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Results for “SPACE MAINTENANCE”

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At least 289 records · Page 16Linked to original sources
PubMed2001

Implant-osseous osteotomy for correction of the misaligned anterior maxillary implant.

The trend has been to use angled abutments to compensate for implants that have poor emergence profiles. This trend has resulted in increasing unfavorable forces being placed on the implant, poor soft tissue emergence and contours, or creation of areas that the patient cannot maintain properly. The end results are an esthetic compromise and ultimately implant failure. This case illustrates that a misplaced or misaligned integrated implant can be repositioned successfully within the maxillary alveolus. Careful treatment planning, flap design, and soft tissue manipulation must be considered to maintain the vascularity and integration within the implant-osseous segment as well as the soft tissue. The byproduct of maintaining vascular integrity is normal soft tissue morphology, especially of the interdental papillae (see Fig. 6).

Adolescent↗
PubMed1998

Manned interplanetary missions: prospective medical problems.

The present review aimed to suggest approaches to prospective medical problems related to the health maintenance of space crews during future manned interplanetary, particularly Martian, missions up to 2-3 years with a possible stay on a planet with gravity different from that on Earth. The approaches are based on knowledge so far obtained from our analysis of the medical support of long-term orbital flights up to one year, as well as on the consideration of specific conditions of interplanetary missions. These specific conditions include not only long-term exposure to microgravity, but also a prolonged stay of unpredictable duration (2-3 years) on board a spacecraft or on a planet without direct contact with Earth, and living in a team with a risk of psychological incompatibility and the impossibility of an urgent return to Earth. These conditions necessitate a highly trained medical person in the crew, diagnostic tools and equipment, psychophysiological support, countermeasures, as well as the means for urgent, including surgical, treatment on board a spacecraft or on a planet. In this review, the discussion was focused on the following predictable medical problems during an interplanetary mission; 1) unfavorable effects of prolonged exposure to microgravity, 2) specific problems related to Martian missions, 3) medical monitoring, 4) countermeasures, 5) psychophysiological support and 6) the medical care system.

Adaptation, Physiological↗
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↗
PubMed2000

Space for missing maxillary lateral incisors--orthodontic perceptions.

Historically there has been a long-standing debate regarding the orthodontic management of dentitions with missing maxillary lateral incisors. Whether to provide space for prosthetic replacements or to close space utilizing the canines as substitute lateral incisors are the options of treatment planning for an individual. This presentation is directed at the orthodontic management of those patients who were orthodontically treated in the past by providing space for replacement lateral incisors and now at dental maturity or even later, seek a prosthetic replacement in the form of an osseointegrated fixture. In many instances there will be inadequate interradicular bone space and yet at the time of debanding adequate space often was present and now some years hence the patient is faced with orthodontic re-treatment to provide that space again. Whilst that is a challenge in itself, there is a further apparent problem to be met for those younger patients requiring space opening mechanics in deciding upon and implementing at the debanding phase, the form of retention that will hold the teeth and the roots firmly in position until the time is right for an osseointegrated fixture to be placed and treatment finalized.

Adolescent↗
PubMed2000

Missing upper lateral incisors: orthodontic considerations in young patients.

Missing lateral incisors are usually discovered by age 9 when general orthodontic treatment needs are becoming apparent. Whether to close, open or maintain a space for a missing lateral incisor is an orthodontic decision that needs to fit within a total plan of dental management. Factors to consider include:- Skeletal base relationship, severity of crowding, overjet, overbite, position into which the canine erupts, crown sizes, crown shapes, crown colours, gingival contours, gingival display on smiling, patient and parent attitude toward options, availability of appropriate prosthetic services, time delay before effecting "final" prosthetic treatment, space and bone required for implant fixtures and financial and biological costs.

Anodontia↗
PubMedDate not supplied

The treatment and long-term management of severe multiple avulsions of primary teeth in a 19-month-old child.

Traumatic injury to the primary dentition is a common occurrence in young preschoolers. The maxillary incisors and, more specifically, the central incisors, are the most commonly injured teeth. The purpose of this article is to present the immediate and long-term treatment and management of a severe case of multiple avulsions involving all maxillary incisors and canines and the right first primary molar in a 19-month-old child, due to trauma. Esthetic, functional and orthodontic considerations are discussed.

Accidental Falls↗
PubMed2001

The esthetic space maintainer.

This article describes why it is important to replace the maxillary primary incisors when they are prematurely lost in children. The consequences of not replacing these teeth in relation to speech, esthetics, and self-image considerations are provided. A step-by-step description is presented for the fabrication of an esthetic appliance, which can be easily made to replace missing maxillary primary incisors. In addition, information is presented on when and how to remove the esthetic appliance.

