Garcia Lily T, Bohnenkamp David M
Department of Prosthodontics, University of Texas Health Science Center, San Antonio Dental School, San Antonio, Texas, USA.
Compend Contin Educ Dent. 2004 Jan;25(1):26, 28, 30-1.
The philosophy of positioning the margins of crowns supragingivally may not be applicable with the presence of caries, erosion, abfraction (noncarious cervical lesion), short clinical crown length, or esthetic concerns. In such situations, it is essential not only to record precise subgingival details of all of the prepared teeth but also to accurately transfer them to a working master cast. If a patient presents with oral and/or gingival conditions that compromise the clinician's ability to obtain a single full-arch impression for extensive fixed restorations, a technique using sectional impressions, an intraoral transfer index, and a transfer impression for transfer dies will play a vital role in the patient's treatment.
将牙冠边缘置于龈上的理念，在存在龋齿、牙侵蚀、牙体楔状缺损（非龋性颈部病变）、临床冠短或美观问题时可能并不适用。在这种情况下，不仅要精确记录所有预备牙的龈下细节，还需准确地将这些细节转移到工作模型上。如果患者存在口腔和/或牙龈状况，影响临床医生为广泛的固定修复获取单全牙弓印模的能力，那么使用分段印模、口内转移指数以及用于转移代型的转移印模的技术，将在患者的治疗中发挥至关重要的作用。
