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Biomedical subjects

M C Madeira

Publications and source records attributed to M C Madeira.

At least 19 recordsLinked to original sources
PubMed2000

Joint vibration analysis in patients with articular inflammation.

The study of articular sounds using a computerized system (SonoPAK) in patients with temporomandibular disorders (TMD) of inflammatory origin revealed an increase of vibratory energy when compared to asymptomatic individuals. The following conclusions were reached: 1. The amount of vibratory energy registered in these patients ranged from 8.50 to 57.61 Hz. The major vibrations occurred in the middle of the mandibular opening cycle; 2. The mean vibratory energy measured at less than 300 Hz was between 5.70 and 48.64 Hz and at higher than 300 Hz was between 3.70 and 8.99 Hz; 3. The peak amplitude in the patients with inflammation ranged from 0.35 to 3.96 Pascal and the peak of frequency from 83.20 to 120.20 Hz.

Adolescent↗
PubMed1990

[Transposition of masseter muscle insertion and its influence on anatomical musculo-skeletal changes in the adult rabbit].

Unilateral surgical transposition of the masseter muscle from the masseteric fossa to the central area of the mandibular body below the molar teeth was performed in ten adult rabbits. Six months later the animals were sacrificed, the masseter muscles were dissected and then removed to be fully dried and weighed; the skull was cleaned for anatomical examination of the mandible and the teeth. It was noticed that the transposed muscles were firmly attached and functionally adapted, but underwent a drastic reduction of their weight. The smooth surface of the mandibular body which became activated by the new muscular pull was now rough and irregular due to osseous neoformation. The original area of attachment (masseteric fossa) was remodelled not only regressively but also by bone apposition (exostoses) in some sites. The dental arches kept normal, except for alveolar bone resorption next to the first molar in two animals and accentuated sagittal deviation in another one.

Alveolar Bone Loss↗
PubMed1986

Prevalence of taurodontism in premolars.

Taurodontism does not involve molar teeth exclusively. To call attention to the occurrence of this phenomenon in premolars, 4,459 extracted mandibular and maxillary premolars were examined. Eleven showed evidence of taurodontism. Roentgenograms taken from a buccolingual direction confirmed the diagnosis of taurodont teeth.

Bicuspid↗
PubMed1985

Comparative study between Wits appraisal and I line.

By using a sample of 104 young people of both sexes, 17 of them with a good relation of tooth apical base and little or no incisor discrepancy, the authors tried to establish a possible relationship between the Wits appraisal and the I line and to examine the several correlations among selected groups. The authors find that the values obtained through the two methods together might give a rapid view of the cephalometric condition of the patient with regard to the relationship of the apical structures and discrepancy in the lower incisor relation to the maxillomandibular complex. Based on the findings, the following conclusions might be drawn: Nearly 16% of the sample had a good apical relation and little or no incisor discrepancy The majority of the male population was represented by individuals with a good relation of apical bases and negative discrepancy (dental protrusion) The majority of the female sample was represented by patients with deficient apical relation (slight mandibular protrusion) and negative incisor discrepancy (dental protrusion). The simultaneous usage of Wits appraisal and I line evaluation can offer a simple way to get an objective and rapid vision of the maxillomandibular relation and the incisor discrepancy. But only a meticulous complete clinical and cephalometric examination can establish the critical elements that compose a diagnosis, considering the aetiopathogenesis of the anomalies of the patient and the related data, to proceed with the execution of the correct therapy to be applied in orthodontic treatment.

Adolescent↗
PubMed1979

Absence of the mental foramen in dry human mandibles.

The absence of the mental foramen was investigated in 1,435 dry human mandibles (2,870 sides). The foramen was absent twice in the right side (0.06%) and once in the left side (0.03%). The meaning of this anatomical variation was commented.

Adult↗
PubMed1978

Clinical significance of supplementary innervation of the lower incisor teeth: a dissection study of the mylohyoid nerve.

In view of the relevance of the mylohyoid nerve to clinical difficulties in achieving deep analgesia of the lower incisors, a dissection study was undertaken. Dissection from twenty-six adult cadavers of both sexes were studied with the aid of a dissecting microscope. The following observations were made: (1) A supplementary branch of the mylohyoid nerve entered the mandible through accessory foramina in the lingual side of the mandibular symphysis in 50% of the cases. (2) It generally arose from the right side (76.9%) and entered the inferior retromental foramen (84.6%). (3) The mylohyoid nerve branch either ended directly in the incisor teeth and the gingiva or joined the ipsilateral or contralateral incisive nerve. In view of this information concerning the high incidence of possible involvement of the mylohyoid nerve in mandibular sensory innervation, it is advisable to block it whenever intervention in the lower incisors is indicated. Routine mylohyoid injection is recommended after mental nerve block. If the inferior alveolar nerve is chosen for anesthetic purposes, additional mylohyoid injection should be given only if pain persists. The mylohyoid injection should be given at the inferior retromental foramen on the median aspect of the inferior border of the mandible through extraoral approach.

Adult↗