Comparison of vacuum-formed and Hawley retainers: A systematic review

Mai, Wenjia; He, Jin’an; Meng, H.P.; Jiang, Yanping; Huang, Chaoxiao; Li, Min; Yuan, Kangze; Kang, Ning

doi:10.1016/j.ajodo.2014.01.019

Cited by 80 publications

(66 citation statements)

References 25 publications

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“…If vertical settling is not complete during orthodontic treatment, it needs to occur during the retention period and the retention appliances should enable vertical settling. However, several studies have concluded that CORs will prevent vertical settling during post-orthodontic occlusion 5679. To increase vertical settling after orthodontic treatment, Aslan et al7 developed the partial-coverage retainer by opening the posterior occlusal surfaces and reported increased occlusal contacts.…”

Section: Discussionmentioning

confidence: 99%

Effects of a new type of clear overlay retainer on occlusal contacts

et al. 2017

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The popularity of clear overlay retainers (CORs) has increased recently because of their advantages such as better esthetics, cost effectiveness, easy fabrication, and good compliance. However, a deficiency in posterior occlusal settling is a reported limitation of CORs. The aim of this study was to evaluate the posterior occlusal contact changes in a new type of clear orthodontic retainer called Oral-treaper (OTP), which consists of three layers and has stronger mechanical characteristics than do conventional retainers. Three patients who completed fixed orthodontic treatment received OTP as a removable retainer. Cast models were fabricated after the removal of fixed appliances (T1) and after 4 to 11 months of using the retainers (T2). We evaluated all the cast models to compare the post-orthodontic settling pattern during the use of the OTPs. The depth of occlusal contacts was evaluated using color maps. The OTP did not prevent vertical settling in all patients but resulted in an improvement in posterior occlusal contact points.

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Section: Discussionmentioning

confidence: 99%

Effects of a new type of clear overlay retainer on occlusal contacts

et al. 2017

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“…Thermoplastic clear retainers have increased in popularity as a result of their esthetic and translucent properties. [2][3][4] Though preferred because of their translucent nature, it has been reported 5 that the physical properties of thermoplastic retainers can be changed as a result of intraoral temperature fluctuations, as well as the retainers being subjected to cyclic deflections. Previous studies have reported poor wear resistance and durability of orthodontic appliances after ''short service periods''; furthermore, similar studies on mouth guards, made from comparable thermoplastic orthodontic materials, have demonstrat-ed various dimensional changes induced by aging, again depending on the particular material and processing techniques.…”

Section: Introductionmentioning

confidence: 99%

Long-term effects of seven cleaning methods on light transmittance, surface roughness, and flexural modulus of polyurethane retainer material

Agarwal

Wible

Ramir

et al. 2018

The Angle Orthodontist

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Objectives: To evaluate the long-term effects of seven different cleaning methods on light transmittance, surface roughness, and flexural modulus of a polyurethane retainer material. Materials and Methods: Polyurethane retainer specimens (Viverat, Align Technology Inc) (70 specimens, n ¼ 10 per method, 50.8 mm 3 12.7 mm 3 1.0 mm) were exposed to seven cleaning methods twice a week for 6 months. Before treatment and after 6 months, light transmittance, surface roughness, and flexural modulus of the specimens were quantified. Qualitative assessment of randomly selected specimens from each solution was performed at baseline and after 6 months using a scanning electron microscope. Statistical analyses were performed at the .05 significance level. Results: Of the three test variables, light transmittance through the specimens was the only one that changed significantly from baseline to 6 months for all cleaning solutions, with all of them causing a decrease. However, except for 0.6% sodium hypochlorite showing a change in surface roughness values and 2.5% vinegar and toothbrushing showing an increase in flexural modulus, none of the other four cleaning methods resulted in significant changes in surface roughness or flexural modulus values for the polyurethane specimens between baseline and after 6 months. Conclusions: Of the seven cleaning methods, Invisalignt cleaning crystals, Polidentt, and Listerinet showed the least amount of change in light transmittance values for the polyurethane specimens over 6 months, and they had no effect on surface roughness and flexural modulus values. (Angle Orthod. 2018;88:355-362.)

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“…1 Although various types of retainers are available for orthodontic retention, including Hawley retainer (HR), vacuum-formed retainer (VFR), and lingual fixed retainer, HR and VFR are the two most commonly used types. 2,3 The HR, designed by Charles Hawley in 1919, has been found effective after almost a century of clinical application. In 1971, an invisible retainer was designed as a more esthetic alternative removable type, known as a vacuum-formed retainer.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 There is insufficient evidence in terms of clinical effectiveness favoring either HR and VFR over the other. 2,5,6 Therefore, considerations more than clinical effectiveness may be taken in regard to the choice of retainer types. For instance, speech distortion may be affected by any device that impairs the movement or appearance of soft and hard oral tissues.…”

Section: Introductionmentioning

confidence: 99%

Speech effects of Hawley and vacuum-formed retainers by acoustic analysis: A single-center randomized controlled trial

Jia

Wang

Pei

et al. 2016

The Angle Orthodontist

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Objective: To investigate the effects of alteration on speech articulation of adult patients between Hawley retainers and vacuum-formed retainers by an objective acoustic analysis of vowels and voiceless fricatives. Materials and Methods: Twenty adults, aged 19.0-29.0 years, who had just finished active orthodontic treatment were included in this study. They were divided into a Hawley retainer group and a vacuum-formed retainer group by sortation randomization method.

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Comparison of vacuum-formed and Hawley retainers: A systematic review

Cited by 80 publications

References 25 publications

Effects of a new type of clear overlay retainer on occlusal contacts

Effects of a new type of clear overlay retainer on occlusal contacts

Long-term effects of seven cleaning methods on light transmittance, surface roughness, and flexural modulus of polyurethane retainer material

Speech effects of Hawley and vacuum-formed retainers by acoustic analysis: A single-center randomized controlled trial

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