Related Experiment Video
Updated: Jul 7, 2026
07:32
Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
Arch widths in adults with Class I crowded and Class III malocclusions compared with normal occlusions
Timothy R Kuntz1, Robert N Staley, Harold F Bigelow
1Sioux City, Iowa, USA.
The Angle Orthodontist
|February 28, 2008
Summary
Adult orthodontic patients with Class I crowded (CICR) and Class III (CIII) malocclusions exhibit significantly narrower maxillary and mandibular arch widths compared to Class I normal (CIN) occlusions. Differences in arch dimensions and gender dimorphisms were observed across these groups.
Area of Science:
- Orthodontics
- Craniofacial Biology
- Dental Morphology
Background:
- Dental arch dimensions are critical for occlusion and facial aesthetics.
- Understanding variations in arch width across different malocclusion types is essential for effective orthodontic treatment planning.
Purpose of the Study:
- To investigate differences in maxillary and mandibular arch widths between adults with Class I crowded (CICR), Class III (CIII), and Class I normal (CIN) occlusions.
- To analyze gender dimorphism within each occlusion group and compare genders across groups.
Main Methods:
- A comparative analysis was conducted on three groups of white American adults with no prior orthodontic treatment: 39 CICR, 40 CIII, and 40 CIN subjects.
- Statistical comparison of arch widths (intermolar, alveolar, intercanine) and gender-related differences was performed using analysis of variance and Duncan's test.
Main Results:
- Class I crowded (CICR) and Class III (CIII) groups showed significantly smaller maxillary and mandibular intermolar and alveolar arch widths compared to the Class I normal (CIN) group.
- Intercanine arch widths were similar across all three groups.
- Gender dimorphisms varied, with the CICR group showing unique patterns in maxillary alveolar and mandibular intercanine widths, while CIII and CIN groups exhibited identical gender dimorphisms.
Conclusions:
- The initial hypothesis of no difference in arch widths and gender dimorphisms between CICR, CIII, and CIN occlusions was rejected.
- Significant differences in arch dimensions exist between normal occlusion and specific malocclusion types, impacting treatment considerations.
Related Concept Videos
01:27Cranial Bones: Lateral View
The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
01:14Cranial Bones: Superior and Posterior View
The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
01:21Tooth Anatomy
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
01:26Assessment of the Mouth
A thorough mouth assessment, including inspection and palpation of the lips, gums, tongue, tonsils, uvula, and pharynx, is crucial in detecting potential health issues. Diseases ranging from oral cancer to systemic conditions like diabetes could be identified early through careful oral examination. This article provides a detailed guide on conducting a comprehensive mouth assessment.
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
Mouth Inspection
The inspection begins with visually examining the mouth for symmetry, color, and size.
01:20Structural Classification of Joints
Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
A fibrous joint is where the adjacent bones are united by fibrous connective...
01:09Functional Classification of Joints
Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...