Centric relation definition: a historical and contemporary prosthodontic perspective

Area of Science:

• Dentistry
• Prosthodontics
• Dental Anatomy

Background:

• Centric relation (CR) is a fundamental concept in dentistry, particularly prosthodontics.
• Numerous definitions of CR have evolved over the past century, leading to significant confusion.
• Existing definitions lack clinical applicability and consensus among dental professionals.

Purpose of the Study:

• To critically analyze all historical definitions of centric relation from 1929 to 2010.
• To identify the shortcomings and inconsistencies in current definitions of CR.
• To propose a new, self-explanatory definition of CR to enhance understanding and clinical application.

Main Methods:

• Comprehensive literature review of definitions of centric relation (CR).
• Searches conducted using PubMed (keywords: centric relation/centric jaw relation) and hand searches.
• Analysis of definitions from 1929 to 2010, categorized into specific time periods.

Main Results:

• A lack of consensus persists regarding the definition of CR despite numerous attempts.
• Current definitions, including those in prosthodontic glossaries, are often confusing and clinically impractical.
• Historical definitions have undergone repeated changes without achieving universal clarity.

Conclusions:

• A clear, clinically relevant definition of centric relation is crucial for dental education and practice.
• The proposed definition aims to minimize confusion and improve the understanding of CR.
• Centric relation remains a clinically significant and repeatable jaw relation essential for prosthesis fabrication.