Long-term Effectiveness of Maxillary and Mandibular Bonded Orthodontic Retainers.

Kocher, Katharina E; Gebistorf, Meret C; Pandis, Nikolaos; Fudalej, Piotr S.; Katsaros, Christos (2020). Long-term Effectiveness of Maxillary and Mandibular Bonded Orthodontic Retainers. Oral health & preventive dentistry, 18(3), pp. 633-641. Quintessenz Verlags-GmbH 10.3290/j.ohpd.a44939

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PURPOSE

This retrospective cohort study investigated the long-term effectiveness of one type of maxillary and 2 types of mandibular fixed lingual retainers.

MATERIALS AND METHODS

Eighty orthodontic patients in retention for 10-15 years were included. Irregularity index, intercanine width, overjet (OJ) and overbite (OB) were measured on plaster models at 3 occasions: (T1) pre-treatment, (T2) post-treatment and (T3) 10-15 years post-treatment. Analyses assessed the effect of the retainer type and time on mandibular irregularity, intercanine width and retainer failure.

RESULTS

In the mandible, the irregularity index increased (0.43 mm) between T2 and T3 for the 0.027" β-titanium (TMA) retainers bonded to canines only while it was stable (-0.02 mm) for the 0.016" x 0.022" braided stainless steel retainers (SS6) bonded to all six anterior teeth. The intercanine width was relatively stable in both groups during the entire observation period. In the maxilla, the irregularity index was stable between T2 and T3 (+0.07 mm). The intercanine width increased (+2.02 mm) during treatment T1-T2 and was stable (-0.02 mm) in the retention phase T2 to T3.

CONCLUSIONS

In the mandible, SS6 retainers were slightly more effective in maintaining alignment compared to the TMA retainers. In the maxilla, the SS4 retainers without canine extensions were effective in maintaining alignment. All retainers were effective in maintaining the intercanine width.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Orthodontics

UniBE Contributor:

Pandis, Nikolaos; Fudalej, Piotr and Katsaros, Christos

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1602-1622

Publisher:

Quintessenz Verlags-GmbH

Language:

English

Submitter:

Renate Imhof-Etter

Date Deposited:

18 Aug 2020 09:16

Last Modified:

18 Aug 2020 09:16

Publisher DOI:

10.3290/j.ohpd.a44939

PubMed ID:

32700517

Uncontrolled Keywords:

adverse effects effectiveness efficiency failures fixed retainers irregularity index long-term retention retention

BORIS DOI:

10.7892/boris.145943

URI:

https://boris.unibe.ch/id/eprint/145943

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