Child↗
PubMed2001

Chairside prefabricated fiber-reinforced resin composite fixed partial dentures.

The introduction of pre-impregnated fiber-reinforced resin composites has provided the dental profession with the opportunity to fabricate and deliver adhesive, esthetic, and metal-free tooth replacements. Utilizing this technology, a prefabricated fiber-reinforced resin composite fixed partial denture prototype that allows rapid, cost-effective, and noninvasive fixed tooth replacement for single anterior teeth has been developed. Ideal situations for this type of service include: a fixed replacement following tooth loss from trauma; a fixed tooth replacement in medically compromised patients who cannot sit for extended periods of time or have local anesthesia; periodontally compromised abutments; a fixed space maintainer following orthodontic movement; and a fixed provisional during the post implant healing phase prior to loading. This article describes the framework construction and placement protocol for the prefabricated fiber-reinforced resin composite fixed partial denture.

Composite Resins↗
PubMed2002

Case report: orthodontic separators as periodontal ligatures in periodontal bone loss.

Periodontal destruction due to subgingival elastic bands was first reported in the dental literature nearly 130 years ago, and has involved over 20 cases. Destruction due to orthodontic separators used during fixed appliance therapy is a less common occurrence. A case report is presented which illustrates the severe periodontal destruction, which can occur when separators are misused. The subsequent treatment of this problem is also described. Emphasis is placed on the correct use of these orthodontic adjuncts and, appropriate monitoring of the gingival health of orthodontic patients.

Adolescent↗
PubMed2002

Orthodontic treatment of palatally impacted maxillary canines.

The aim of this study was to determine the feasibility of treating children with impacted maxillary canines by orthodontic treatment alone. The subjects were 28 children (mean age: 13.5 years, range 11.4-16.1 years) with between them 32 palatally impacted canines. The overlying primary canines were extracted between 0 and 42 months before the start of appliance treatment to open space in the arches for the impacted teeth. No other surgical procedures were carried out prior to the start of appliance treatment. Appliance treatment was deferred for at least six months if an impacted canine was the main reason for treatment, otherwise treatment was commenced according to the needs of the patient. In 94% of the cases, the severity of impaction lessened following extraction of the overlying primary canines and orthodontic treatment. The deepest impactions tended to occur in the oldest children. The majority (75%) of the canines emerged following orthodontic treatment to create space for them in the arch; the remainder were surgically exposed. Appliance treatment tended to take longer in children with the deepest impactions. It is concluded that fixed appliance treatment to create space for a palatally impacted canine is an effective management option for children with impacted maxillary canines.

Adolescent↗
PubMedDate not supplied

Clinical performance and survival of space maintainers: evaluation over a period of 5 years.

The study investigated the clinical performance of 387 space maintainers fitted in 358 patients aged from 3 to 9 years in the Department of Pediatric Dentistry at the Faculty of Dentistry-University of Jordan from 1996 to 2000. Failure occurred in 119 appliances (30.7%), of which 49.6% were due to solder breakage, 32.8% from cement loss, 11% from soft tissue lesions, 4.2% from eruption interference, and 2.5% were completely lost. By using the Kaplan-Meier method, the estimated median survival time for space maintainers was 18 months. Lingual arches had the lowest median survival time of 14 months. Bands and loops, Nance appliances, and removable partial dentures had similar probability of survival. Fixed bilateral mandibular appliances recorded lower survival time than fixed bilateral maxillary appliances. Gender, age, type of dentition, fixed vs. removable, year of placement of the appliance and number of space maintainers fitted simultaneously in the same patient had no significant effect on survival of the appliances.

Chi-Square Distribution↗
PubMedDate not supplied

The distal shoe space maintainer chairside fabrication and clinical performance.

The chairside-fabricated distal shoe appliance, with a stainless steel crown as the retainer, is an efficacious and cost-effective appliance for guiding the unerupted permanent first molar into position after premature loss or extraction of the second primary molar. The fabrication technique is illustrated in this case report and data is presented on the success rate of the appliance.

Child↗
PubMed2000

[The design, functions and clinic applications of lip bumper].

OBJECTIVE: This paper introduced the principle of design, methods of fabrication, indications and functions of lip bumper, and advocated the application of lip bumper in orthodontic clinic. METHODS: Two typical cases treated with lip bumper were introduced. Some notices and experiences of applying lip bumpers were summed up. RESULTS: There were following functions of lip bumper: as a space maintainer, Fränkel effect, headgear effect, post-maxillary expansion retention, derotation of molars, and combined using with headgear. CONCLUSION: The advantages of lip bumper are inclusions of a wide range of indication, wearing for 24 hours per day, easily fabricating and prefabricating, comfortable and hidden for patients.

Child↗