Laser Doppler Blood-Flow Signals from Human Teeth during an Alignment and Leveling Movement Using a Superelastic Archwire

Abstract

Objective. The purpose of this study was to examine alterations in blood-flow signals (BFS) from human teeth during an alignment and leveling phase (superelastic wire 0.014′′) in a clinical orthodontic treatment using laser doppler flowmetry (LDF). Materials and Methods. Recordings were made in 12 maxillary left central incisors. The basal value of the BFS from each tooth (without orthodontic forces) was compared with the corresponding values of BFS during four periods of observation: 20 minutes, 48 hours, 72 hours, and one month after the activation of the orthodontic appliance. Results. Statistically significant decrease of BFS was observed at 20 minutes, 48 hours, and 72 hours (P < 0.05). No differences were found comparing BFS on day 30 and the corresponding basal values. Conclusion. Under real clinical conditions, a significant decrease in BFS was verified during the initial phase of the treatment, followed by a recovery on day 30.

Do orthodontic tooth movements induce pulp necrosis? A systematic review

“…Initial screening of databases resulted in 353 studies, with 285 excluded as they were duplicates. From the analysis of the titles and abstracts of the 68 eligible papers, fourteen studies (McDonald & Pitt Ford 1994, Barwick & Ramsay 1996, Brodin et al 1996, Sano et al 2002, Bauss et al 2008a,b, Babacan et al 2010, Salles et al 2013, Sabuncuo glu & Ersahan 2014, Ersahan & Sabuncuo glu 2015, Abu Alhaija et al 2019, Abu Alhaija & Taha 2020 met the inclusion criteria and were selected for fulltext reading.…”

“…Two studies (Bauss et al 2008a,b) were excluded due to the methods used to evaluate pulp status (cold sensibility test, periapical radiographs and crown colour alteration). Therefore, twelve studies were included in the present review (McDonald & Pitt Ford 1994, Barwick & Ramsay 1996, Brodin et al 1996, Sano et al 2002, Babacan et al 2010, Salles et al 2013, Sabuncuo glu & Ersahan 2014, Ersahan & Sabuncuo glu 2015, Abu Alhaija et al 2019, Abu Alhaija & Taha 2020.…”

“…Concerning the orthodontic device, four studies used pre-adjusted edgewise fixed appliances (Salles et al 2013 (Barwick & Ramsay 1996, Sano et al 2002, one study used a removable device (McDonald & Pitt Ford 1994), one study used a modified acrylic bonded device for rapid maxillary expansion (RME; Babacan et al 2010), and two studies used fixed orthodontic devices (Brodin et al 1996, Sano et al 2002.…”

“…As for the type of tooth movement, one study reported tipping movement (Abu Alhaija et al (Brodin et al 1996), and three studies reported alignment and levelling (Salles et al 2013, Ersahan & Sabuncuo glu 2018, Abu Alhaija & Taha 2020. However, only one study (Salles et al 2013) specified the movements applied to align and level the teeth. One study did not specify the movements applied in one of the groups (Abu Alhaija et al…”

“…About the force applied, four studies reported the forces in grams (g), with forces varying from 5 to 500 g (McDonald & Pitt Ford 1994, Barwick & Ramsay 1996, Ersahan & Sabuncuo glu 2015, Sabuncuo glu & Ersahan 2016. Three studies reported the forces in Newtons (N), with forces varying from 0.5 to 2 N (Brodin et al 1996, Sano et al 2002, Salles et al 2013. One study, due to the use of a device for rapid maxillary expansion, described the force application as one-quarter turn once a day (Babacan et al 2010).…”