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Biomedical subjects

J P Joho

Publications and source records attributed to J P Joho.

At least 19 recordsLinked to original sources
PubMed1997

Intra-alveolar surgical uprighting of impacted teeth: a case report.

Although orthodontic repositioning of impacted teeth is widely used, the treatment has its limitations. Autotransplantation or intra-alveolar surgical repositioning of teeth is an alternative therapy that may be used in selected cases of desperate impactions, when orthodontic extrusion is unsuccessful or when orthodontic treatment is rejected by the patient. A case report is presented to stress both the indications and limitations of a modified technique of intra-alveolar surgical uprighting of impacted teeth.

Alveolar Bone Loss↗
PubMed1995

A retrospective clinical and radiologic study of teeth re-implanted following traumatic avulsion.

Re-implantation is the recommended therapeutic procedure following traumatic exarticulation of teeth though its long-term prognosis remains controversial. The purpose of the following study was to evaluate the periodontal healing of 33 reimplanted incisors lost after trauma. The sample, which included 24 upper and 9 lower incisors, was divided in two groups: 15 teeth were reimplanted within 1 hour (=Group A) and 21 teeth after 3 hours or more (=Group B). The reimplanted teeth were followed for different radiographic evaluation periods up to 5 years (mean=2-9 years). The results showed a high rate of periodontal healing in Group A (66.7%), while Group B demonstrated a high percentage (83.3%) of both inflammatory and replacement resorption. Thus, even if the whole sample was prevented from drying before reimplantation, the teeth were affected by different rates of root resorption. Among the various prognostic factors suggested by the literature, bacterial contamination during extra-alveolar storage seemed the most critical.

Adolescent↗
PubMed1995

A new concept of education and knowledge retrieval through network systems.

Recent epidemiological investigations reveal increasing figures of prevalence of dental traumatology; however, basic and clinical research is rather scarce in the scientific literature. The development of computer technologies and the advent of communication pathways through network systems offer increased opportunities to disseminate theoretical and practical data on dento-facial traumatisms. A new server launched on Internet, the global network system, is described and proposed to allow better recognition and information sharing through both practitioners and institutions in the field of dental traumatology.

Computer Communication Networks↗
PubMed1994

Indications of autotransplantation of teeth in orthodontic problem cases.

Autotransplantations of teeth have been widely used in orthodontics, mainly in cases of severe impactions, early loss of permanent teeth, or congenital aplasia. In specific clinical situations, indication of extractions or supernumerary teeth may provide donor teeth for transplantations avoiding prosthetic or implant therapy. Two cases are presented to illustrate the topic, and prognostic factors of autotransplantation are discussed.

Anodontia↗
PubMed1994

Light maxillary expansion forces with the magnetic expansion device. A preliminary investigation.

An active maxillary magnetic expansion device (MED) was developed to be used clinically. The aim was to show the effects of light and continuous forces producing less traumatic stimulation of maxillary sutural growth than a conventional rapid maxillary expansion device. In this study, two different types of appliances were used on six patients between 7 years 4 months and 16 years 2 months: the first type was bonded, the other one used bands. For better appreciation, four implants were placed on each patient: two apically between central and lateral incisors, and two between second premolars and molars. A standardized radiographic technique was used to take occlusal radiographs, and postero-anterior and lateral headplates. The results varied according to the age and the appliance used. The skeletal effect with the banded MED was between 16 and 77 per cent, and for the bonded MED 0 and 25 per cent in comparison to the overall expansion. It seems that 250-500 g of continuous magnetic forces can produce dental and skeletal movements in a light force expansion concept, but further studies with larger samples are needed to make firm conclusions.

Activator Appliances↗
PubMed1994

A retrospective study of dento-alveolar injuries.

Traumatic injuries to primary and permanent dentition may lead to severe therapeutic problems. The purpose of the investigation was to evaluate epidemiologic data of dento-alveolar injuries collected in a university dental clinic. The sample consisted of 300 patients (198 boys, 102 girls) representing 480 injured teeth, mostly maxillary incisors (94.6%). The results pointed-out a high predominance of traumatized primary teeth. Types of injuries differed between deciduous and permanent dentition: luxation injuries were most often recorded in primary dentition (81%), while a high percentage of crown and crown-root fractures were recorded in permanent dentition (38%). Epidemiological observations concerning location, etiology and distribution of dento-alveolar injuries are briefly discussed.

