ABSTRACT
INTRODUCTION: Symmetric transverse expansion is the main outcome of the early treatment in subjects with unilateral functional posterior crossbite. The aim of this study was to analyse mesial rotation and mesialization of upper first molars as sagittal parameters to be corrected in the treatment of these patients during the mixed dentition. METHODS: Digital dental cast measurements (rotation and mesialization) were performed in a sample of 48 subjects with unilateral posterior crossbite (UPXB; 19 males and 29 females, mean age 10.2 ± 1.2 years) and in a control group of 35 subjects with normal Class I occlusion (17 males and 18 females, mean age 9.9 ± 1.3 years). An independent sample t-test, the Mann-Whitney test, Fisher's exact test, and Pearson correlation were used for statistical comparison. RESULTS: The amount of upper molar rotation was significantly greater in the experimental group when compared with the control group. A clinically significant 'upper molar rotation' (UMR) was present in 66.7 per cent of the subjects with UPXB versus 5.7 per cent of the control group. The UMR group presented also a significant mesialization of upper first molars when compared with the control group. In the experimental group, there was a significant difference between rotation and mesialization in the right and left side and a correlation has been found between these two variables and the amount of Class II molar relationship at the crossbite side. LIMITATIONS: This is an epidemiological case-control study and the discussed effects of an early correction of the asymmetric upper molars' migration are only speculations based on an association relationship. CONCLUSIONS: The findings of this study show an asymmetric upper first molars' migration (rotation and mesialization) in unilateral functional posterior crossbite versus a control group. An early evaluation and correction of the molars' migration during the mixed dentition should be considered in order to obtain a correct inter-occlusal sagittal molar relationship, space for an adequate eruption of permanent teeth, and perhaps reduce the need of a following fixed appliance treatment in the permanent dentition.
Subject(s)
Malocclusion/complications , Mesial Movement of Teeth/etiology , Molar/physiopathology , Adolescent , Case-Control Studies , Child , Dental Casting Technique , Dentition, Mixed , Dentition, Permanent , Female , Humans , Male , Malocclusion/physiopathology , Malocclusion/therapy , Mesial Movement of Teeth/physiopathology , Mesial Movement of Teeth/therapy , RotationABSTRACT
This article highlights the use of two new design space regainers--the "lingual arch crossbow" and the "double-banded space regainer." The former may be used for distalizing a mesially migrated mandibular first premolar, if it erupts prior to the canine. The latter may be used in conventional cases of interdental space loss. They both contain assemblies that function through the action of NiTi open coil springs.
Subject(s)
Mesial Movement of Teeth/therapy , Orthodontic Appliance Design , Orthodontic Wires , Space Maintenance, Orthodontic/instrumentation , Tooth Movement Techniques/instrumentation , Child , Elasticity , Humans , Male , Nickel , TitaniumABSTRACT
UNLABELLED: Ectopic eruption of the first permanent molar is a relatively common occurence in the developing dentition. A range of treatment options are available to the clinician provided that diagnosis is made early. Non-treatment can result in premature exfoliation of the second primary molar, space loss and impaction of the second premolar. This paper will describe the management of ectopic first permanent molars, using clinical examples to illustrate the available treatment options. CLINICAL RELEVANCE: This paper is relevant to every general dental practitioner who treats patients in mixed dentition.
Subject(s)
Malocclusion/etiology , Orthodontic Wires , Tooth Eruption, Ectopic/therapy , Tooth, Impacted/therapy , Child , Humans , Malocclusion/therapy , Mesial Movement of Teeth/etiology , Mesial Movement of Teeth/therapy , Molar , Recurrence , Tooth Eruption, Ectopic/complications , Tooth, Impacted/complicationsABSTRACT
Second molars can create great delays in orthodontic treatment if they are not managed intelligently. The purpose of this article was to describe common torque and position problems of the second molars and techniques for managing them. A simple technique for freeing mesially impacted second molars is presented.
Subject(s)
Mesial Movement of Teeth/therapy , Molar/pathology , Tooth Movement Techniques/methods , Tooth, Impacted/therapy , Humans , Mandible , Maxilla , Molar, Third/surgery , Orthodontic Wires , Tooth Movement Techniques/instrumentation , TorqueABSTRACT
Lack of adequate mesiodistal space and/or incorrect implant placement may not provide adequate space for the fabrication, insertion, and maintenance of implant crowns. This report describes the clinical presentation of a patient requiring restoration of a dental implant without adequate interproximal space due to mesial drift of the adjacent tooth. Orthodontic tooth movement was achieved with an osseointegrated dental implant and orthodontic elastics.
