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Biomedical subjects

B Ingervall

Publications and source records attributed to B Ingervall.

At least 55 records · Page 3Linked to original sources
PubMed1989

[Reproducibility of rhinomanometric measurements of nose breathing resistance and of x-ray cephalometric recordings of the natural head position in children].

The reproducibility of rhinomanometric recordings of nasal resistance to breathing and of cephalometric recordings of natural head position was studied in 30 children aged seven to 13 years. Posterior rhinomanometry, with and without decongestion of the nasal mucosa, was performed on two occasions. Rhinomanometric registration was possible in 92% of the children but the recorded values for air flow showed a considerable intraindividual variation. The natural standing position of the head and of the cervical spine as well as the relation between the head and the cervical spine was recorded in profile by X-ray cephalometry on two occasions. During the recording, the subject was looking at his face in a mirror. Systematic differences between the duplicate determinations and an accidental error of 4 degrees in the determination of the position of the head and the cervical spine were found. In about 10% of the cases, the differences between the duplicate determinations were greater than 10 degrees.

Airway Resistance↗
PubMed1989

Does the mandible alter its functional position during activator treatment?

The study aimed at revealing possible changes, in activator-free periods, in the positions and movements of the mandible induced by the wearing of an activator. Twenty-one children being treated with three different types of activator for the correction of Angle Class II, Division 1 malocclusion were studied. The movement capacity of the mandible, the rest position, and the position of tooth contact during chewing were recorded with a Sirognathograph before treatment and repeatedly during the first year of treatment. With the exception of a slight increase in the maximal protrusion, no changes in mandibular movement capacity were found. The anteroposterior position of the mandible in the rest position was constant during the period of treatment, but the freeway space increased. No changes in the position of the point of tooth contact during chewing were found. The study produced no evidence of a treatment-induced forward positioning of the mandible in activator-free periods.

Activator Appliances↗
PubMed1989

A clinical study of maxillary canine retraction with a retraction spring and with sliding mechanics.

The efficiency of maxillary canine retraction by means of sliding mechanics along an 0.018-inch labial arch and an AlastiK chain was compared with that using the canine retraction spring designed by Gjessing. The rate of canine retraction and degree of tipping, and rotation of the canines were studied in 21 subjects by one of these two methods on either side of the dental arch. Measurements were made in the mouth and on photographs of dental casts. The canine was retracted faster and with less distal tipping with the spring than with the sliding mechanics. The canine retraction spring was not superior to the sliding mechanics in controlling canine rotation during the retraction.

Adolescent↗
PubMed1989

Lack of correlation between mouth-breathing and bite force.

The correlation between mouth-breathing and bite force was studied in 81 children, 7 to 16 years old. Mouth-breathing was diagnosed on the basis of the subject history, the rhinomanometrically determined nasal airflow and the size of the airway measured on the profile cephalogram. The maximum bite force was measured at the first molars. In addition, the facial morphology was analysed on profile cephalograms. Both mouth-breathing and bite force were associated with the facial morphology but there was no association between mouth-breathing and bite force. It was concluded that the long-face morphology characteristic of mouth-breathing children is not due to weak masticatory muscles.

Adolescent↗
PubMed1989

A comparison between anamnestic, rhinomanometric and radiological methods of diagnosing mouth-breathing.

Three methods of evaluating the mode of breathing were applied in 119 children aged 7-15 years who were to start orthodontic treatment for various malocclusions. The three methods were: the history, rhinomanometric recording of the nasal airflow and determination of the size of the airway on profile and frontal cephalograms. The variables describing the mode of breathing were correlated with the facial morphology and the natural position of the head and the cervical spine as recorded with profile cephalometry. There were no correlations between the results of the evaluation of the mode of breathing obtained with the three methods. Nor were there any correlations between these and the position of the head or the cervical spine. A history of mouth-breathing, the rhinomanometrically determined airflow through the nose and the size of the airway on the profile cephalogram were, however, correlated with the long face morphology characteristic of mouth-breathing. A diagnosis of mouth-breathing should be based on different supplementary methods, the history and the size of the airway on the profile cephalogram being at least as valuable as the rhinomanometric recordina.

Adolescent↗
PubMed1988

Cheek pressure and head posture.

Maxillary cheek pressures are measured in the molar area, at the teeth and high in the buccal sulcus, in both natural and extended head positions, with teeth at rest and in function. Highest pressures are found on the alveolar process, with some increases with the head extended and the jaw at dental rest position.

Adult↗
PubMed1986

Pressure from the lips on the teeth and malocclusion.

The relationship between lip strength and lip pressure (pressure from the lips on the teeth) was studied in 84 children (aged 7 to 16 years) with varying types of malocclusion. The lip strength was recorded with a dynamometer. The lip pressure was measured on the upper and lower central incisors in the rest position, and during chewing and swallowing of crispbread. The lip pressure measurements were made with an extraoral pressure transducer incorporated in a water-filled system with an intraoral mouthpiece. The muscle activity of the lips was recorded electromyographically. Bite and facial morphologies were studied on dental casts and profile cephalograms. There was no correlation between lip strength and lip pressure. Lip strength was lower in children with Angle Class II, Division 1 malocclusion than in children with Class I malocclusion. The lip pressure on the upper incisors, on the other hand, was higher in Class II, Division 1 than in Class I malocclusion, and was lowest in children with Class II, Division 2 malocclusion. The findings suggest that the pressure from the lips on the teeth is a result of the incisor position.

Adolescent↗