Accidents, Home↗
PubMed1994

[Dental and dentoalveolar injuries: their etiology, incidence and distribution in a specialized university service].

From 1987 to 1992, 520 patients presenting with traumatic injuries were referred to the Department of Orthodontics and Pedodontics at the University of Geneva. The sample consisted of 949 injuries, involving 556 primary and 393 permanent teeth. They concerned mostly upper primary (56%) or permanent (35%) incisors, and were more frequent in boys (60.6%) than girls (39.4%). Various epidemiological observations concerning etiology, age distribution and seasonal variations are discussed. Given the limits assigned by data derived from a selected sample, they are compared with other studies dealing with traumatic injuries.

Adolescent↗
PubMed1993

Magnetic activator device II (MAD II) for correction of Class II, division 1 malocclusions.

A magnetically active, two-piece (upper and lower), functional orthopedic appliance has been developed, magnetic activator device (MAD) for the correction of Class II malocclusions. The magnetic forces are used to give freedom of mandibular movement and to allow for continuous functioning of the orofacial muscles when the appliance is worn. Samarium cobalt (Sm2Co17) magnets are incorporated on the buccal aspects of the upper and lower appliances. Magnetic forces ranging from 150 to 600 gm per side have been used on patients, and it seems that the skeletal versus dental response depends on the intensity of the magnetic force used. A force of 300 gm, when the magnets are in contact, on each side has been found to be an appropriate value in patients age 7 to 12 years. The use of this less bulky design rather than a traditional orthopedic appliance, along with the freedom of function it permits, has enabled patients to wear the appliance nearly 24 hours in most cases.

Activator Appliances↗
PubMed1993

A clinical and radiologic study of autotransplanted impacted canines.

The aim of the present study was to evaluate the clinical and radiologic results of 20 autotransplantations of impacted canines performed in the Orthodontic and Pedodontic Department of the University of Geneva between 1979 and 1988. The sample, divided into two different age groups (group A: 13-20 years; group B: 20-48 years), demonstrated persistence of pulp vitality in 80% of the cases in group A, whereas routine endodontic treatment was instituted in all cases of group B. Periodontal healing was noted in 90% of the cases in group A, and in 70% of the cases in group B. The present clinical and radiologic data indicate that impacted canines can be transplanted at any age with good prognosis and are an alternative to orthodontic repositioning in selected cases of canine impaction.

Adolescent↗
PubMed1993

Autotransplantations and loss of anterior teeth by trauma.

The loss of anterior teeth by trauma has usually been corrected by orthodontic or prosthetic means. In some specific cases, however, the skeletal and dental relationship may contraindicate the use of space-closure mechanics. Autotransplantation of teeth, successfully depicted in many clinical studies, can help to reduce the severity of orthodontic cases complicated by traumatized anterior teeth. A case report is presented to stress both the indications and limitations of such treatment.

Bicuspid↗
PubMed1992

Long-term clinical and radiologic evaluation of autotransplanted teeth.

The purpose of the present study was to investigate the radiologic results of 40 autotransplantations (20 molars and 20 premolars) performed in the orthodontic department of the University of Geneva between 1979 and 1990. The sample demonstrated persistence of pulp vitality and continuous root development, followed, however, in most cases by replacement root resorption. The data were in accordance with previously published studies and point to an ideal developmental stage for molar and premolar transplantation to ensure pulpal and periodontal survival.

Adolescent↗
PubMed1992

Severely impacted canines: autotransplantation as an alternative.

Although orthodontic repositioning of impacted teeth is widely used, the treatment has its limitations. Autotransplantation is an alternative therapy that may be used in selected cases of severe impaction or when orthodontic repositioning is unsuccessful. Two case reports are presented to illustrate the use of the technique in patients with severely impacted canines. Indications and limitations are discussed.

Child↗
PubMed1992

[The radiological evaluation of autotransplants].

The purpose of the present study was to investigate the radiological results of 40 autotransplantations (20 molars and 20 premolars) performed in the Orthodontic Department of the University of Geneva between 1979 and 1990. The sample demonstrated persistence of pulp vitality and continuous root growth, followed however in most cases by ankylosis and replacement root resorption. The data were in accordance with previous published studies and point out an ideal developmental stage for molar and premolar transplantation to ensure pulpal and periodontal survival.

Adolescent↗