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At least 325 records · Page 18Linked to original sources
PubMed2004

Interdisciplinary treatment including forced extrusion and reintrusion of a traumatized mandibular incisor for a patient with Class II Division 1 skeletal open bite.

A woman with Class II Division 1 long-face syndrome characteristics had a history of facial trauma, dentoalveolar fracture of her mandibular anterior teeth, and temporomandibular joint pain. The pretreatment apical radiograph showed a large area of external root resorption of the mesial surface of the mandibular left central incisor. To arrest the external root resorption, the mandibular left central incisor was extruded. During extrusion, sequential apical radiographs were taken. As the tooth moved away from the site of osteoclastic activity, resorption ceased, and repair took place on the root surface. At this time, the mandibular left central incisor was intruded, the mesial defect self-repaired, the tooth remained vital, and the periodontial ligament was intact. The biologic bases for this cessation of resorption and the repair of the tooth's surface are presented.

Adult↗
PubMedDate not supplied

[A case of open bite].

The Authors describe the classification of the malocclusion by Angle, and considerate one open byte case, may be caused by extrusion of first lower right molar, describing orthodontic treatment for his correction.

Adolescent↗
PubMed1980

Correlations between orofacial muscle activity and craniofacial morphology in a sample of control and anterior open-bite subjects.

In order to investigate the correlations between genioglossus, masseter, and orbicularis oris muscle activity and craniofacial morphology, an electromyographic and cephalometric analysis was undertaken on a series of twenty-four human subjects. The activity from the muscles was recorded during voluntary opening movements of the mandible monitored by an electronic transducer. A computer-based method was devised to calculate the threshold incisor-separation position corresponding to a 20 percent increase in base line muscle activity for each of the muscles. In addition, twenty-seven anatmoic points were digitized from lateral head films, and a computer-based cephalometric analysis was completed for each subject. A number of significant correlations were found between the threshold muscle values and the thirty-one linear and angular morphologic variables. Low threshold values for the genioglossus muscle were correlated with negative overbites, undererupted maxillary and mandibular incisors, and low total face heights. Low threshold values for the masseter muscle were also associated with low overbite measurements. In contrast, orbicularis oris muscle thresholds did not appear to be correlated with any of the craniofacial variables measured. This interdependence of tongue and jaw muscle activity and facial morphology suggests a contribution of the musculature to the development and/or maintenance of the dentition.

Adult↗
PubMed1989

[Masticatory forces and maximum jaw closure forces of complete denture wearers before and after bite opening].

The maximum jaw closure forces and the masticatory forces during the comminution of soft and though food were measured with changing vertical dimensions. The maximum jaw closure force was reduced by a mean 25% in all patients after the vertical dimension had been increased. Significant reductions in the masticatory forces were found only on the working side with the forces decreasing rather during the chewing of soft than tough food. Thus, in chewing sour drops the average masticatory force was 32.9 N as against 46.6 N, whereas in chewing bread it dropped to 21.3 N as against 42.8 N. The study showed that increasing the vertical dimension in endentulous patients up to an interocclusal clearance of 0 mm resulted in a functional impairment of speech and mastication and, above all, in sore spots and inflammations of the mucosa.

Bite Force↗