Subject(s)
Crowns , Dental Implants, Single-Tooth , Dental Prosthesis, Implant-Supported , Jaw, Edentulous, Partially/complications , Mesial Movement of Teeth/therapy , Tooth Movement Techniques/methods , Adult , Elastomers , Female , Humans , Mandible , Mesial Movement of Teeth/complications , MolarABSTRACT
Mesiodens is the most common type of supernumerary tooth found in the premaxilla. It might be discovered by the orthodontist by chance on a radiograph or as the cause of an unerupted maxillary central incisor. The genetic transmission of supernumerary and impacted teeth is poorly understood. The occurrence of identical unerupted maxillary central incisors and mesiodentes in monozygotic twins suggests that genetic factors might influence the etiology of this problem. In this case report, we discuss the treatment of unerupted maxillary permanent incisors caused by mesiodentes in monozygotic twins.
Subject(s)
Diseases in Twins , Incisor/pathology , Mesial Movement of Teeth/therapy , Tooth, Supernumerary/genetics , Tooth, Unerupted/genetics , Twins, Monozygotic , Cephalometry , Child , Humans , Male , Maxilla , Mesial Movement of Teeth/etiology , Orthodontic Extrusion , Tooth Extraction , Tooth, Supernumerary/complications , Tooth, Supernumerary/surgery , Tooth, Unerupted/etiology , Tooth, Unerupted/therapyABSTRACT
Distalization of maxillary molars is indicated for correction of Class II dental malocclusion and for space gain in cases of space deficiency. The ideal treatment with an intraoral fixed appliance for molar distalization should fulfill the following requirements: patient compliance; acceptable esthetics; comfort; minimum anterior anchor loss (as evidenced by inclination of incisors); bodily movement of the molars to avoid undesirable effects and unstable outcomes; and minimum time required during sessions for placement and activations. The purpose of this paper was to present an alternative treatment for space recovery in the area of the maxillary right second premolar when there has been significant mesial movement of the permanent maxillary right first molar. We used a modified appliance that allows unilateral molar distalization in cases of unilateral tooth/arch size discrepancy using the opposite side as anchor, thus reducing the mesialization of the anterior teeth.
Subject(s)
Malocclusion, Angle Class II/therapy , Mesial Movement of Teeth/therapy , Molar/physiopathology , Orthodontic Appliance Design , Tooth Loss/complications , Tooth Movement Techniques/instrumentation , Cephalometry , Child , Dentition, Mixed , Humans , Male , Mesial Movement of Teeth/etiology , Space Maintenance, Orthodontic , Tongue Habits , Tooth EruptionABSTRACT
Adolescents with congenitally missing lateral incisors require an interim space maintainer to restore function and esthetics before craniofacial growth is complete and an endosseous implant can be placed. This article presents 2 patients, each with a missing lateral incisor, who underwent orthodontic therapy. A chairside, prefabricated fiber-reinforced composite bridge was used as a fixed space maintainer after the appliances were removed.
Subject(s)
Anodontia/rehabilitation , Denture, Partial, Fixed, Resin-Bonded , Incisor/abnormalities , Orthodontic Retainers , Space Maintenance, Orthodontic/instrumentation , Adolescent , Dental Implants, Single-Tooth , Female , Humans , Maxilla , Mesial Movement of Teeth/therapy , Patient Care Planning , Tooth Movement TechniquesABSTRACT
Se presenta una paciente de 35 años y 6 meses con relación molar-canina de clase 11, resalte horizontal aumentado, apiñamiento severo y diagnosticada de enfermedad periodontal severa (AU)
No disponible
Subject(s)
Humans , Female , Adult , Periodontal Diseases/complications , Malocclusion/complications , Orthodontics, Corrective/methods , Mesial Movement of Teeth/therapy , Esthetics, DentalABSTRACT
No disponible
Subject(s)
Humans , Female , Adult , Mesial Movement of Teeth/therapy , Periodontal Diseases/therapy , Malocclusion/therapy , Orthodontics, Corrective/methods , Esthetics, DentalABSTRACT
OBJECTIVE: After localized space closure in the mandible it is desirable to preserve lower wisdom teeth as natural replacements for missing second premolars and as antagonists for upper second molars. The aim of this study was to determine whether this treatment method can obviate the need for prosthodontic restorations, implants, and third molar osteotomy. Furthermore the time point of possible third molar eruption was to be determined and whether further orthodontic interventions were required to achieve their alignment. PATIENTS AND METHODS: The test group comprised 34 patients who exhibited agenesis of one or both lower second premolars (n = 45) in conjunction with a corresponding number of third molar tooth germs. Follow-up examinations were performed 2 to 8 years after conclusion of orthodontic treatment involving push-and-pull mechanics (PPM) without extraction of any contralateral teeth. The results of the clinical retrospective follow-up examination at consecutive post-treatment endpoints were compared with two orthodontic control groups (A: 4-premolar extraction group, B: non-extraction group). RESULTS: After an average of 4 years and 2 months, the percentage of fully-erupted third molars in the agenesis group with localized space closure was 82%, compared to 29% and 28%, respectively, in the controls. These differences were statistically significant (p < or = 0.01). The success rate in the agenesis group reached 94% when the 4- to 8-year results were considered in isolation. Compared with the contralateral (non-aplastic) side, teeth on the aplastic side erupted prematurely. In 9% of the cases, minor orthodontic interventions were required to exactly position the third molars. CONCLUSION: There is high probability that mandibular third molars can be preserved after localized space closure, obviating the need for prosthodontic restorations, dental implants, and third molar osteotomies.
