Naslov
Class II division I malocclusion: comparison of two treatment approaches with untreated subjects

Autori
Špalj, Stjepan ; Mroz Zurawska, Katarzyna ; Birkeland, Kari ; Vandevska-Radunovic, Vaska

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
3rd congress of the Macedonian Orthodontic Society with international participation

Mjesto i datum
Ohrid, Sjeverna Makedonija, 12.05.2016. - 15.05.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
functional appliances; dentofacial orthopedics; mandibular growth

Sažetak
Aims: To compare the treatment effect of functional appliances Twin Block (TB) and activator-headgear (AH) on skeletal, dental and soft tissue structures in Class II division 1 malocclusion with normal growth changes of untreated subjects. Subjects and methods: The sample included 50 subjects (28 females) in pre-pubertal stages or peak growth velocity aged 8-13 years (median 11) with Class II division 1 malocclusion treated with either AH (N=25) or TB appliances at the University Dental Schools in Oslo, Norway and Rijeka, Croatia. Pre- and post-treatment lateral cephalograms were evaluated and compared to 50 untreated Class II division I cases matched by age, gender, ANB angle and skeletal maturity. Discriminant analysis was performed. Results: Treated subjects in comparison to untreated controls exhibited higher increase in SNB angle, protrusion of mandibular incisors, decrease of ANB, decrease in increment of SNA, retroclination and retrusion of maxillary incisors, and decrease of facial convexity and upper facial height. Changes in those features accounted for high variability of distinction between treated and untreated subjects accounted for (90.9% ; p<0.001). TB treatment in comparison to AH produced more proclination of mandibular incisors, lower lip protrusion, more enhanced effective growth of maxilla and mandible, while AH produced anterior rotation of mandible. Discrimination between the two treatment groups was low (9.1% ; p=0.041). Conclusions: Both appliances contributed successfully to the correction of Class II division 1 malocclusion due to improved skeletal, dentoalveolar and soft tissue characteristics. However, treatment with TB results in more enhanced mandibular growth but also more mandibular incisor proclination.

Izvorni jezik
Engleski

Znanstvena područja
Dentalna medicina

Napomena
Potpora istraživanju PREDIKTIVNI ČIMBENICI USPJEHA ORTODONTSKE TERAPIJE U DJECE I ADOLESCENATA (13.06.2.1.53) financirano sredstvima Sveučilišta u Rijeci

POVEZANOST RADA