Tooth Contact Patterns at the Mandibular Retruded Contact Position

Yamashita, Shuichiro; Kirihara, Takanao; Igarashi, Yoshimasa; Ai, Minoru

doi:10.2186/jjps.47.335

Cited by 1 publication

(3 citation statements)

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“…This conclusion is in agreement with findings in the present study. However, the frequency of unilateral RCP contact (3%) in this investigation was lower than in previous studies that reported frequencies ranging between 39% and 60% in asymptomatic subjects (10, 14, 33). The low frequency in the present study may be related to the exclusion criteria for subject selection.…”

Section: Discussioncontrasting

confidence: 90%

“…In our previous study investigating the locations of RCP contacts in 283 healthy subjects (33), tooth contacts at the first premolar and the second molar predominated, and it was concluded that these two teeth were key determinants of retrusive mandibular movement. This conclusion is in agreement with findings in the present study.…”

Section: Discussionmentioning

confidence: 97%

“…The three dental reference points moved in an inferior‐posterior direction during retrusion, whereas both condylar reference points moved superior‐posteriorly on average but with a wide variation ranging from superior‐posterior to inferior‐posterior directions. Based on our previous study (33), thirty subjects in the current study were divided into groups PM and M for further analysis. Group M consisted of only nine subjects in spite of the fact that contact was most frequent at the second molar.…”

Section: Discussionmentioning

confidence: 99%

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Relationship between tooth contacts in the retruded contact position and mandibular positioning during retrusion

Yamashita¹,

Hashii³

et al. 2006

J of Oral Rehabilitation

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We conducted a series of studies with the purpose to investigate the locations of tooth contacts in the retruded contact position (RCP) and to discuss their significance in the stomatognathic system. In the present study, the relationship between the locations of RCP contacts and mandibular positioning during retrusion was examined. Thirty dentists and clinical residents were selected as subjects. One specialist in prosthetic dentistry examined each subject for the location of the RCP contacts. The mandibular positioning during retrusion was measured using a mandibular movement analysis system with six degrees of freedom. Originally programmed software was developed. Five reference points were selected: the central lower incisor (point I), the first molars on both sides (points RM and LM) and the condyles on both sides (points RC and LC). Tooth contact was observed most frequently at the second molar, followed by the first premolar. Points I, RM and LM all moved in an inferior-posterior direction, whereas points RC and LC moved in various directions ranging from superior-posterior to inferior-posterior. When the subjects were divided into two groups according to the most anterior tooth of occlusion in the RCP, the condylar positioning tended to be more superior in the group with molar contact than that with premolar contact. These results suggest that the locations of RCP contacts could be an important factor in jaw guidance during retrusion.

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Section: Discussioncontrasting

confidence: 90%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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