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Long-term clinical and prosthetic outcomes of soft liner attachments for bar/implant overdentures were not sufficiently investigated. The aim of this trial was to evaluate clinical and prosthetic outcomes of resilient liner and clip attachments for bar/implant-retained mandibular overdenture after 7 years. Thirty edentulous male participants received two implants in the canine areas of the mandible. Three months later, implants were splinted with a resilient bar. Mandibular overdentures were connected to the bars with either clip ( CR group, n = 15) or resilient liner ( RR group, n = 15) attachments. Plaque index ( PI), gingival index ( GI), probing depth ( PD), vertical bone loss ( VBL), horizontal bone loss ( HBLO) and prosthetic complications ( PCs) were evaluated at denture delivery (T0), 6 (T6m), 12 (T1), 24 (T2), 36 (T3), 48 (T4), 60 (T5), 72 (T6) and 84 (T7) months after insertion. PI and GI increased significantly with time for CR and decreased significantly for RR ( P < 0·001). PD increased at T1 ( CR) and T6 m ( RR) and then decreased thereafter ( P < 0·05). VBL increased significantly with time in both groups ( P < 0·005). HBLO increased at T2 ( CR) and T1 ( RR) and then decreased thereafter. CR recorded significant higher PI, GI, PD, VBLO and HBLO compared to RR at all observation times ( P < 0·042). The survival rates were 96·6% and 100% for CR and RR after 7 years. The most common PCs for CR and RR were clip wears and separation of the resilient liner from the denture base, respectively. Within the limitations of this study, resilient liner attachments are recommended for bar/implant-retained mandibular overdentures than clip attachments in terms of peri-implant tissue health and prosthetic complications after 7 years. [ABSTRACT FROM AUTHOR]

This study aimed to evaluate peri-implant tissue health of immediate loaded two implants retaining a mandibular overdenture with either magnetic or locator attachment. Thirty two completely edentulous patients (20 males/12 females) were randomly assigned into two groups. Each patient received two implants in the canine area of the mandible using flapless surgical technique. Mandibular overdentures were immediately connected to the implants with either magnetic (group I, GI) or locator (group II, GII) attachments. Peri-implant tissue health was evaluated clinically in terms of plaque scores ( PI), bleeding scores ( BI), probing depth ( PD), implant stability ( ISQ) and interleukin-1- β ( IL-1b) concentrations in peri-implant sulcular fluid. PI, BI and PD were measured at mesial, distal, buccal and lingual surfaces of each implant. Radiographic evaluation was performed in terms of vertical ( VBL) and horizontal ( HBLO) alveolar bone loss. Evaluations were performed 2 weeks (T0), 6 months (T1) and 12 months (T2) after overdenture insertion. Plague scores, PD, IL-1b, VBL and HBLO increased significantly with time. ISQ decreased significantly with time. BI showed no significant differences between observation times. GI recorded significant higher PI, ISQ and IL-1b at T2 compared to GII. GII recorded significant higher VBL than GI at T2 only. For HBLO, no significant differences between groups were noted. VBL and HBLO showed a significant positive correlation with PD. Locator attachments for immediate loaded implants retaining mandibular overdentures are associated with decreased plaque accumulation, decreased implant stability, decreased interleukin-1 β concentration in peri-implant crevicular fluid and increased per-implant vertical bone loss compared to magnetic attachments after 1 year. [ABSTRACT FROM AUTHOR]

