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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (6): 1119-1123. doi: 10.19723/j.issn.1671-167X.2019.06.025

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Quantitative analysis of occlusal changes in posterior partial fixed implant supported prostheses

Qiang LUO1,Qian DING2,Lei ZHANG2,△(),Qiu-fei XIE2   

  1. 1. Institute of Stomatology, General Hospital of Chinese PLA, Beijing 100853, China
    2. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2017-10-23 Online:2019-12-18 Published:2019-12-19
  • Contact: Lei ZHANG E-mail:drzhanglei@yeah.net
  • Supported by:
    Supported by the National Natural Science Foundation of China(81671026);the Capital Health Development Research Special(2014-4-4105)

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Abstract:

Objective: To analyze changes in occlusal force distribution and occlusal contact in poste-rior partial fixed implant-supported prostheses over time, and to provide reference for the precise occlusion design, adjustment and maintenance of implant prostheses.Methods: According to certain inclusion and exclusion criteria, patients were recruited from partially edentulous patients who had received implant-supported single crown or fixed bridge in the posterior region. The patients were collected since the implant prostheses settling and scheduled for the routine examination of implant prostheses and the occlusal examinations of complete dentition after 2 weeks, 3, 6, and 12 months. Occlusal examinations were taken with the articulating papers and T-Scan Ⅲ ? (Tekscan, South Boston, USA), which could check and measure the occlusal contact condition of complete dentition. The occlusion time and relative occlusal forces of implant prostheses, mesial adjacent teeth and control teeth were recorded at the same time.Results: Thirty-seven posterior partial fixed implant prostheses in 33 patients (17 women and 16 men, aged 24-70 years) were followed up for 3-12 months (average 8.3 months). At baseline, the relative occlusal forces of implant prostheses were significantly lower than those of the corresponding control teeth (P<0.001). However, after 3 months, the relative occlusal forces of implant prostheses had significantly increased (P<0.05), while control teeth decreased significantly (P<0.05), resulting in no statistical significance between them. The implant prostheses occlusion time ratio also increased significantly from 2 weeks to 3 months (P<0.05). There was no significant difference from the third month to the sixth month, or from the sixth month to the twelfth month (P>0.05).Conclusion: Light contact and time-delayed occlusion of posterior implant prostheses changes significantly in the first three months after settling implant prostheses. These changes mainly include the advance of the time point of the implant prosthesis to start the occlusion contact, and the increase of the occlusal force of the implant prosthesis. The occlusion of posterior implant prostheses should be carefully monitored at end of the third month follow-up clinically.

Key words: Dental prosthesis, Dental occlusion, Dental implantation, Occlusal adjustment

CLC Number: 

  • R783.3

Figure 1

T-scan occlusal examination (A), digital images illustrating maximum intercuspation with corresponding articulating paper mark (B)"

Figure 2

The record of occlusion time from the beginning of bite to the balanced and stable occlusion position of dentition A point, the first occlusal contact of natural teeth; B point, the time of the balanced and stable occlusion position; A’ point, the first occlusal contact of implant prostheses. Implant occlusion time means the time from A’ point to B point."

Table 1

The comparisons of relative occlusal force between implant prostheses and control natural teeth over time"

Time points Implant
prostheses/%,
median (min, max)		 Control
natural teeth/%,
median (min, max)		 P
2 weeks (n=37) 7 (1, 18) 14 (3, 28) <0.001
3 months (n=27) 9 (1, 25) 11 (5, 24) 0.247
6 months (n=25) 9 (2, 25) 13 (3, 23) 0.156
12 months (n=14) 10 (3, 20) 14 (5, 28) 0.140

Figure 3

Relative occlusal force changes of mesial teeth, implant prostheses and control teeth over time A, from 2 weeks to 3 months; B, from 3 months to 6 months; C, from 6 months to 12 months."

Table 2

The statistical correlation between implant prostheses relative occlusal force and implant occlusion time ratio"

Time points Implant prostheses relative occlusal force/%,
median (min, max)		 Implant occlusion time ratio,
median (min, max)		 R P
2 weeks (n=37) 7 (1, 18) 0.44 (0.08, 1.00) 0.447 0.006
3 months (n=27) 9 (1, 25) 0.64 (0.11, 1.00) 0.714 <0.001
6 months (n=25) 9 (2, 25) 0.70 (0.19, 0.96) 0.497 0.011
12 months (n=14) 10 (3, 20) 0.83 (0.22, 0.93) 0.113 0.700

Figure 4

Longtitudinal changes of implant prostheses occlusion time ratio"

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