Effect of Light Activation on Tooth Sensitivity After In-Office Bleaching

Abstract

This clinical study evaluated the effects of light-emitting diode (LED)/laser activation on bleaching effectiveness (BE) and tooth sensitivity (TS) during in-office bleaching. Thirty caries-free patients were divided into two groups: light-activated (LA) and non-activated (NA) groups. A 35% hydrogen peroxide gel (Whiteness HP Maxx, FGM Dental Products, Joinville SC, Brazil) was used in three 15-minute applications for both groups. For the LA group, LED/laser energy (Whitening Lase Light Plus, DMC Odontológica, São Carlos SP, Brazil) was used, in accordance with the manufacturer's directions. Two sessions of bleaching were performed at one-week intervals. Color was registered at baseline and after the first and second bleaching sessions using a Vita shade guide. Patients recorded TS on a 0 to 4 scale during bleaching and within the next 24 and 48 hours of each session. BE at recall each week and intensity of TS were evaluated by repeated measures analysis of variance (ANOVA) and Tukey tests (α=0.05). Tooth sensitivity was compared using the Friedman repeated measures analysis of variance by rank and the Wilcoxon sign-ranked test. Faster bleaching was observed for the LA group than for the NA group after the first session (4.8 and 3.8 shade guide units [SGUs]; p=0.0001). However, both techniques were capable of bleaching the same number of SGUs after the second bleaching session (p=0.52). Most of the LA group (53.3%) had sensitivity even 24 hours after each bleaching session, but only 26.6% from the NA group reported TS. The intensity of TS was similar for both groups immediately after bleaching but significantly higher for the LA group 24 hours after each bleaching session (p=0.001). After two bleaching sessions, the use of LED/laser light activation did not improve bleaching speed. Persistent tooth sensitivity and higher tooth sensitivity after 24 hours of bleaching were observed when light activation was used.

In-office bleaching effects on the pulp flow and tooth sensitivity – case series

“…2 Fortunately, as long as the in-office bleaching is performed more than once, bleaching of approximately 5 to 8 shade guide units is possible. 2,3,4 Stable results were also demonstrated after 9 and 24 months. 4,5 Even though professional-assisted dental bleaching is considered a safe procedure, tooth sensitivity (TS) is a remarkably common side effect reported by patients.…”

“…4,5 Even though professional-assisted dental bleaching is considered a safe procedure, tooth sensitivity (TS) is a remarkably common side effect reported by patients. 1,3,4 More than 70% of patients who undergo in-office bleaching complain of TS, 6 which leads some patients to forego treatment. 7 The uncomfortable and painful bleaching-induced TS is likely the result of pulp insult by the rapid diffusion of HP molecules.…”

Farkli Ofi̇s Ti̇pi̇ Beyazlatma Si̇stemleri̇ni̇n Beyazlatma Etki̇nli̇kleri̇ni̇n Ve Renk Stabi̇li̇teleri̇ni̇n Karşilaştirilmasi

“…Bazı araştırmacılar lazer ve farklı ışık kaynakları ile daha hızlı beyazlatma gözlemlemiştir. 12,14,25 Buna karşın, bazı çalışmalarda ışık kaynağı ile aktivasyonun HP'nin etkinliğini artırma-dığı bildirilmiştir. 5,15,16 Bu konu üzerine yapılan bir meta-analiz ışık kaynaklarının yüksek konsantrasyonlu hidrojen peroksit jellerinin (%25-35) beyazlatma etkinliğini artırmayabileceğini, ancak düşük konsantrasyonlu hidrojen peroksit jellerin (%15-20) beyazlatma etkinliğini arttırabileceğini rapor etmiştir.…”

“…Diğer çalışmalarda genellikle ışık aktivasyonunun aynı jelin beyazlatma etkinliği üzerine etkisi değerlendirilmiştir. 12,14,25 Çalışmamızda ışık aktivasyonlu sistemlerle beyazlatmadan hemen sonra daha iyi sonuçlar elde edilmesi iki farklı görüş ile açık-lanabilir. İlk olarak ışık uygulaması HP'nin sıcaklığını artırarak, beyazlatma işlemini hızlandırmış olabilir.…”

“…Renkteki geri dönüş uygulama sırasında oluşan dehidratasyona bağlı olabilir. 25 Bu dehidratasyon işlem sırasında dişlerin izole edilmesi, ışık uygulamasına bağlı ısı artışı ve jellerin yüzeyi kaplaması nedeniyle oluşabilir. 26 Yeniden renklenme genellikle dehidratasyona bağlı su emilimi veya beyazlatma ürünlerinin dişin mine tabakası üzerine etkilerinden kaynaklanabilir.…”