15  35 0.5  I Cross bite, unilat.  34.0  Tongue
16  41 -1.0  I    36.2  Splint
17  24 -1.0  I    28.7  Tongue
18  43 1.0  I    31.6  Tongue
19  25 -1.0  I    37.0  Tongue
20  71 -3.0  I Cross bite, bilat.      36.8  Tongue
21  25 -0.5  II          31.7  Tongue
22  23 -0.5  I        34.9  Splint
23  37 -4.0  II    30.1  Tongue
24  24 0  I Cross bite, unilat.  34.6  Tongue
25  24 1.5  I        34.7  Tongue
26*  27 -1.0  I    34.0  Breathing diff.
27*  34 -1.0  I        30.0  Breathing diff.
28  47 -1.0  I    37.3  Tongue
29  23 -3.0  I        27.2  Tongue

* pregnancy at start of the bite opening)