Economic analysis to promote the resource circulation of end-of-life vehicles in Korea.

This study explores how Korea's ELV recycling policy can be improved to meet the targeted ELV recycling rate by reviewing the characteristics of the recycling policies adopted in Korea and abroad and conducting an economic analysis of each step of the ELV recycling process, namely, dismantling (including waste gas treatment), shredding, and ASR recycling. The costs and revenues of each ELV treatment process was computed using the data from operators in Korea to estimate their economic feasibility. The findings indicated that, in the case of Korea, dismantling accounted for the largest portion of the ELV recycling process, pointing to the need for policies providing financial support to ELV dismantlers to enhance the overall ELV recycling rate. At the post-dismantling stage, it was found that greater attention to the ELV shredding stage and diversifying the treatment methods for recycled automotive shredder residue (ASR) can be valid measures to reduce Korea's current reliance on dismantling. However, institutional or financial support will be essential to assist with the initial investment costs for developing ASR treatment technologies and constructing new facilities.

Miniscrew-assisted rapid palatal expansion for managing arch perimeter in an adult patient.

INTRODUCTION:: Etiology of dental crowding may be related to arch constriction in diverse dimensions, and an appropriate manipulation of arch perimeter by intervening in basal bone discrepancies cases, may be a key for crowding relief, especially when incisors movement is limited due to underlying pathology, periodontal issues or restrictions related to soft tissue profile. OBJECTIVES:: This case report illustrates a 24-year old woman, with maxillary transverse deficiency, upper and lower arches crowding, Class II, division 1, subdivision right relationship, previous upper incisors traumatic episode and straight profile. A non-surgical and non-extraction treatment approach was feasible due to the miniscrew-assisted rapid palatal expansion technique (MARPE). METHODS:: The MARPE appliance consisted of a conventional Hyrax expander supported by four orthodontic miniscrews. A slow expansion protocol was adopted, with an overall of 40 days of activation and a 3-month retention period. Intrusive traction miniscrew-anchored mechanics were used for correcting the Class II subdivision relationship, managing lower arch perimeter and midline deviation before including the upper central incisors. RESULTS:: Post-treatment records show an intermolar width increase of 5 mm, bilateral Class I molar and canine relationships, upper and lower crowding resolution, coincident dental midlines and proper intercuspation. CONCLUSIONS:: The MARPE is an effective treatment approach for managing arch-perimeter deficiencies related to maxillary transverse discrepancies in adult patients.

Miniscrew-assisted rapid palatal expansion for managing arch perimeter in an adult patient

ABSTRACT Introduction: Etiology of dental crowding may be related to arch constriction in diverse dimensions, and an appropriate manipulation of arch perimeter by intervening in basal bone discrepancies cases, may be a key for crowding relief, especially when incisors movement is limited due to underlying pathology, periodontal issues or restrictions related to soft tissue profile. Objectives: This case report illustrates a 24-year old woman, with maxillary transverse deficiency, upper and lower arches crowding, Class II, division 1, subdivision right relationship, previous upper incisors traumatic episode and straight profile. A non-surgical and non-extraction treatment approach was feasible due to the miniscrew-assisted rapid palatal expansion technique (MARPE). Methods: The MARPE appliance consisted of a conventional Hyrax expander supported by four orthodontic miniscrews. A slow expansion protocol was adopted, with an overall of 40 days of activation and a 3-month retention period. Intrusive traction miniscrew-anchored mechanics were used for correcting the Class II subdivision relationship, managing lower arch perimeter and midline deviation before including the upper central incisors. Results: Post-treatment records show an intermolar width increase of 5 mm, bilateral Class I molar and canine relationships, upper and lower crowding resolution, coincident dental midlines and proper intercuspation. Conclusions: The MARPE is an effective treatment approach for managing arch-perimeter deficiencies related to maxillary transverse discrepancies in adult patients.

RESUMO Introdução: a etiologia do apinhamento dentário pode estar relacionada à constrição das arcadas dentárias em diversas dimensões, e a manipulação apropriada do perímetro da arcada, por meio da intervenção em casos de discrepâncias de base óssea, pode ser o fator chave para a dissolução do apinhamento, especialmente em casos onde a movimentação de incisivos é limitada em decorrência de problemas periodontais ou restrições relacionadas ao perfil facial. Objetivos: o presente relato de caso ilustra uma paciente de 24 anos de idade, com deficiência transversa de maxila, apinhamento das arcadas superior e inferior, má oclusão de Classe II, 1a divisão, subdivisão direita, incisivos superiores previamente traumatizados e perfil reto. A abordagem de tratamento não-cirúrgica e sem extrações foi viável devido à técnica de expansão rápida da maxila assistida por mini-implantes (MARPE, do inglês miniscrew-assisted rapid palatal expansion). Métodos: o dispositivo MARPE foi confeccionado a partir de um expansor Hyrax convencional apoiado em quatro mini-implantes. Foi adotado o protocolo de expansão lenta, com um período total de ativações de 40 dias e 3 meses de contenção. Uma mecânica de tração intrusiva apoiada em mini-implantes foi utilizada para a correção da relação de Classe II subdivisão direita, adequação do perímetro da arcada inferior e correção do desvio da linha média antes da inclusão dos incisivos centrais superiores. Resultados: os registros pós-tratamento demonstraram o aumento de 5,0 mm na distância intermolares, relação bilateral de Classe I de molares e caninos, resolução do apinhamento superior e inferior, linhas médias dentárias coincidentes e intercuspidação adequada. Conclusões: a técnica MARPE é uma abordagem de tratamento efetiva para a resolução da deficiência de perímetro das arcadas dentárias relacionada à discrepância maxilar transversa em pacientes adultos.