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At least 919 records · Page 51Linked to original sources
PubMed1990

Nasion true vertical: a proposed method for testing the clinical validity of cephalometric measurements applied to a new cephalometric reference line.

A method is proposed to test a true vertical reference line through nasion and also other, more traditional, cephalometric variables on their ability to discriminate between clinical profiles. Twenty-seven women with Class I occlusion and normal overbite and overjet were divided clinically into three horizontal profile types (retrognathic, orthognathic, and prognathic) by five judges. A t test, discriminant analysis, and graphic plot interpretation were performed on the data of the orthognathic and retrognathic groups. The anteroposterior position of the maxilla was found to be irrelevant to the profile classification of the subjects investigated. For the variables describing mandibular position, only SNB performed well (P less than .01). The best discriminators were those variables that related one jaw to the other. The effective horizontal discrepancy between mandible and maxilla (AB distance) showed superior performance as an indicator of profile type (P = .001). Orthodontic and surgical treatment toward a value within the orthognathic AB range may provide a skeletal framework contributing to profile harmony.

Adolescent↗
PubMed1989

[The effect of protrusive splint therapy on the dento-facial skeletal pattern].

Twenty-five adult patients with temporomandibular joint anterior disc displacement with reduction of initial and intermediate phase were applied mandibular anterior repositioning splint therapy and changes in dento-facial skeletal pattern and facial profile were evaluated. By the use of splint, the differences in ANB, SNA angle; SE, Mo-MS, Ms-S dimensions; overjet, overbite and anterior facial height were found statistically significant. The changes occurred in profile and GoGn-SN angle did not show significance.

Adult↗
PubMed1989

[Case report of orthodontic approach to temporomandibular disorders].

The purpose of the present article is to describe a case in which malocclusion patient accompanied with temporomandibular disorders was treated with the fixed appliance and Gnathological Tooth Positioner. Patient, a girl aged 16 years 9 months, had a skeletal Class III malocclusion with mandibular protrusion and anterior edge to edge bite. Centric Relation Splint was made to alleviate the acute symptoms and Gnathological Tooth positioner at the finishing stage of fixed appliance was applied to achieve the functional occlusion. After 12 months of active treatment, the patient gained a normal overbite-overjet relationship. Observation after 2 years out of retention revealed a stable occlusion.

Adolescent↗
PubMed1989

[Case of bimaxillary protrusion and lip evaluation on cephalogram].

One of the goals of orthodontic treatment is to obtain the best balance and harmony of facial lines, especially it is important to retract the lip in bimaxillary case. A 12-year and 4-month-old boy was first seen with the chief complaint of excessive lips protrusion. We treated him by the edgewise method for 34 months, and evaluated the change of facial profile. Excessive lip protrusion was eliminated, and arch leveled. Overjet and overbite were reduced. Mandibular growth increased the prominence of the chin, and reduce the protrusion of the lower lip.

Humans↗
PubMed1989

[Application of the segmented arch technique in adult patient].

The segmented arch technique has been developed with the three primary objectives; (1) force control over active and reactive teeth, (2) reduction in the number of chair hours required to treat a case, and (3) minimization of patient cooperation. The author experienced the efficiency and superiority of the segmented arch technique through the treatment of the Korean adult patient. With the possibility of accurately measuring the forces and moments delivered to tooth during orthodontic therapy, not only is it possible to improve the quality of orthodontic tooth movement, but it is also possible to learn about the nature of optimal forces that are needed clinically. A number of mechanisms have been described for initial levelling, deep overbite correction, anterior retraction, root movement and occlusal seating.

Adult↗
PubMed1989

[Survey on nutrition of infants in the Tokyo metropolitan area. 1. Carious dentitions, anomalies of occlusion and ways of eating].

