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At least 253 records · Page 14Linked to original sources
PubMed2006

Traumatic injuries to the primary dentition and effects on the permanent successors - a clinical follow-up study.

This study investigated problems in the permanent dentition that, according to history and records, were attributable to dental alveolar injuries of the primary dentition. 106 children have been involved in the study, who had experienced primary anterior tooth trauma affecting a total of 200 teeth. Thirty-nine patients (81 teeth) were available for follow-up examinations. In 25% of the cases followed up, damage was found on the successors in the secondary dentition (16 children/20 teeth). In half of the cases, a comparatively mild form of lesion like enamel discoloration was observed. This was the result of an injury during the tooth maturation process causing enamel hypoplasia. Clinically more relevant were the dental deformities: cessation of root formation or retention caused by ankylosis, which made up the remaining 50% of cases. This was confirmed by clinical long-term observation. The different effects on the permanent teeth can only be detected by radiography after an interval of several months or may even be clinically assessed only after the eruption of the clinical crown.

Child↗
PubMed2006

Associations between dental fluorosis of the permanent and primary dentitions.

OBJECTIVES: Relatively little is known about associations between primary and permanent tooth fluorosis. In this study, associations between dental fluorosis of the permanent and primary dentitions were assessed. METHODS: Subjects (n = 601) are in the Iowa Fluoride Study, which included fluorosis examinations of the primary and early-erupting permanent dentitions by trained dentist examiners. Relative risks, correlations, and logistic regression assessed associations between permanent tooth fluorosis and primary molar fluorosis. RESULTS: Ten percent had primary molar fluorosis at age 5; 36% had definitive (mostly mild), 28% questionable, and 36% no permanent incisor fluorosis at age 9. Those with primary molar fluorosis were significantly more likely to have definitive permanent incisor fluorosis (76% vs. 32%), and permanent molar fluorosis (59% vs. 16%). The strong association between primary and permanent tooth fluorosis is independent of level of fluoride intake. CONCLUSIONS: Detection of primary tooth fluorosis in pre-school children should alert clinicians and parents to the high likelihood of subsequent fluorosis in the permanent dentition.

Child↗
PubMed1989

Standard forms of dentition and mandible for applications in rotational panoramic radiography.

Mathematical expressions describing the average form and size of the dentition and the mandible are presented. These expressions should be of value in applications of panoramic radiography when reference to an average standard jaw form is of interest. Data were collected from axial radiographs of 35 males and 35 females of three ethnic groups: Mexican-Americans, black Americans and American and Scandinavian Caucasians. Curves were traced on the axial radiographs representing the dentition and the mandible and points along these curves digitized. Mathematical expressions were established using advanced algorithms for orthogonal polynomial curve fitting, i.e. perpendicular distances to the curved dentition and mandible were minimized rather than distances parallel to the y-axis in an arbitrarily chosen coordinate system. The standard deviations around the polynomials defining the average curves are demonstrated and expressions for calculating the continuously varying standard deviations are given.

Dentition↗
PubMed2007

[Prevalence of enamel defects and the relationship to dental caries in deciduous and permanent dentition in Indaiatuba, São Paulo, Brazil].

The aim of this study was to determine the prevalence of hypoplasia, demarcated opacity and dental fluorosis among schoolchildren with deciduous and permanent dentition. The association between enamel defects and dental caries was also verified. The sample consisted of 624 schoolchildren aged 5 and 309 aged 12. The dmft and DMFT indexes were used to assess dental caries prevalence, DDE to assess enamel defects, and Dean to assess fluorosis. Chi-squared test was used to test significance (p < 0.05) and odds ratio to analyze prevalence of dental caries and enamel defects. A positive association between dental caries and enamel defects (hypoplasia, demarcated opacity and dental fluorosis) was observed for schoolchildren aged 5. However, only hypoplasia and demarcated opacity were associated with caries experience in permanent dentition. The results of this study indicated that children had increased odds of dental caries when enamel defect was present, both in deciduous and permanent dentition; further studies are needed to give evidence to this association.

