Treatment of a Class III malocclusion with a missing mandibular incisor and severe crowding

This case was chosen for publication by the CDABO student case selection committee. (Am J Orthod Dentofacial Orthop 1999;116:661-6)     

Treatment of a Class I crowded malocclusion with an ankylosed maxillary central incisor.

This article describes a Class I crowded malocclusion with an ankylosed maxillary central incisor that was in infraocclusion and labially displaced. Various treatment alternatives are discussed, and the option of extracting the ankylosed tooth followed by space closure with lateral incisor substitution is developed.     

Treatment of a Class I malocclusion with a carious mandibular incisor and no Bolton discrepancy.

Occasionally orthodontists must plan treatment for a patient with extensive caries or a traumatic injury to one mandibular incisor. If the patient has a Bolton discrepancy, one treatment option could involve extraction of the affected mandibular incisor. However, if the patient does not have a Bolton discrepancy and a mandibular incisor is extracted, the treatment becomes more complicated. This case report will present and discuss the ramifications of extracting one mandibular incisor in a patient without an anterior tooth-size discrepancy. The CDABO Student Case Selection Committee chose this case for publication.     

Treatment of a congenitally missing upper lateral incisor with an implant

The presentation of a case where an agenetic lateral tooth was replaced by an oral implant, has been described. The following parameters are important: oral hygiene, the moment of implant surgery, presurgical orthodontic treatment, alternative prosthetic treatment possibilities and recall of the patient.     

Orthodontic treatment of a congenitally missing maxillary lateral incisor

Clinicians agree that, regardless of gender or race, tooth agenesis has become more prominent in recent societies. The congenital absence of one or more maxillary lateral incisors poses a challenge to effective treatment planning for the restorative dentist. However, the one-sided orthodontic approach of just moving canines mesially to eliminate restorative procedures leads to compromise. Adult patients presenting with malocclusions, missing lateral incisors, or anterior crowding but who fail to get proper orthodontic treatment, requesting instead esthetic solutions that do not establish a stable occlusion, proper alignment, and proper axial inclination of the teeth will have compromised esthetic and periodontal results. An evaluation of anterior smile esthetics must include both static and dynamic evaluations of frontal and profile views to optimize both dental and facial appearance. This article presents how orthodontics is combined with other specialties in treating a congenitally missing lateral incisor. One case is used to illustrate how orthodontic treatment is progressed in collaboration with other specialists. CLINICAL SIGNIFICANCE: Patients with missing teeth, crowding, midline deviation, unesthetic gingival contours, or other restorative needs may require the interaction between various specialists. For the successful treatment of orthodontic-restorative patients, an interdisciplinary team effort is vital.     

Treatment of a patient with a Class I malocclusion with bialveolar protrusion, mild upper and lower crowding, and mild mandibular prognathism.

This case report was presented to the American Board of Orthodontics in partial fulfillment of the requirements for the certification process conducted by the Board. (Am J Orthod Dentofacial Orthop 2000;117:453-8)     

Clinical management of the congenitally missing maxillary lateral incisor and mandibular second premolar: a clinical perspective

The decision to close maintain, or open space at the agenesis sites of the maxillary lateral incisor and mandibular second premolar is generally based on several factors, including the class of malocclusion, skeletal pattern (divergence), esthetics, function, and periodontics. Replacement of congenitally missing maxillary lateral incisors, the second most commonly missing teeth, can involve (1) canine replacement, (2) tooth-supported restoration, and (3) implants. This paper contrary to the opinion of other authors, favors replacement of the congenitally missing lateral incisors in one of several ways, versus orthodontic space closure.     

62例伴先天缺牙错畸形的正畸治疗临床分析

目的回顾性总结分析伴有先天缺牙的错畸形患者先天缺牙的部位、类型和矫治方法。方法选择结束治疗的正畸患者中伴有先天缺牙者62例,对缺牙数目、部位、类型和矫治方法进行总结分析。结果缺牙部位最常见的是下颌中切牙、上颌侧切牙和下颌侧切牙,以少数牙缺失为主,女性多于男性。7例替牙期患者行一期矫治,恒牙列中23例结合拔牙减数,19例行集中间隙、结合义齿修复,10例结合邻面去釉减径,2例行前移后牙替代的方法进行矫治,矫治结果满意。结论对伴有先天缺牙的错畸形,替牙期先行一期矫治后观察,恒牙期根据缺牙数目、部位、类型及错采用结合减数、减径或集中间隙修复的方法均可获得满意的矫治效果。     

Changes in mandibular incisor position in Class II Division 1 malocclusion treated with premolar extractions

The aim of this study was to investigate the magnitude of mandibular incisor retraction to be expected during full fixed appliance mechanotherapy in Class II Division 1 malocclusions treated with premolar extractions when mandibular incisor retraction was not part of the treatment plan. The material consisted of pretreatment and posttreatment cephalometric films and dental casts of 70 Class II Division 1 malocclusion patients (33 males and 37 females) treated with the preadjusted edgewise appliances. The mandibular first premolars were extracted in 31 subjects, and the mandibular second premolars were extracted in 39. The pretreatment factors that suggested a basis for the extraction choice in the mandibular arch in these patients were found to include the ratio between posterior and anterior facial heights, the maxillary-mandibular plane angle, and the residual space in the mandibular arch. The mandibular incisors were retracted in only 65% of the patients. On average, the mandibular incisors were retracted by 1.02 mm relative to the nasion-pogonion line; there was no significant difference between the 2 extraction groups. Multiple regression analysis showed that the change in the mandibular incisor position is significantly correlated with the residual space in the mandibular arch, the initial distance between the mandibular incisor and the nasion-pogonion line, maxillary-mandibular angle, and the duration of crown labial torque in the mandibular incisors. In combination, these 4 factors could explain 61% of the change in the mandibular incisor position.