From the introduction, which sentence introduces who else has done this study?
A、Overall 10 publications with clinical trials could be identified. Their clinical outcome was compared with that laboratory bond strength studies
B、While from 1990 to 1999 in total only 5 articles on this topic could be identified in the PubMed database, it increased to 15 articles in the years 2000–2004 und to 96 articles from 2005 to 2009
C、On densely sintered zirconia clinically no durable bonding was achieved using silica-coating, silane application and using a MDP containing luting resin
D、However, despite the use of retentive preparation design a debonding rate of 13.3% occurred within the first 53 months 无解析