This is one of the most used instruments to measure oral health related quality of life but it has been used in many different ways. Some researchers used only the frequency score, others multiply the frequency by the severity score. There are versions with 11, 9, and 8 items. How to deal with so many different versions? Which is the best validated?
I would suggest using the Oral Health Impact Profile (OHIP). It is more popular and better investigated. Furthermore, the factor structure has been recently analyzed in a large international study, with a dominant general factor and a four-factor structure of Psychosocial Impact, Orofacial Pain, Oral Function, and Orofacial Appearance as dimensions of oral health-related quality of life (see John MT, Reissmann DR, Rener-Sitar K, Celebic A, Baba K, Larsson P, Szabo G, Rush WA, Rindal DB, Feuerstahler L, Waller N. The factor structure of the oral health impact profile [abstract]. J Dent Res. 2013;92A:2583.).
We have also published CFA of OHIP, we are analysing OIDP now. We know that both are the two most popular. However, OIDP has also been used in so many different ways that it seems out of control. Some people are using only the frequency questions, so to make it simpler.
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