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Biomedical subjects

F P van der Linden

Publications and source records attributed to F P van der Linden.

At least 19 recordsLinked to original sources
PubMed2003

[The 'van der Linden' retainer].

Normally, only the anterior teeth have to be retained after an orthodontic treatment. For that purpose, a lingually bonded wire is preferred in the mandible and a removable plate in the maxilla. The design of the Van der Linden-retainer is based on theoretical considerations and secures rigid fixation of the six anterior teeth with solid anchorage in that region. A retention plate should not be used to move anterior teeth. However, with instant corrections small improvements can be realized. The fabrication and clinical use of the Van der Linden-retainer is explained and illustrated.

Dental Bonding↗
PubMed2003

[The specialty of orthodontics in European perspective].

After clarifying the role and significance of the European Federations of Orthodontic Specialists Associations (EFOSA), the results of a recent survey on the situation of the Speciality of Orthodontics in Europe are presented. Among the many items included are the recognition and availability of orthodontic specialists, their training, their working conditions, the height of the charged fees and the present insurance and refunding systems.

Credentialing↗
PubMed1999

4D-computerized visualisation of human craniofacial skeletal growth and of the development of the dentition.

The understanding of growth and developmental changes can be improved when shapes and changes in size, proportion, and relationships are visualized in 3 dimensions and at different stages. This applies particularly to craniofacial skeletal growth and the development of the dentition. For that purpose 3D-data were collected from prenatal human heads ranging from 18 up to 275 mm CRL and from a collection of macerated fetal and postnatal skulls. Computer-aided graphical reconstructions were obtained from histological serial sections of embryonic and early fetal specimens. Proportional changes in the growing skull were recorded by means of radiological and cephalometric evaluation. In addition, computed tomography was applied to fetal and postnatal skulls. Furthermore, the prenatal and postnatal development of the dentition was digitized. To that end 3D-polygone sets of these data were read into a workstation computer and animated by means of the software Soft Image (Microsoft). This comprehensive 4D insight into growth facilitates the understanding and teaching of normal and abnormal development.

Abortion, Legal↗
PubMed1998

Stability of transverse maxillary dental arch dimensions following orthodontic-surgical correction of anterior open bites.

A sample of 130 patients with vertical maxillary hyperplasia; mandibular hypoplasia with a high mandibular plane angle; narrow, tapered maxillary dental arch form; and anterior vertical open bite were collected from three different institutions to evaluate the stability of transverse maxillary arch dimensions after correction of the open bite. Surgical treatment consisted of Le Fort I or bimaxillary osteotomies. Intermolar, interpremolar, and anterior arch widths were measured three-dimensionally on dental casts using a Reflex microscope, and transverse stability after orthodontic or surgical maxillary expansion was analyzed. Orthodontic expansion followed by a one-piece Le Fort I intrusion osteotomy was performed in 77 patients, and surgical maxillary expansion by a multisegment Le Fort I intrusion osteotomy was performed in 53 patients. The increase of transverse arch width and the relapse after orthodontic or surgical expansion were not significantly different. The transverse arch width in these two groups did not relapse in 20% of the patients after a mean follow-up of 69 months. An additional bilateral sagittal split osteotomy had no detectable effect on stability. Patients who underwent a multisegment Le Fort I osteotomy stabilized with rigid internal fixation showed better transverse stability than those with intraosseous wire fixation and maxillomandibular fixation. Maxillary intermolar and interpremolar arch width relapses were not correlated with tongue interposition or loss of interdigitation. The relapse of these arch widths showed significant correlations with clockwise rotation of the mandible but not with changes of overbite or overjet.

Adolescent↗
PubMed1997

Skeletal and dento-alveolar stability of Le Fort I intrusion osteotomies and bimaxillary osteotomies in anterior open bite deformities. A retrospective three-centre study.

