Journal List > J Korean Acad Prosthodont > v.51(4) > 1034753

Jung, Paeng, Cho, and Lee: The study on success rate of single implant replacing the mandibular first and second molars

Abstract

Purpose

After the introduction of concept of osteointegration, dental implantology have been successful procedure in the dental field. Recently, it has shown successful results when used to restore single tooth missing. Considering the difference in bone quality of the mandible and maxilla, and the increased occlusal force in the posterior region, the success rates in each region may be different. In this study, success rates of single implants placed in the mandibular first and second molar areas were analyzed.

Materials and methods

The subjects were patients (284 patients, 308 implants) who had been operated with single implant installation from 2002 to 2009 in seven dental clinics in Daegu city. One hundred sixty eight implants were placed in the mandibular 1st molar and 140 implants were placed in the mandibular 2nd molar. They were analyzed according to implant site, age, sex, length and diameter.

Results

The survival rates of single implant of this study were 97.6% in the mandibular 1st molar and 92.9% in the mandibular 2nd molar. In the mandibular 1st molar, 4 implants were failed. In the mandibular, 2nd molar, 10 implants were failed.

Conclusion

The restoration of the mandibular 1st molar using single implant was found to be clinically acceptable treatment and showed higher survival rate than mandibular 2nd molar single implant. Single implant in mandibular 2nd molar needs careful consideration of poor bone quality, risk of overloading and anatomical structure of the mandible. (J Korean Acad Prosthodont 2013;51:252-60)

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Fig. 1.
Survival rate analysis.
jkap-51-252f1.tif
Table 1.
Distribution of implant according to age and sex
Age Mn. 1st molar Mn. 2nd molar Total
Male Female Male Female
10 - 19 2 3 - - 5
20 - 29 6 12 3 2 23
30 - 39 24 11 18 10 63
40 - 49 28 25 26 19 98
50 - 59 19 15 19 21 74
60 - 69 5 7 12 6 30
70 - 79 6 5 2 2 15
Total 90 78 80 60 308
Table 2.
Distribution of implant according to length and diameter
  Implant diameter Implant length (mm) Total
6 8 10 12
Mn. 1st molar Below 3.9 - 2 3 4 9
  4.0 - 4.9 1 20 98 35 154
  Over 5.0 - 2 2 1 5
Mn. 2nd molar Below 3.9 - - 2 2 4
  4.0 - 4.9 3 22 94 10 129
  Over 5.0 - 2 5 - 7
Total   4 48 204 52 308
Table 3.
Survival rate according to implant site and manufacturer
  1st molar 2nd molar
  No. of implants No. of failed implants Survival rate (%) No. of implants No. of failed implants Survival rate (%)
s-Clean® 111 4 96.4 81 8 90.1
Straumann® 57 0 100 59 2 96.6
Total 168 4 97.6 140 10 92.9
Table 4.
Survival rate of implant site according to sex
  Male Female
  No. of implants No. of failed implants Survival rate (%) No. of implants No. of failed implants Survival rate (%)
1st molar 90 2 97.8 78 2 97.4
2nd molar 80 6 92.5 60 4 93.3
Total 170 8 95.3 138 6 95.7
Table 5.
Survival rate of implant site according to age
Age 1st molar 2nd molar
No. of implants No. of failed implants Survival rate (%) No. of implants No. of failed implants Survival rate (%)
10 - 19 5 0 100 0 0 -
20 - 29 18 0 100 5 0 100
30 - 39 35 0 100 28 3 89.3
40 - 49 53 2 96.2 45 1 97.8
50 - 59 34 1 97.1 40 4 90.0
60 - 59 12 1 91.7 18 2 88.9
70 - 79 11 0 100 4 0 100
Total 168 4 97.6 140 10 92.9
Table 6.
Survival rate of implant site according to surgical method
  1 Stage 2 Stage
No. of implants No. of failed implants Survival rate (%) No. of implants No. of failed implants s Survival rate (%)
1st molar 165 4 97.6 3 0 100
2nd molar 134 7 94.8 6 3 50
Total 299 11 96.3 9 3 66.7
Table 7.
Survival rate of implant site according to diameter of implant
Diameter (mm) 1st molar 2nd molar
No. of implants No. of failed implants Survival rate (%) No. of implants No. of failed implants Survival rate (%)
Below 3.9 9 0 100 4 0 100
4.0 - 4.9 154 4 97.4 129 9 93.0
Over 5.0 5 0 100 7 1 85.7
Total 168 4 97.6 140 10 92.9
Table 8.
Survival rate of implant site according to length of implant
Length (mm) 1st molar 2nd molar
No. of implants No. of failed implants Survival rate (%) No. of implants No. of failed implants Survival rate (%)
6 1 0 100 3 1 66.7
8 24 1 95.8 24 3 87.5
10 103 2 98.1 101 5 95.0
12 40 1 97.5 12 1 92.7
Total 168 4 97.6 140 10 92.9
Table 9.
Failed implants analysis
No. Site Sex Age Implant Time of insertion Period (month) Method of Surgery Reason of failure
Manufacture Diameter/Length (mm)
1 #46 F 48 s-Clean® 4.3/10 2007.03 10 1-stage Mob
2 #36 M 55 s-Clean® 4.3/10 2007.11 3 1-stage Mob
3 #46 F 63 s-Clean® 4.3/8 2008.11 2 1-stage Mob
4 #46 M 42 s-Clean® 4.8/12 2008.12 8 1-stage Peri
5 #37 F 54 s-Clean® 4.8/10 2005.09 27 1-stage Mob
6 #37 M 69 s-Clean® 4.8/10 2005.10 10 1-stage Peri
7 #37 M 57 Strauman® 4.8/6 2006.02 5 2-stage Mob
8 #37 F 39 Strauman® 4.1/10 2006.06 11 2-stage Peri
9 #37 F 34 s-Clean® 4.8/12 2007.05 1 1-stage Peri
10 #37 M 52 s-Clean® 4.3/8 2007.09 3 1-stage Mob
11 #47 M 54 s-Clean® 5.5/10 2007.09 3 2-stage Num
12 #37 M 36 s-Clean® 4.8/8 2007.12 1 1-stage Mob
13 #37 F 63 s-Clean® 4.3/10 2008.05 4 1-stage Mob
14 #47 M 46 s-Clean® 4.8/8 2008.08 2 1-stage Num

∗ Mob: Implant mobility, Num: Numbness, Peri: Peri-implantitis, Period: Month of removal after implant insertion.

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