Occlus-o-Guide®versus Andresen activator appliance: neuromuscular evaluation

Abstract

BackgroundThe aim of the present study was to assess the muscular variations at the electromyography (EMG) level for the anterior temporalis muscles and masseter muscles during treatment with Occlus-o-Guide® and Andresen activator appliances.MethodsEighty-two patients (35 males and 47 females) aged between 8 and 12 years (mean age, 10.5 ± 0.8 years) participated in the study. Fifty patients underwent treatment with an Occlus-o-Guide® and 32 patients with an Andresen activator. All patients underwent EMG examination using a Freely EMG (De Gotzen, Legnano, Italy) and surface bipolar electrodes when the appliances were worn for the first time (T0), and after 6 months (T1) and after 12 months (T2) of appliance use.ResultsStatistical analysis showed that both at T0 and T2, the percent overlapping coefficient (POC) of the anterior temporalis muscles was not statistically different between the appliance groups. At T0, the POC of the masseter muscles was significantly lower for the Andresen appliance as compared to the Occlus-o-Guide® (p = 0.02), while at T2 this significance was lost.ConclusionsAt insertion of an appliance, all patients show neuromuscular balance that does not correspond to orthognathic occlusion. Both appliances work by creating muscular imbalance. With the appliances in situ, EMG responses were generally analogous for the Occlus-o-Guide® and the Andresen activator; however, the imbalance was greater and the recovery of the orthological muscular balance was slower in patients under treatment with the Andresen activator as compared to those with the Occlus-o-Guide®.

Verification of the Reliability of the Three-dimensional Virtual Presurgical Orthodontic Diagnostic Protocol

“…[17][18][19][20][21] The analysis of results, independently from the considered arch, shows that the discrepancies reported for the virtual diagnostic protocol are, on average, lower than those obtained in the group receiving the nonvirtual diagnostic protocol. Presurgical templates allow the orthodontist to more easily achieve the objectives set in the diagnostic phase.…”

Orthodontic-surgical treatment: neuromuscular evaluation in open and deep skeletal bite patients

“…These results have been obtained with both electromyographic systems. The following authors also proved that high-angle cases were associated with weaker musculature than low-angle patients: Moller [ 25 ], Sassouni [ 47 ], Ingervall and Thilander [ 26 ], Bakke and Michler [ 27 ], Kayukawa [ 28 ], Farronato et al [ 29 ], and Bong et al [ 30 ].…”

“…Ahlgren et al [ 22 , 23 ] proved that the mandibular plane angle (SN-GoMe) was positively correlated to temporal muscle activity, while Lowe et al [ 24 ] obtained contradictory results. Moller [ 25 ], Ingervall and Thilander [ 26 ], Bakke and Michler [ 27 ], Kayukawa [ 28 ], Farronato et al [ 29 ], and Bong et al [ 30 ] demonstrated that high mandibular angle cases were associated with weaker musculature as opposed to stronger musculature in the low-angle cases. Kayukawa [ 28 ] and Farronato et al [ 29 ] showed higher masticatory muscle activities in deep bite patients than in open bite ones.…”

Sagittal and vertical effects of transverse sagittal maxillary expander (TSME) in three different malocclusion groups

“…Many authors observed that maxillary expansion has different effects in class I, II, and III malocclusions [ 3 , 17 - 22 ]. In the retrospective studies of Farronato et al on 15 growing subjects with maxillary hypoplasia, the effects of RME in the three planes of space were investigated.…”