The symmetric meter on the located on the lower right corner of the Rapidceph is for the assessment of the symmetry of the maxillary and mandibular dental arches and visualize the arch form
Dental arch form
is a reflection of underlying bone morphology.4 Penrose described arch form
as size and shape of the underlying bone.5 Arch form
has also been defined as the position and relationship of teeth to each other in all three dimensions.6 Correct identification of patient's arch form
is an important aspect of achieving a stable, functional and esthetic orthodontic treatment result.
The anatomical features of craniofacial structures, dental arch widths, and dental arch forms
, have been evaluated in literature.3,4,5 Ricketts reported strong correlation between facial type and dental arch width.6
Dental arch forms
in dentoalveoalr class I, II and III.
Majid Zia et al compared the distance of the mesial edge of the maxillary central incisors and the posterior border of the incisive papilla in dentate individuals with different arch form
. He found the values for square arch was 10.5 mm in male and 10 mm in female, Tapered arch 13 and 12.5mm ,ovoid arches 11.2 and 10.5 male and female respectivey.18 Arthur Roraff found the most anterior border of the Incisive Papilla and the labial surface of the MCI in different arch form
as 5mm for square, 6mm ovoid and 7mm tapered.19
Key words: Arch form
, dental arch, measures, dental models, orthodontic
Key words: Arch form
, Angle classification, OrthoformTM templates, SBDC,
Square, ovoid and tapered are the three main categories of dental arch form
.4 In order to achieve an aesthetically pleasant and functionally stable orthod ontic treatment results, it is fundamental to correctly identify and maintain the patient pre-treatment arch form
.2,4 According to long-term studies on retention, alteration to the arch form
results in more post-treatment changes as compared to when the arch form
is maintained.6,9 Evidence suggests that one of the most definitive ways of increasing post-treatment stability is by the maintenance of the pre-treatment arch form
where the teeth are meant to be in their stable position.10-12
The model's wheel arches have black cladding to aid the rugged character, while silver rails arch form
the roofline towards the slanted rear.
The molar relationship, canine relationship, incisor relationship, horizontal incisal overlap (overjet in millimeter), vertical incisal overlap (overbite %), cross bite (lingual or buccal) and the arch form
(square, oval or narrow) were recorded.
At month 4, the upper arch form
was changed from square to ovoid.