A sample of 267 patients with maxillary hyperplasia, a Class I or Class II/I occlusion and anterior vertical open bites, collected from three different institutions, was analysed regarding stability after surgical corrections. Skeletal and dento-alveolar stability of the maxilla, and positional changes of the mandible and of the incisors were evaluated. All patients underwent Le Fort I intrusion osteotomies and in 92 patients segmentation of the maxillae was performed. An additional bilateral sagittal split advancement osteotomy was performed in 123 patients. Intraosseous wire fixation was used in 153 patients and rigid internal fixation in 114 patients. Cephalometric radiographs were collected before orthodontic treatment, before surgery, immediately after surgery, one year postoperatively and at the latest follow up. The mean follow up was 69 months (range 20-210 months). It can be concluded that patients with anterior open bites, treated with a Le Fort I osteotomy in one-piece or in multi-segments, with or without bilateral sagittal split osteotomy, exhibited good skeletal stability of the maxilla. Rigid internal fixation produced the best maxillary and mandibular stability. The mean overbite at the longest follow up was 1.24 mm and a lack of overlap between opposing incisors was present in 19%. The overbite did not differ significantly between the different treatment procedures, probably due to compensatory movements of the mandibular and maxillary incisors.

Adolescent↗
PubMed1997

Cephalometric evaluation of dento-skeletal changes during treatment with the Bionator type 1.

Treatment effects of the Bionator functional appliance were studied on the pre- and post-treatment cephalograms of 49 Class II, Division 1 cases. After treatment, a significant more ventral localization of the anterior structures of the mandible was recorded in comparison with the pretreatment situation. The proclination of the maxillary incisors was reduced. No absolute inhibitory effect on maxillary growth was observed. In this study no significant differences in the measured treatment effects on cephalometric radiographs could be demonstrated in cases with a tendency to skeletal open bite from those with a tendency to skeletal deep bite according to the criteria used in this study.

Activator Appliances↗
PubMed1997

Contribution of interdigitation to the occlusal development of the dentition in Macaca fascicularis.

The contribution of interdigitation to the development of the dentition of juvenile Macaca fascicularis was studied on a series of dental casts and at the histological level by the use of vital staining. Fourteen laboratory-born monkeys were allocated to a control group (n = 7) or an experimental group (n = 7). They were followed from 31 to 152 weeks of age. In the animals of the experimental group, interdigitation was eliminated by gradually grinding the cusps of the molars and canines in both dental arches as soon as possible after emergence. Silicone impressions of the dental arches of each monkey were taken at regular intervals. Two experimental and two control animals received vital staining at regular intervals and were processed for histological evaluation at the end of the experimental period. Changes over time in the dimensions of the dentition were analysed. Locally, the maxillary dental arch in the experimental group broadened significantly faster than in the control group. No significant differences between the experimental and the control group were found for any of the mandibular parameters. The experimental intervention also led to less prevalence of anterior open bite in the experimental group than in the control group. It is concluded that interdigitation plays a role in the development of the maxillary dental arch and does not seem to affect mandibular dental arch development.

Animals↗
PubMed1996

The role of interdigitation in sagittal growth of the maxillomandibular complex in Macaca fascicularis.

The role of the interdigitation of posterior teeth in maxillomandibular growth and development was studied longitudinally in Macaca fascicularis monkeys. Fourteen monkeys were divided into a control group (n = 7) and an experimental group (n = 7). At the start of the study, the mean age of the animals was 29 weeks. At that stage the interdigitation in the experimental group was eliminated by grinding the cusps of the molars and canines. The animals were followed until 143 weeks of age and studied with the aid of tantalum implants and lateral radiographs. The findings indicated that elimination of the interdigitation resulted in a deviating anteroposterior relationship between the jaws and a significant inhibition of the vertical growth of the maxilla in the second half of the experimental period, while total face height was not noticeably affected. As a result, a more prognathic mandible and a more mesial occlusion developed. It can be concluded that the interdigitation plays a role in the regulation of vertical and anteroposterior facial growth and constitutes an important factor in the jaw relation in Macaca fascicularis monkeys.

Animals↗
PubMed1996

Occlusal and functional conditions after surgical correction of anterior open bite deformities.

The dental occlusion and alterations in orofacial muscles were studied in 267 patients whose severe anterior open bite had been treated with a Le Fort 1 intrusion osteotomy with or without an advancement sagittal split osteotomy about 6 years ago. Only 17% of those patients showed anterior contact, and 20% had no vertical overlap of mandibular and maxillary central incisors at all. Tongue position, activity of masticatory muscles, lip competence, lip-incisor relationship, and breathing mode were assessed. Statistically significant correlations were found between tongue positions and occlusion in both the anterior and the posterior regions. In addition, the activity of the masticatory muscles, habitual mouth posture, and interlabial distance were each significantly correlated to overbite, open bite, and overjet. The interlabial distance was also significantly correlated with both breathing mode and mentalis muscle activity. The activity of the masticatory muscles was negatively correlated with tongue position.