In September, 1987, a survey on the nutrition of infants was conducted with 1,235 children from 3 to 6 years of age selected from six nurseries and six kindergartens in the metropolis of Tokyo. We compared the survey results with other similar survey reports with respect to three areas; 1, caries attack on primary teeth, 2, anomalies of dentition and occlusion and 3, how foods are eaten, to observe the difference by age and also between children in nurseries and in kindergartens. The following are the results of this comparative investigation. 1) The ratio of caries attacks on the 4-year-old in this survey was 69.6%, which was lower than the 83.4% of the nationwide survey of 1987 conducted by the Ministry of Health and Welfare, while the average value of the df index per person was 4.7, which was lower than the 6.1 of 1981. 2) The caries incidence rate was higher with children in kindergarten than those in nurseries and many kindergarten children had had more than one caries attack. 3) The frequency rate of anomalies of dentition and occlusion in the entire survey sample was 12.9% for deep overbite, 11.4% for open bite and 10.7% for edge-to-edge bite. 4) In the survey of how foods were eaten, the question, "Does your child like to eat things that are hard to bite on?" was asked, and 10.4% of the group answered "My child prefers eating soft food," which was quite high. To the question, "Does your child often eat things that are difficult to eat?", 17.1% of the entire group answered, "My child refuses to." This tendency was greater among the children in kindergaretens.

Child, Preschool↗
PubMed1989

[Two cases of temporomandibular arthrosis of young children].

Two cases of temporomandibular arthrosis were reported. Case 1 was a 6 years 4 months old female with pain in her left mandibular region in moving her jaw. Opening of the mouth by herself was slightly limited. Clicking noise was seen and felt from both of her temporomandibular joints. She was in the dental developmental stage IIA by Hellman, and had deep overbite (5mm). Roentogenographic examination revealed a bony defect on her left condylar head. Treatment was performed with an activator. Pain was not felt and the mandibular opening recovered after 2 weeks of treatment. Roetogenographs showed no bony defect on her left condylar head after 5 months of treatment. Case 2 was a 3 years 2 months old male with clicking noise from both of his temporomandibular joints. There was no pain and no limitation of his mouth opening. He was in the dental developmental stage IIA by Hellman, and had large overjet (8mm). He has thumb sucking habit since the age of one year. He is now under regular observation.

Activator Appliances↗
PubMedDate not supplied

[Lower incisor extraction in orthodontic treatment].

Lower incisor extraction in orthodontic treatment was rare. Precise diagnosis and treatment planning should be done to achieve good occlusion and facial esthetics. Criteria for lower incisor extraction included degree of crowding, tooth size discrepancy, pathologic condition, vertical overbite, sagittal incisal relationship, skeletal growth pattern and age of the patient. This article comprised case reports of three Thai patients, all demonstrating the criteria for lower incisor extraction in orthodontic treatment. With comprehensive analysis, diagnosis and treatment planning, treatment results were satisfactory.

Adolescent↗
PubMed1989

[Relationship between an inclination of mandibular plane and a morphology of symphysis].

In order to investigate the relationship between inclination of mandibular plane and morphology of symphysis, 225 adult subjects' cephalograms were measured. Measurements of the mandibular and facial morphology were: SN-MP, gonial angle, SNA, SNB, SNP, ramus angle, SN-GN, L1 to MP, U1 to L1 angle, overbite, and overjet. Measurements of the symphysis were: thickness of symphysis, length of symphysis, height of symphysis, grade of mental protrusion, inclination of symphysis, curve of symphysis, and sectional area of symphysis. From these measurements, the inclination of mandibular plane and morphology of symphysis were compared. Then the following results were found: 1. There is negative correlation between mandibular plane angle (SN-MP angle) and thickness of symphysis at point B. There is more negative correlation between mandibular plane angle and thickness of symphysis at the apex. 2. There are no correlations between mandibular plane angle and thickness of symphysis at the base. 3. There is positive correlation between mandibular plane angle and height of symphysis. There is positive correlation between mandibular plane angle and length of symphysis. 4. There is positive correlation between mandibular plane angle and grade of mental protrusion. 5. There is a slightly positive correlation between mandibular plane angle and inclination of symphysis. There is a slightly positive correlation between mandibular plane angle and curve of symphysis. 6. There are no correlations between mandibular plane angle and sectional area of symphysis (bone volume of symphysis).

