An appraisal of the literature on centric relation. Part III

Abstract

The literature directly and indirectly related to centric relation (CR) has been reviewed chronologically. More than 300 papers and quoted sections of books have been divided into three sections. The first two parts are related to CR. Studies in this group mainly compared, either the position of the mandibular condyle or the mandible itself in different CR recordings. Various tools were discussed for this purpose. The third part of the paper is about CR-centric occlusion (CO) discrepancy. CR still remains one of the controversial issues in prosthodontics and orthodontics. Debates such as mounting casts on the articulator by reproducible records for orthodontic treatment planning and end results, and whether or not orthodontic treatment based on CO causes TMJ dysfunction, remain unsolved. The references are listed at the end of Part III.

Reproducibility of Centric Relation Techniques by means of Condyle Position Analysis

“…This strong consistency might be the result of a better subject "deprogramming" procedure prior to the CR record registration. Numerous scientific publications (21,26,32,(33)(34)(35)(36) have pointed out that bimanual mandibular manipulation with anterior deprogrammer is one of the most reliable and reproducible methods of determining CR in dentistry. However, there are also scientific publications that oppose this finding, as the one conducted by Paixão et al (37).…”

Cone-beam tomography assessment of condylar position discrepancy between centric relation and maximal intercuspation

“…The limitations of these methods used to examine TMJ anatomy are subject to much controversy and debate in scientific circles, warranting further clarification. 1,2,4 The introduction of cone-beam computerized tomography, a reliable and affordable three-dimensional diagnostic tool, created the possibility of faithfully reproducing any anatomical condition of the craniofacial complex. 11 It is well known that spatial variations in the position of the condyle relative to the mandibular fossa in the RC and MI maxillomandibular positions are mostly very small -on the order of millimeters -and occur in approximately 90% of the entire population.…”

“…11 It is well known that spatial variations in the position of the condyle relative to the mandibular fossa in the RC and MI maxillomandibular positions are mostly very small -on the order of millimeters -and occur in approximately 90% of the entire population. 4,5 Even though we used one of the most advanced imaging methods available for application in Dentistry, the Ethics Committee of the Federal University of Uberlândia determined that our sample be reduced to 20 individuals because of the exposure of human subjects to X radiation.…”

“…Systematic literature reviews include authors in favor of an extensive use of CR in the planning of occlusal rehabilitation therapy and orthodontics, 1,3 alongside others who suggest an individual analysis of each clinical situation when determining which maxillomandibular relationship should be considered correct. 4,5 Despite the different opinions about how and when to use either of these two maxillomandibular positions, one point of relative acceptance among scientists is that most individuals in the population have discrepancies between CR and MI, 4 mainly symptomatic individuals and those with Class II and III malocclusions. [6][7][8][9][10][11] Among the methodological resources most widely used in studies comparing variations between maxillomandibular relations are articulator casts and conventional radiography.…”

Tam Protez Yapiminda Teori̇k Ve Prati̇k Eği̇ti̇mi̇n Sübjekti̇f Değerlendi̇ri̇lmesi̇

“…Tedavi, diĢsiz hastanın anamnezinin alın-ması 3,4 , klinik ve radyografik değerlendirme ile baĢlar 1,3 ve 1.ölçü, 2. ölçü alımı 1,3, [5][6][7][8][9] , okluzal mum duvarların hazırlanması 7,10 , dikey boyutun saptanması 1,3, [11][12][13] , sentrik iliĢki tespi 3,5,[12][13][14][15][16][17] , kayıtların artikülatö-re transferi 1,3,5,[18][19][20][21][22][23][24][25][26] , diĢ seçimi, diĢ dizimi ve diĢli provadan 1,3,27-30 sonra sıcak akril tepimi, tesviye ve cila iĢlemleri 1,3 , tam protezlerin elde edilmesi, protezlerin hastaya uygulanması ve uyumlandırılması ile tamamlanır.…”