Brazil↗
PubMed2003

A study of growth changes in the mandible from deciduous to permanent dentition.

This cross-sectional study investigated mandibular developmental changes in untreated normal Taiwanese from the deciduous to permanent dentition. Differences in the mean values for ramus height and body length between males and females were statistically significant after eruption of the permanent second molars. SNB angles significantly increased and gonial and L1-MP angles significantly decreased from deciduous to permanent dentition in both sexes. The SN-MP angle in females significantly decreased and ramus inclination in males significantly increased from the early mixed to permanent dentition.

Adolescent↗
PubMed1987

Three-year longitudinal study of mandibular dysfunction in young adults with intact and restored dentitions.

Thirteen adolescents with intact dentitions and 16 with restored dentitions were re-examined after 3 years for signs and symptoms of mandibular dysfunction. In accordance with the results of the first examination, a lower prevalence and degree of clinically recorded dysfunction was found at the follow-up study in subjects with intact teeth than in those with dental restorations. This difference was especially explained by more muscle tenderness recorded in the individuals with restored dentitions than in those with intact teeth. However, the reported symptoms were as a rule mild and relatively evenly distributed in the two groups.

Adolescent↗
PubMed2004

Application of dentition and facial morphology integration system for occlusal correction.

A system to provide quantitative information on the angle between dentition and face was developed using a three-dimensional (3D) integrated configuration measured by a non-contact 3D digitizer. The integrated configuration angles between the Camper's plane and occlusal plane on the sagittal and the horizontal projected planes were obtained. Clinical application for a patient to improve the tegmenta of the anterior tooth by setting a temporary bridge on her lower dentition was attempted. Her dentition and face were measured on her first visit and after treatment, and 3D data of them were integrated. The quantitative change of the angle between the Camper's plane and lower occlusal plane were successfully analyzed by the present system, and after treatment, rotation of the lower occlusal plane for 1 degrees in a clockwise direction on the sagittal plane projection, and that for 1 degrees in a counterclockwise direction on the horizontal plane projection relative to the Camper's plane were detected.

Adult↗
PubMed1999

Temporomandibular joint dysfunction and occlusion in the mixed and permanent dentition.

The aim of this study was to investigate the relation between occlusal factors: Angle classification, overbite, overjet, openbite, anterior and posterior crossbite, scissors bite or buccal crossbite and lateral openbite--and the presence of mandibular dysfunction in a sample of 359 Turkish children with mixed and permanent dentition. Z Test was used to compare the results. It was found that, Class III malocclusion in the permanent dentition and openbite, overbite = 0, overjet = 0, anterior-posterior crossbite in the mixed dentition were related with TMD.

Child↗
PubMed2000

Conservative management of malocclusion in mixed dentition.

The treatment planning in mixed dentition period has changed from extraction to non extraction. Any orthodontic treatment must take into consideration the growth trends and the pubertal growth spurt. The two cases presented here were treated during mixed dentition period in different ways: one with fixed appliances and the other with removable myofunctional appliance therapy, with satisfactory results. Hence for a conservative treatment approach, the non-extraction treatment is recommended in mixed dentition period.

Child↗
PubMed2000

Realistic late-mixed dentition treatment of Class I and II malocclusions.