Adult↗
PubMed1989

[Dental health examination in infancy and early childhood. Part 2. The results of dental survey and screening of dental caries].

The purpose of this study was to analyze the relationship between the caries incidence, oral environment at the age of 1.5 years and the prevalence of the caries at the age of 3.5 years in order to establish the methods of dental health surveys on infants and to prevent dental caries. Oral health examination and caries activity (Cariostat) test were performed on 436 children successively undergoing dental health examinations of 1.5-year-old and 3-year-old children, and the following results were obtained: 1. Concerning the condition of dental caries prevalence, percentages of children with dental caries, mean deft and mean defs were 10.6%, 0.36 and 0.68 at the age of 1.5 years and 67.2% 4.43 and 8.41 at the age of 3.5 years, respectively. 2. According to dental surfaces, the mesial proximal surface and lingual surface of primary central incisor in the upper jaw showed a high defs rate of 4.6% at the age of 1.5 years. At the age of 3.5 years, the occlusal surface of primary second molar in the lower jaw, the mesial proximal surface of primary central incisor in the upper jaw and the occlusal surface of primary second molar in the upper jaw had defs rates as high as over 35%. 3. Concerning the condition of occlusion, normal occlusions and deep overbites appeared at almost the same frequencies occupying about 70% of overall occlusions. 4. A risk of dental caries became higher when the body weight at birth was higher, eruption occurred earlier, a fissure in the enamel of primary was deeper, Cariostat pH was lower, and/or no interdental spaces between primary incisors in the upper jaw; therefore the author recognized the necessity of individual health guidance and aftercare.

Child, Preschool↗
PubMed1989

[Critical evaluation of the relations between onset and outcome of treatment in the management of mesial bite].

In patients with mesial bite the outcome of treatment by chin caps and/or Fränkel's functional appliance was evaluated. Of 30 patients with Angle class III anomalies pre- and posttreatment telemetric films and models were reviewed. Patient were subdivided in 2 groups: Group I with deciduous teeth on their pretreatment films (ID) and group II with permanent teeth on their pretreatment films (IP). In group I (ID) patients treatment produced more extensive skeletal modifications than in group II (IP) patients, who had shown severer abnormalities before treatment. In group I (ID), the modifications obtained by treatment appeared to be more persistent than in group II (IP). Patients in group I (ID) showed reduction of the gonion angle, shortening of the ramus, reduction of the SNB and SNPog angles and increase of the ANB angle. In group II these parameters were not substantially improved. Overbite and overjet readings were ideal in group I (ID). Signs of dental compensation were seen in both groups.

Activator Appliances↗
PubMed1989

[Effects of myofunctional disorders on occlusion following surgery for mesial bite].

In a follow-up study of 24 patients with mesial bite operated on at the Department of Oral and Maxillofacial Surgery, University of Innsbruck Medical School, relations between the outcome of sagittal splitting and myofunctional disorders were investigated. Orofacial imbalances of variable extent were found to be present in 16 of the patients followed up. Effects of myofunctional factors on occlusal position, occlusion, overbite and overjet are reviewed. Five patients with particularly severe myofunctional disorders underwent detailed logopedic and myofunctional evaluation. Results are presented. As myofunctional factors may profoundly affect the late results of surgery, it is concluded that patients with myofunctional disorders should undergo adjuvant myofunctional rehabilitation before or at least after surgery in order to prevent relapses.

Adolescent↗
PubMed1989

Permanent dentition occlusion in Chinese, Indian and Malay groups in Malaysia.

