Sabri Roy, Aboujaoude Nadim
BP 16-6006, Beyrouth, Liban.
Orthod Fr. 2008 Dec;79(4):283-93. doi: 10.1051/orthodfr:2008020. Epub 2008 Dec 9.
Missing maxillary lateral incisors create a major esthetic problem due to their strategic position in the smile. The two treatment approaches commonly taken are creating adequate space to prosthetically replace the missing lateral incisors or closing the spaces and replacing the missing lateral incisors by the canines. This article will discuss indications, advantages, disadvantages and problems encountered in cases of space opening and space closure for missing laterals. The amount of space to be created, the preparation and the timing for implant placement, the bone volume, the implant size and prosthetic considerations will also be discussed. The methods for reshaping canines and building them up to simulate lateral incisors in orthodontic space closure, and positioning the canines and first premolars - so that they resemble to the teeth they are replacing - will be described.
上颌侧切牙缺失会造成严重的美观问题，因为它们在微笑时处于关键位置。通常采用的两种治疗方法是创造足够的空间以修复缺失的侧切牙，或者关闭间隙并用尖牙替代缺失的侧切牙。本文将讨论侧切牙缺失时开辟间隙和关闭间隙的适应证、优点、缺点及遇到的问题。还将讨论开辟间隙的量、种植体植入的准备工作和时机、骨量、种植体尺寸以及修复方面的考虑因素。将描述在正畸关闭间隙过程中重塑尖牙并使其形态类似侧切牙的方法，以及尖牙和第一前磨牙的定位方法，以使它们与所替代的牙齿相似。