In contemporary orthodontic practice, a large number of Class I and Class II patients, with and without crowding, are treated without premolar extractions. A wide range of philosophies and devices have been introduced with the aims of providing more space within the arches for the accommodation of the teeth, and influencing the relationships between the upper and lower arches. Some of these philosophies and devices are new--others have been recycled from previously-used models, which may or may not have been discarded for a number of reasons. Much descriptive and anecdotal material has been presented to support these developments. There have also been isolated studies of the effects of various mechanical component parts on dentofacial structures, some using homogenous subject-material, others using quite non-homogenous material. Little quantitative assessment has been made, however, of the effects of holding the E-spaces, uprighting the permanent first molars and redirecting the erupting permanent second molars, on attempts to provide sufficient space within the arches for alignment and levelling, correcting Class II anterior and posterior relationships and finding space for the uncomplicated eruption of the third molars. In addition, none of these space-holding or gaining effects has really been assessed alongside the effects of various attempts to orthopaedically-modify maxillary growth, if necessary, as the mandible naturally moves forward with its dentition. If a likely range of growth and treatment effects could be demonstrated in large relatively homogenous samples, one would have gone someway towards explaining the anecdotal phrase "unlocking the malocclusion", which has so often appeared in the literature. One might also have challenged another widely-held concept--that, when relieving crowding within the dental arches, one is either an extractionist or an expansionist. It might then be possible to show that, in a growing patient with a Class I or II malocclusion, crowding may well be relieved by providing space within the arches (perhaps, at the expense of the third molars), and by allowing the mandible and its dentition to move forward with growth, while forward movement of the maxilla and its dentition is inhibited.

Dental Arch↗
PubMed1998

[One year observation of craniomandibular structure changes of skeletal Class II patients in early permanent dentition].

OBJECTIVE: To study the craniomandibular growth of skeletal class II patients in early permanent dentition so that demonstrate malocclusion development and decide orthodontic treatment opportunity. METHODS: Forty skeletal class II patients in early permanent dentition were selected at random and observed for one year. The lateral cephalometric X-ray films were taken before and after observation for every patient, then Downs analysis and doublet test were made. RESULTS: Female patients' jaws relation didn't change in early permanent dentition, but upper incisors were more protrusive than before, and lower incisors inclined lingualy. Male patients' mandible grew upward and forward, but the absolute value of small change. CONCLUSION: It is necessary to treat skeletal class II deformities early.

Adolescent↗
PubMedDate not supplied

The influence of mandibular dentition on implant failures in bone-grafted edentulous maxillae.

PURPOSE: To evaluate the influence of mandibular dentition on the performance of maxillary implants prior to definitive prosthesis attachment in maxillae that have been reconstructed with autogenous bone grafts. MATERIALS AND METHODS: A retrospective review of 90 consecutive patients, 31 men and 59 women, with a mean age of 57.4 years, was conducted. All patients underwent treatment planning to receive endosseous implants in the edentulous maxilla in conjunction with autogenous bone grafting. During the time from implant and/or bone graft placement until placement of the definitive restorations in the maxillae, the mandibular dentitions were recorded and categorized into 6 groups based upon the presence and distribution of teeth. RESULTS: Of 643 implants placed, 118 (18.4%) were lost between implant placement and definitive prosthesis placement. The type of mandibular dentition was significantly associated with implant failure during this time interval (P < .001). In particular, the patients with implants opposing unilateral occlusal support showed the highest rate of implant failure (43.8%, or 28 of 64 implants). Implants that opposed a mandibular implant-supported fixed prosthesis demonstrated an implant failure rate of 14.3% (10 of 70), and in patients with a removable mandibular denture, the implant failure rate was 6.2% (4 of 65 implants failed). The overall mean patient follow-up was 64.2 months. At 60 months, the cumulative implant failure rate based on the Kaplan-Meier method was 20.2%. DISCUSSION: Unfavorable concentration of forces on the maxilla may contribute to increased risk of implant failure. CONCLUSION: Effort should be made to create a favorable occlusion in the mandible, with attention being paid to broad distribution of occlusal contacts.

Adult↗
PubMed2001

Overbite correction and sagittal changes: late mixed-dentition treatment effects.