This survey outlines the proportion of the various features of occlusion in the permanent dentition of the three ethnic races, Chinese, Malay and Indian in Malaysia. The mean age of the high school children surveyed was 16.4 years. The Chinese and Malays had almost similar distribution of the different types of occlusion. There was a significantly higher prevalence of Class III occlusion among the Chinese and Malays as compared to the Indians. In addition, an edge to edge incisor relationship seemed to be a norm in the Chinese (54%) and Malays (50%) whilst the overjet of between 2-4 mm and the overbite of between 1/3 to 2/3 was more normal to Indians (50%). A crowded dentition was also a norm for the three races.

Adolescent↗
PubMed1989

[Longitudinal study of dental arch forms, with special reference to normal and malocclusions].

The purpose of the present study was to investigate the developmental changes of dental arch forms by using longitudinal materials. The data was derived from dental casts and roentgenographic cephalograms collected from a longitudinal growth study of Japanese children from the age of 5 to 15 years. The materials were divided into three groups of occlusion at the time that the children had full permanent dentitions as follows; normal occlusion group (N-group; N = 19), Angle's class I crowding group (CR-group; N = 11), Angle's class II malocclusion group (CL2-group; N = 7). In addition, members of these groups were classified into three developmental stages as follows; deciduous, mixed and permanent dentition. The developmental changes in dental arch forms were analyzed from metrical measurements of dental casts and roentgenographic cephalograms. The measurements, such as dental arch lengths, widths, amount of interdental space or crowding, mesiodistal crown diameters, overjet and overbite, were obtained from dental casts, and those of incisor inclination angles and ANB angles were from roentgenographic cephalograms. Finally, principal component analysis was performed to clarify the developmental changes of dental arch forms in the series of longitudinal data. The results were as follows; 1. A method was devised for drawing dental arch forms directly from dental casts using compasses, sliding calipers and rulers. 2. Dental arch lengths and widths of the CR-group were uniformly smaller from the deciduous to permanent stages than those of the N-group. 3. The CL2-group showed nearly the same sizes of arch lengths and widths as the N-group at the deciduous stage. Nevertheless, these dimensions of the CL2-group increased considerably and showed larger sizes of arch lengths and widths than the N-group in mixed and permanent stages except in the case of maxillary arch widths. 4. The sum of mesiodistal crown diameters of the CR-group were quite similar to those of the N-group in all three stages. On the other hand, the CL2-group tended to be larger in both arches than the N-group in all stages. 5. So far as the deciduous stage is concerned, the amount of interdental space was significantly larger in the N-group than in the other two groups. 6. Throughout all stages, there were no significant differences in the maxillary central incisor inclination angles among the three groups, while the CR-group tended to show lingual inclination of the mandibular central incisor compared with the other two groups.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1989

[The incidence of malocclusion in the school population of the the Province of Trieste].

The results of an epidemiological investigation on the prevalence of malocclusions in the school population of the Province of Trieste carried out on a sample of 2099 subjects aged 10 and 12 are reported. Subjects were classified according to Angle classes. Other malocclusion parameters such as overjet, overbite, median line deviation, crossbite and upper and/or lower crowding have also been investigated.

Adolescent↗
PubMedDate not supplied

[Root resorption: preliminary considerations and case report].

This article presents a review of the literature on the action of 5 (five) possible predisponent agents of root resorption (treatment time, amount of dental movement, amount of force used, individual susceptibility and trauma) during orthodontic treatment and describes a clinical case with pronounced overjet and overbite where, the presence of resorption in one traumatized tooth limited the mechanics to light forces only.

Child↗
PubMed1977

[Indications for and usefulness of all-plastic dentures].

All-plastic bridges are mainly indicated as temporary bridges. As a definitive measure they are indicated only in case of sagittal shoulder, slight overbite and secure support in the posterior region for the replacement of a missing incisor.

Dental Stress Analysis↗