Finding UDT Dependencies http://msdn.microsoft.com/en-us/library/ms345103.aspx

find_udt_deps.sql

-- http://msdn.microsoft.com/en-us/library/ms345103.aspx

SELECT o.name AS major_name, o.type_desc AS major_type_desc
     , c.name AS minor_name, c.type_desc AS minor_type_desc
     , at.assembly_class
  FROM (
        SELECT object_id, name, user_type_id, 'SQL_COLUMN' AS type_desc
          FROM sys.columns
     UNION ALL
        SELECT object_id, name, user_type_id, 'SQL_PROCEDURE_PARAMETER'
          FROM sys.parameters
     ) AS c
  JOIN sys.objects AS o
    ON o.object_id = c.object_id
  JOIN sys.assembly_types AS at
    ON at.user_type_id = c.user_type_id;