Subject(s)
Anodontia/therapy , Bicuspid/abnormalities , Mesial Movement of Teeth/therapy , Molar , Orthodontic Space Closure/methods , Tooth Eruption, Ectopic/prevention & control , Tooth Eruption , Adolescent , Adult , Anodontia/diagnosis , Female , Humans , Male , Mesial Movement of Teeth/complications , Molar, Third , Retrospective Studies , Tooth Eruption, Ectopic/etiology , Treatment OutcomeABSTRACT
Loss of space in the mandibular arch is a common occurrence due to several different causes such as caries, trauma or iatrogenic damage. This paper describes a new TMA spring used in mixed dentition for space regaining in the mandibular arch. A clinical report is presented and the advantages of the method are discussed.
Subject(s)
Mesial Movement of Teeth/therapy , Orthodontic Appliances , Tooth Movement Techniques/instrumentation , Cephalometry , Child , Dental Arch/pathology , Dentition, Mixed , Humans , Male , Mandible , Orthodontic Appliance Design , Space Maintenance, OrthodonticABSTRACT
This article describes 2 patient treatments in which a simple technique was used to realign teeth before restorative procedures. Elastic separators were used to tip the desired tooth into its original position. This restored a normal crown contour and improved the tooth's long-axis alignment. The procedure is simple and inexpensive, and treatment time relatively quick compared with other orthodontic procedures.
Subject(s)
Dental Restoration, Permanent/methods , Orthodontic Appliances , Tooth Movement Techniques/methods , Bicuspid/pathology , Crowns , Cuspid/pathology , Dental Restoration Failure , Dental Restoration, Temporary , Denture, Partial, Fixed , Follow-Up Studies , Humans , Mesial Movement of Teeth/therapy , Post and Core Technique , Tooth Movement Techniques/instrumentationABSTRACT
This clinical case describes a new orthodontic/surgical concept for immediate loading of hydroxyapatite-coated cylindric implants, placed at the end of orthodontic treatment, to restore a traumatically lost maxillary central incisor. Further clinical and histologic studies are necessary to promote routine clinical application of this technique.
Subject(s)
Dental Implantation, Endosseous/methods , Dental Implants, Single-Tooth , Incisor/injuries , Mesial Movement of Teeth/therapy , Tooth Avulsion/surgery , Tooth Movement Techniques/methods , Adolescent , Denture, Partial, Immediate , Humans , Male , Maxilla , Mesial Movement of Teeth/etiology , Tooth Avulsion/complications , Tooth Avulsion/rehabilitationABSTRACT
BACKGROUND: Orthodontic molar uprighting often results in extrusion of the molar, which is not always beneficial. The authors present a strategy for accomplishing molar uprighting without extrusion. DESCRIPTION OF THE PROCEDURE: The authors review and compare the benefits of molar uprighting with and without extrusion. The helical uprighting spring is probably the most popular appliance used for molar uprighting. It exerts an extrusive force on the molar during uprighting. The authors explain why this appliance produces an extrusive force and present a strategy to modify the appliance so that it can be used to upright without extrusion. CLINICAL IMPLICATIONS: The information presented in this article should help the dental practitioner select a suitable appliance, understand how it works and use it appropriately so that molar uprighting can be achieved without extrusion of the molar.
Subject(s)
Mesial Movement of Teeth/therapy , Molar/physiopathology , Orthodontic Wires , Tooth Movement Techniques/instrumentation , Dental Stress Analysis , Elasticity , Humans , Tooth Movement Techniques/methodsABSTRACT
This article is intended to give an overview of mandibular second premolar impactions and a detailed description of treatment. Practitioners who possess a basic knowledge of oral surgery technique and comprehensive corrective orthodontic capabilities could successfully treat such an entity.
Subject(s)
Mesial Movement of Teeth/therapy , Tooth, Impacted/therapy , Bicuspid/pathology , Child , Humans , Male , Mandible , Mesial Movement of Teeth/etiology , Orthodontics, Corrective , Tooth, Impacted/complications , Tooth, Impacted/surgeryABSTRACT
Incontinentia pigmenti is an uncommon genodermatosis that occurs in female infants. The characteristic dental defects are partial anodontia and the presence of some peg-shaped teeth. This report describes a patient with incontinentia pigmenti who exhibited multiple missing teeth in both arches. The patient had malpositioned teeth and decreased occlusal vertical dimension associated with the missing teeth. Orthodontic treatment was required for prosthetic purposes. The dental anomalies of incontinentia pigmenti and the treatment procedure are presented.
