ABSTRACT
OBJECTIVE: To evaluate and compare the eruption rates of lower second premolars (LPm2) at different developmental stages using cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Retrospectively, 31 individuals (9.77 ± 1.25 years) had their LPm2 scored according to the Demirjian method, and afterwards they were split into three groups according to developmental stage, as follows: D = complete-formed crowns; E = root length less than crown height; and F = root length greater than or equal to crown height. Linear distances from the LPm2 crown tip to the anatomical reference line (ARL) and to the occlusal plane line (OPL) were measured in paired CBCT scans (T1, T2), taken with an average interval of 8.6 months between them. Eruption rates (mm/y) were calculated and then compared between groups. RESULTS: Eruption rates were greater for LPm2 at stage F than at stages D or E (P < .01) regardless of whether they were measured from the ARL (D = 2.84 mm/y; E = 2.55 mm/y; F = 5.38 mm/y) or from the OPL (D = 1.82 mm/y; E = 2.02 mm/y; F = 5.26 mm/y). Eruption rates evaluated from the ARL and the OPL had no statistically significant differences (P = .052), and a positive correlation (r = .79, P < .001) between them was observed. CONCLUSIONS: LPm2 at Demirjian stage F showed greater eruption rates than at stages D or E, regardless of whether rates were measured from the ARL or the OPL. Faster eruption is expected for LPm2 at stage F. Evaluation of the LPm2's developmental stage using CBCT can aid in clinical decision making regarding the correct timing for intervention.
Subject(s)
Bicuspid/diagnostic imaging , Bicuspid/growth & development , Cone-Beam Computed Tomography , Tooth Eruption , Child , Female , Humans , Male , Mandible , Retrospective Studies , Tooth Crown/diagnostic imaging , Tooth Crown/growth & developmentABSTRACT
INTRODUCTION: Combined treatment offers advantages for partially edentulous patients. Conventional implants, used as orthodontic anchorage, enable previous orthodontic movement, which provides appropriate space gain for crown insertion. OBJECTIVE: This case report describes the treatment of a 61-year and 10-month-old patient with negative overjet which made ideal prosthetic rehabilitation impossible, thereby hindering dental and facial esthetics. CASE REPORT: After a diagnostic setup, conventional implants were placed in the upper arch to anchor intrusion and retract anterior teeth. Space gain for lateral incisors was achieved in the lower arch by means of an orthodontic appliance. CONCLUSIONS: Integrated planning combining Orthodontics and Implantology provided successful treatment by means of conventional implant-supported anchorage. The resulting occlusal relationship proved stable after 10 years.
Subject(s)
Dental Implants , Malocclusion, Angle Class III/therapy , Orthodontic Anchorage Procedures/instrumentation , Patient Care Team , Cephalometry/methods , Crowns , Dental Prosthesis, Implant-Supported , Dental Veneers , Diastema/therapy , Female , Follow-Up Studies , Humans , Jaw, Edentulous, Partially/rehabilitation , Middle Aged , Overbite/therapy , Patient Care Planning , Tooth Movement Techniques/instrumentationABSTRACT
INTRODUCTION: Combined treatment offers advantages for partially edentulous patients. Conventional implants, used as orthodontic anchorage, enable previous orthodontic movement, which provides appropriate space gain for crown insertion. OBJECTIVE: This case report describes the treatment of a 61-year and 10-month-old patient with negative overjet which made ideal prosthetic rehabilitation impossible, thereby hindering dental and facial esthetics. CASE REPORT: After a diagnostic setup, conventional implants were placed in the upper arch to anchor intrusion and retract anterior teeth. Space gain for lateral incisors was achieved in the lower arch by means of an orthodontic appliance. CONCLUSIONS: Integrated planning combining Orthodontics and Implantology provided successful treatment by means of conventional implant-supported anchorage. The resulting occlusal relationship proved stable after 10 years. .
INTRODUÇÃO: tratamentos combinados podem oferecer vantagens em casos de edentulismo parcial. O uso de implantes convencionais como ancoragem ortodôntica permite a movimentação ortodôntica prévia, fornecendo os espaços apropriados para inserção das coroas. OBJETIVO: este relato de caso descreve o tratamento de uma paciente, com 61 anos e 10 meses de idade, que possuía um overjet negativo que tornava impossível uma reabilitação protética ideal, comprometendo a estética dentária e facial. RELATO DO CASO: após um setup diagnóstico, os implantes convencionais foram colocados na mandíbula para ancorar a intrusão e retração dos dentes anteriores. Espaços para os incisivos laterais foram abertos na maxila, usando-se aparelho ortodôntico. CONCLUSÕES: o planejamento integrado entre Ortodontia e Implantodontia propiciou um tratamento bem-sucedido, usando implantes convencionais como ancoragem. A relação oclusal obtida apresenta estabilidade 10 anos pós-tratamento. .
