The effect of maximum bite force on marginal bone loss of mini-implants supporting a mandibular overdenture: A randomized controlled trial

J. Jofré, T. Hamada, M. Nishimura, C. Klattenhoff

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

Objectives: To evaluate the effect of maximum bite force (mBF) on marginal bone loss (MBL) around mini-implants in edentulous patients wearing mandibular overdentures with two retention systems: ball and bar. Material and methods: Forty-five totally edentulous patients were selected from a public health center. All of them received two mini-implants (1.8 × 15 mm; Sendax ®) in the anterior mandible using a minimally invasive technique. A single randomization was performed to allocate the patients in two groups. Group I (n=22) received two single ball-type mini-implants and Group II (n=23) received two mini-implants splinted with a prefabricated bar. The mBF was recorded using a press-sensitive sheet Dental Prescale® (Fuji) and MBL using standardized radiographs of each mini-implant at the baseline and 5, 7, 10, and 15 months after surgery; the values were compared between groups. Results: Two members of Group I failed to complete the study, decreasing the number of participants to 20. There was no relationship between the mBF and the MBL of the mini-implants (Spearman's ρ rs=0.147; P=0.378). At the 15-month follow-up, the average mBF for Group I (ball) was 247.53 ± 132.91 N and that of Group II (bar) only 203.23 ± 76.85 N (Mann-Whitney test; P=0.586). The MBL values were also higher for Group I (1.40 ± 1.02 mm) than Group II (0.84 ± 0.66 mm) during the entire 15-month follow-up period (Mann-Whitney test; P=0.077). Conclusions: No relationship was found between mBF and MBL for patients wearing overdentures retained on mini-implants using bar or ball attachment systems.

Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalClinical Oral Implants Research
Volume21
Issue number2
DOIs
Publication statusPublished - 2010 Feb 1

Keywords

  • Marginal bone loss
  • Maximum bite force
  • Mini-implants
  • Overdentures

ASJC Scopus subject areas

  • Oral Surgery

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