Adaptation, Physiological↗
PubMed1995

The role of intercuspation in the regulation of transverse maxillary development in Macaca fascicularis.

The role of intercuspation of the teeth in transverse maxillary growth and dental arch development was investigated radiographically with the aid of implants in Macaca fascicularis monkeys. Fourteen animals were randomly allocated to a control group (n = 7) and an experimental group (n = 7) and were followed from 29 to 100 weeks of age. Intercuspation was eliminated in the experimental group by grinding the canines and molar cusps in both dental arches as soon as possible after emergence. Maxillary occlusal radiographs were taken at regular intervals. Linear and angular analyses of skeletal changes revealed that midpalatal sutural growth seems to be independent of intercuspation. The developing dental arch, however, showed a significantly greater increase in width in certain areas in the experimental group than in the control group. Most findings support the hypothesis that the width of the maxillary dental arch is guided by the width of the mandible through the intercuspation of the posterior teeth.

Animals↗
PubMed1995

[Orthodontic possibilities for young patients with missing maxillary incisors].

In the orthodontic treatment of young patients with missing maxillary incisors one should make an effort to avoid prosthetic solutions. This not only applies to situations with agenesis of maxillary lateral permanent incisors, but also to those cases in which maxillary incisors cannot be maintained after trauma. Standard solutions are presented for various sagittal jaw relationships and types and number of teeth missing. Specific rules have to be observed for the closure of spaces due to missing teeth in order to reduce the occurrence of papillae retraction and to place the substituting teeth in such a position that their crowns can be built up to look like the originals. This requires mesiodistal angulations that deviate from the standard ones, a proper distribution of crown width and in most cases a permanent retention with a palatally bonded thin multistranded wire.

Anodontia↗
PubMed1995

[Front tooth replacement and the possible application of implants in young patients].

Oral implantology is a new treatment alternative and is often considered for treating the loss of teeth in patients of all ages. However, care has to be taken when using implants in younger patients, as implants in the growing patient can have considerable disadvantages. In this article indications, contra-indications and risks are discussed and an overview of conventional treatment alternatives is given. Finally, guidelines for the use of implants in children and adolescents are formulated.

Adolescent↗
PubMed1994

[Dental curriculum in Nijmegen].

The dental curriculum at the University of Nijmegen is based on what the dentist should know and be able to do after his graduation. The programme is divided up into cognitive, behavioural and motoric modules. These modules are vertically connected through subsequent course years by thematically related lines. For every module, the general objectives and general contents have been formulated. Moreover, all subcomponents have been specified as instructional objectives. Half of the study hours is reserved for practical dentistry, by means of preclinically laboratory courses or patient treatment. The curriculum is based on a scientific approach of dentistry and emphasis is placed on patient related instructional situations.

Curriculum↗
PubMed1992

[Anterior open bite].

In almost 50% of the Dutch population, the mandibular incisors do not contact the maxillary ones. An open bite is usually based on an interposition of the tongue and can be combined with other functional disturbances as digit sucking. A large open bite with an excessive facial deformity can be treated adequately, after facial growth is completed, by a combined orthodontic-surgical approach, in which a good cooperation between the orthodontist and the oral surgeon is essential. The correction of the facial deformity is of a permanent nature. That does not always apply to the open bite due to interposition of the tongue. Often it is not possible to arrive at complete contact by orthodontic or surgical means. The improvement realized can fade away partly in the years following.

Fingersucking↗
PubMed1992

Three years postgraduate programme in orthodontics. Final report Erasmus project.

A new curriculum with a common contents of 75%, leaving 25% for electives has been developed for a three year programme for specialty education in orthodontics. The result is a joint effort of the original eight participants and invited professors from Italy and Ireland as well as from five non-EEC countries (Austria, Finland, Norway, Sweden and Switzerland). Unanimity among the 15 participants was reached on all essential matters and on the contents of the final report. The main objective of the programme has been defined and the different courses have been formulated in terms of goals to be accomplished in three levels of comprehension and by the minimal hours students must devote to each subject. Furthermore, procedures that should be mastered have been specified.

Curriculum↗