The aim of this 1-year study was to evaluate and compare crestal bone loss and clinical outcomes of immediate and delayed loaded implants supporting mandibular overdentures with Locator attachments. In a randomised controlled clinical trial, 36 completely edentulous patients (mean age 59·6 years) who desired to improve the stability of their mandibular dentures were randomly assigned into two groups. Each patient received two implants in the canine area of the mandible after a minimal flap reflection. Implants were loaded by mandibular overdentures either 3 months (delayed loading group, G1) or the same day (immediate loading group, G2) after implant placement. Locator attachments were used to retain all overdentures to the implants. Peri-implant vertical ( VBL) and horizontal ( HBLO) bone losses and clinical parameters [plaque scores ( PI), gingival scores ( GI), probing depths ( PD) and implant stability ( ISQ)] were assessed at time of overdenture insertion (T0), 6 months (T6) and 12 months (T12) after overdenture insertion. After 12 months of overdenture insertion, two implants (5·5%) failed in G2. Vertical bone loss was significantly higher in G2 compared with G1, while HBLO demonstrated insignificant differences between groups. All clinical parameters ( PI, GI, PD and ISQ) did not differ significantly between groups. Vertical bone loss was significantly correlated with PD and HBLO. Immediately loaded two implants supporting a Locator-retained mandibular overdenture are associated with more vertical bone resorption when compared to delayed loaded implants after 1 year. Clinical outcomes do not differ significantly between loading protocols. [ABSTRACT FROM AUTHOR]

This study aimed to compare the influence of resilient liner and clip attachments for bar-implant-retained mandibular overdentures on opposing maxillary ridge after 5 years of denture wearing. Thirty edentulous male patients (mean age 62·5 years) received two implants in the anterior mandible after being allocated into two equal groups using balanced randomisation. After 3 months, implants were connected with resilient bars. New maxillary complete dentures were then constructed, and mandibular overdentures were retained to the bars with either clips (group I, GI) or silicone resilient liners (group II, GII). The prosthetic and soft tissue complications of the maxillary dentures were recorded 6 months (T6 m), 1 year (T1), 3 years (T3) and 5 years (T5) after overdenture insertion. Traced rotational tomograms were used for measurements of maxillary alveolar bone loss. The proportional value between bone areas and areas of reference not subject to resorption was expressed as a ratio ( R). Change in R immediately before (T0) and after 5 years (T5) of overdenture insertion was calculated. Maxillary denture relining times and frequency of flabby anterior maxillary ridge occurred significantly more often in GI compared with GII. The change of R in anterior part of maxilla was significantly higher than change of R in posterior part in both groups. GI showed significant resorption of anterior residual ridge compared with GII. Relining times and frequencies of flabby ridge were significantly correlated with change in R. Within the limitations of this study, resilient liner attachments for bar-implant-retained mandibular overdentures are associated with decreased resorption and flabbiness of maxillary anterior residual ridge and fewer maxillary denture relining times when compared with clip attachments. [ABSTRACT FROM AUTHOR]

Summary This article aimed to examine the clinical and radiographic outcome of mini dental implants (MDIs) supporting a mandibular overdenture. Twenty-eight patients (16 men and 12 women) complaining from insufficient retention of their mandibular denture received a total of 112 MDIs (four per patient) in the interforaminal area of the mandible using the non-submerged flapless surgical approach. Implants were immediately loaded with mandibular overdentures after implant insertion. Each implant was evaluated at the time of initial prosthetic loading, 6, 12, 24 and 36 months thereafter. Clinical evaluation was performed using plaque index (PI), gingival index (GI), probing depth (PD) and periotest values (PTVs). Radiographic evaluation was performed in terms of vertical (VBLO) and horizontal (HBLO) alveolar bone loss. Cumulative success and survival rates were calculated using life table analysis. Plaque index, GI, PD, VBLO and HBLO increased significantly in the first year after overdenture insertion, and no significant difference between subsequent observations was noted. Periotest values demonstrated no significant difference between observation times. The cumulative survival and success rates of MDIs were 96·4% and 92·9%, respectively. Within the limitations of this study, clinical and radiographic peri-implant tissue responses of immediately loaded MDIs supporting a mandibular overdenture were favourable after 3 years. However, randomised, controlled clinical trials are needed to compare these responses to that of conventional-diameter implants. [ABSTRACT FROM AUTHOR]