Mandibular overdentures retained by conventional or mini implants: a randomized clinical trial (parte I)

Author(s)

Adriana Barbosa Ribeiro

• Document type: Doctoral Thesis
• Press: Ribeirão Preto.
• Institution: Universidade de São Paulo (USP). Faculdade de Odontologia de Ribeirão Preto (PCARP/BC)
• Defense date: 2015-01-13

Examining board members

Raphael Freitas de Souza; André Ulisses Dantas Batista; Marco Antonio Compagnoni; Fernanda de Carvalho Panzeri Pires de Souza

• Advisor: Raphael Freitas de Souza

Abstract

The retention of removable dentures by mini-implants is a relatively recent treatment modality, and may lead to minimal postoperative trauma and reduced costs. This study aimed to compare oral health-related quality of life and patient satisfaction, as well as postoperative pain and discomfort, following the insertion of mini-implants (two or four) or two standard-size implants for the retention of mandibular overdentures. One hundred and twenty edentulous participants (mean age 59.5±8.5 years) were randomly allocated into three groups according to received treatment: (GI) four mini-implants, (GII) two mini-implants, or (GIII) two standard implants. Seven days after implant insertion, patients answered questions (100-mm VAS Visual Analog Scale) relating to pain, swelling, and discomfort with chewing, speech and hygiene, considering their experiences during the 1st and 6th day. Before the interventions and after 3 and 6 months following insertion, OHRQoL was evaluated by means of the OHIP-EDENT questionnaire and patient satisfaction was analyzed by a specific questionnaire answered on a 100-mm VAS. Groups were compared by two-way ANOVA or Generalized Estimating Equations (GEE) (α=0.05). All participants (GI: 38; GII: 42; GIII: 40) were analyzed after seven days of postoperative pain and discomfort, and 112 answered questions regarding oral health-related quality of life and patient satisfaction. At the 6th day, GI felt significantly higher pain than GII and GIII. GI also reported more difficulty in performing oral hygiene practices than GIII during the 1st day. There was no significant difference between groups for the other questions and periods. The findings from OHIP-EDENT indicate that both two and four mini-implants led to better OHRQoL, compared to two conventional implants. At three and six months, we found that the group treated with four mini-implants was more satisfied than the two conventional implants and two mini-implants was presented intermediate values. It can be concluded that the use of four mini-implants induces more intense postoperative pain at the 6th day than the insertion of two mini- or conventional fixtures, as well as more difficult oral hygiene on the 1st day. Furthermore, the treatment by mini-implant overdentures is comparable to the standard of care for edentulism, according to the patient perspective. Treatment by either two or four mini-implants achieve similar or even slightly better OHQoL and satisfaction compared to two conventional implants (AU)

• FAPESP's process: 11/23347-0 - MANDIBULAR OVERDENTURES RETAINED BY CONVENTIONAL OR MINI IMPLANTS: A RANDOMIZED CLINICAL TRIAL (PART I)
• Grantee: Adriana Barbosa Ribeiro
• Support Opportunities: Scholarships in Brazil - Doctorate