This study involved the assessment of pre- and post-treatment lateral cephalograms from 182 late mixed-dentition patients with Class I and Class II malocclusions, with or without crowding, selected before treatment commenced. It was designed specifically to determine whether antero-posterior mandibular dento-alveolar and skeletal changes occurring with growth and one particular late mixed-dentition treatment approach are influenced in any way by the required amount of incisal overbite correction to be achieved with treatment. Significantly greater forward movements were found at both point B and pogonion in non-headgear patients in whom very deep overbites had been reduced, when compared with patients with less required incisal overbite reduction. This finding would seem to have provided further quantitative evidence to support the concept of unlocking of dento-alveolar structures with early reduction of very deep incisal overbites in appropriate patients. The suggestion was therefore made that the bite-opening in such deep-bite patients should be undertaken at least as early as this late mixed-dentition stage in order to provide an improved environment for the mandibular dento-alveolus as the mandible itself moves forward with normal growth.

Analysis of Variance↗
PubMed1999

[Two-dimensional finite element analysis for morphology of craniofacial hard tissue of people with anterior crossbite at early permanent dentition].

OBJECTIVE: To analyze the morphology of craniofacial hard tissue of people with anterior crossbite at early at early permanent dentition. METHODS: The craniofacial morphology of hard tissue of 80 cases anterior crossbite of the early permanent dentition was analyzed by a special computer software system for finite element analysis of two-dimensional cranio-facial structure. RESULTS: The size change of each element was smaller than shape change in cross-bite group, which suggested that the shape change was the main element change; The posterior cranial base was found abnormal in both male and female groups, with counterclockwise rotation occurring at posterior cranial base to some extent; The upper part of face and the maxillary suffered underdevelopment in both male and female groups; The most outstanding change in size and shape occurred at anterior and superior part of mental, with each component of counterclockwise rotation to varying degree. CONCLUSION: Abnormality that occurs in craniofacial hard tissue of people with anterior crossbite at early permanent dentition period is highlighted by abnormal skeletal shape change and rotation, and may be one of the fundamental factors causing crossbite.

Adolescent↗
PubMed1992

Orthodontic treatment in the mixed dentition for the general dentist.

Mixed dentition treatment is an important subject because early treatment could not only correct the occlusion but also may ensure normal development of the teeth. Proper arch form and dental relationships in the mixed dentition lessen the need for additional orthodontic treatment. The objectives in mixed dentition orthodontic therapy are to correct dental arch irregularities, occlusal and jaw relation abnormalities, and to eliminate functional interferences.

Child↗
PubMed2006

Orthodontic treatment in the early mixed dentition: is this the optimum time to start care?

The age at which children should start orthodontic treatment has been debated amongst orthodontists for many decades. Orthodontists can agree on what is a quality orthodontic result, but disagree as to how and when to best obtain this result Some orthodontists contend that starting treatment in the primary dentition is the most effective means of orthodontic care. Other orthodontists would prefer to begin in the early or late mixed dentition. Still others would rather postpone treatment until the permanent dentition at approximately age 12. This article will evaluate the pros and cons of initiating treatment at different ages.

Age Factors↗
PubMed1991

[Development of the dentition in cleidocranial dysplasia].

The purpose of the present investigation was to describe the formation, maturation and eruption of the dentition, including supernumerary teeth in a sample of patients with cleidocranial dysplasia. The dentition was evaluated from orthopantomograms, intraoral radiographs, cephalometric films, surgically removed teeth and intraoral photographs in 22 patients (10 men, 12 women), aged 3.5 to 34 years. Formation of primary teeth was normal, whereas all patients but one had supernumerary permanent teeth. Frequency of supernumerary teeth ranged from 22% in the maxillary incisor region to 5% in the molar regions. Anterior to the molar region supernumerary teeth were formed lingually and occlusally to the normal teeth. Maturation of the primary dentition was normal, while permanent teeth were delayed from 1 to 4 years. Supernumerary teeth were delayed about 4 years in relation to normal permanent teeth. Eruption of primary teeth was normal, whereas all patients had severe eruption problems of permanent teeth.(ABSTRACT TRUNCATED AT 250 WORDS)

Cleidocranial Dysplasia↗