Why are Match rates so low in dentistry?

Most specialties in dentistry hover around a 50-60% match rate. However in Medicine most specialties have 90%+ match rates, and even the toughest specialties such as Derm/Ortho/Neurosurg all have match rates 75%+. Med students make it seem as if specializing in Derm is almost impossible, you need a crazy high class rank and crazy high board scores, yet their match rate is so high. In comparison all dental specialties seem tougher. Am I interpreting these statistics incorrectly? Is there... Why are Match rates so low in dentistry?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Dental Source Type: forums