Effect of Distal Implant Inclination on Dislodging Forces of Different Locator Attachments Used for Mandibular Overdentures: An In Vitro Study

ELsyad, Moustafa Abdou; Emera, Radwa Mohsen Kamal; Ashmawy, Tarek Mohy

doi:10.1111/jopr.12710

Cited by 22 publications

(43 citation statements)

References 36 publications

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“…Sample size calculation was based on the results of Stephens et al, Mínguez-Tomás et al, and Elsyad et al [17,27,28], with a power of 0.8 and a level of significance of 0.05. In total, 96 individual attachment combinations were produced for this study.…”

Section: Methodsmentioning

confidence: 99%

Retentive Characteristics of a New Attachment System for Hybrid Dentures

et al. 2020

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Removable implant-anchored dentures have become an established treatment concept especially for older, multimorbid patients. This study investigates the retention force (RF) of two different attachment systems. A total of 96 specimens (n = 8 for each condition) were fabricated and RF was measured under different conditions: fatigue (10,000 cycles dislodging), thermal undulation (5/55 °C, 5000 cycles) and implant-angulation (0°, 5°, 10°, 15°, 20°). The Novaloc system ((N), 0° and 15° abutments, yellow matrix (Y)) was compared to the Locator system ((L), pink (P) and orange (O)). Initial RFs (8.57 ± 0.99 N (NY), 19.39 ± 8.10 N (LP), 8.8 ± 5.28 N (LO)) were reduced by ageing simulation (26% (NY), 66% (LP), 89% (LO); p < 0.001). After thermocycling, Novaloc’s RFs decreased by 33% (p < 0.001) while the Locators’ RFs increased by 34% (LP: p = 0.002, LO: p = 0.148). In contrast to LP, the RFs of Novaloc abutments and LOs predominantly showed no clinically relevant dependence on implant angulation. Ageing processes tended to result in lower RFs at higher implant angulation. Thus, the Novaloc attachment system offers an alternative to Locator attachments. It is characterized by a comparatively continuous RF-curve over the entire wearing period. Future clinical studies have to be conducted to verify the in vitro demonstrated advantages of the Novaloc system.

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Section: Methodsmentioning

confidence: 99%

Retentive Characteristics of a New Attachment System for Hybrid Dentures

et al. 2020

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“…When an implant is placed, especially in the anterior mandible, the implant tends to be buccally or lingually inclined because of the anatomy of the ridge in this area. However, use of an appropriate insert prevented the decrease in retention in patients with angulated implants [9,10]. Locator attachments are now frequently used with 1-IODs [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preliminary study of clinical outcomes for single implant-retained mandibular overdentures

et al. 2020

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This study evaluated marginal bone loss and prosthetic complications associated with single implant-retained mandibular overdentures (1-IODs) with locator attachments. The 1-IOD was placed in the mandibular midline by using a conventional loading protocol in 22 patients with an edentulous mandible. Marginal bone loss at the start of loading and 12 months postoperatively was assessed by radiographic and crestal bone evaluation. The crestal bone was defined as the distance between the customized abutment shoulder and the top of the bone, as indicated by probing. In addition, implant stability quotient and prosthetic complications were recorded. The cumulative implant survival rate was 95.5%. Median implant stability quotient remained greater than 80, and median radiographic bone loss was 0.56 mm. Crestal measurement showed a median crestal bone loss of 0.16, 0.43, 0.39, and 0.52 mm on the buccal, right, lingual, and left sides, respectively. Both radiographic and crestal bone loss values significantly differed between the start of implant loading and 12 months postoperatively (except on the buccal and lingual sides; P < 0.05). The need to replace the nylon insert was the most common complication. Conventional loading of a 1-IOD with a locator attachment resulted in a high survival rate, good implant stability, and acceptable marginal bone loss. Materials and Methods Study designTwenty-two patients (10 men, 12 women; age range 61-91 years) with an edentulous mandible were recruited at the Dental Hospital of Tokyo Medical and Dental University from October 2015 through March 2016. The study inclusion criteria were presence of an edentulous mandible for at least 6 months; sufficient bone height (≥13 mm) and width (≥6.1 mm) at the mandible midline; written and spoken Japanese skills adequate to respond to questionnaires; and age older than 50 years. Patients were excluded if they had a medical contraindication to implant surgery, were receiving bisphosphonate therapy at the time of the study, had a history of chemotherapy or radiation therapy to the head or neck, smoked >20 cigarettes a day, or had an infection, a psychiatric disorder, a temporomandibular disorder, dry mouth, or oral dyskinesia.The sample size required for this study was estimated by using 100-mm Visual Analog Scale (VAS) scores for patient satisfaction, as described in the trial protocol of Kanazawa et al. [23]. Twenty participants were required for 80% power with a 2-sided alpha level of 0.05, when VAS scores were assumed to be normally distributed. Twenty-two participants were recruited, to allow for dropouts. The study protocol was approved by the

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“…Rutkunas et al concluded that only minimal changes in the inner diameter of the metal housing of the plastic inserts are induced by simulated wear . Observational data based on analysis, stereomicroscopic photographs, and digital micrometric measurements confirmed the presence of dimensional changes, deformation, and surface alterations of the interchangeable plastic inserts following cyclic seating‐unseating . Surface wear tends to be more expressed on the central stud than on the outer ring of the plastic insert in contact with the metal undercuts of the Locator abutment …”

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confidence: 99%

“…3 The most common prosthetic complication associated with the use of the Locator system is loosening of the retentive mechanism. 4,5 Chemical and thermal factors such as exposure to lubricants and biologic fluid environments, 6 denture cleansers, [7][8][9] or high temperatures, 10 as well as mechanical factors such as repeated insertion-removal cycles of the prosthesis, [11][12][13][14][15] implant angulation and interimplant divergence, [16][17][18][19][20][21][22][23][24][25] abutment height, 26 mastication, 27,28 and type of dislodging forces 29 have been demonstrated to negatively affect the retention of Locator attachments. 25,26 The exact mechanisms by which mechanical factors result in retention loss of the Locator system are poorly documented.…”

mentioning

confidence: 99%

“…13 Observational data based on analysis, stereomicroscopic photographs, and digital micrometric measurements confirmed the presence of dimensional changes, deformation, and surface alterations of the interchangeable plastic inserts following cyclic seatingunseating. 3,13,[15][16][17][18][19]30 Surface wear tends to be more expressed on the central stud than on the outer ring of the plastic insert in contact with the metal undercuts of the Locator abutment. 13,30 Chewing may induce different patterns of structural changes and retention loss when compared to cyclic insertion-removal.…”

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confidence: 99%

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