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Effects of KTP Laser Bleaching on Traumatized Tooth Enamel.

Kinoshita J, Jafarzadeh H, Manabe A, Nozawa M, Uchida T, Abbott PV - Trauma Mon (2014)

Bottom Line: Various methods have been introduced for bleaching, some of which may have adverse effects on soft or hard tissues of the tooth.Smartbleach was highly effective when used with KTP laser (P = 0.0419).Application of KTP laser may increase the bleaching effect of Smartbleach, nevertheless it may cause some enamel damage.

View Article: PubMed Central - PubMed

Affiliation: Department of Esthetic Dentistry, School of Dentistry, Showa University, Tokyo, Japan.

ABSTRACT

Background: Bleaching of traumatized discolored teeth is considered an important issue in esthetic dentistry. Various methods have been introduced for bleaching, some of which may have adverse effects on soft or hard tissues of the tooth.

Objectives: The objective of the study was to evaluate the effects of KTP laser bleaching on enamel of traumatized teeth.

Materials and methods: A square of 36 mm(2) was chosen on the labial surface of 32 extracted teeth. The corners were drilled in order to indicate the location precisely. The shade of each sample was recorded and the teeth were divided into four groups, each with eight teeth: group A (Smartbleach with KTP laser for 30 seconds), group B (Smartbleach with G-Light for 5 minutes), group C (only Smartbleach for 10 minutes) and group D (control group with no bleaching). After one session of bleaching, shade assessment was performed again. In another experiment on nine teeth, Smartbleach with KTP laser was used for 150 seconds to 1500 seconds. The samples were critically processed and observed by using scanning electron microscope (SEM) to assess enamel damage. Data was statistically analyzed using Kruskal-Wallis test (confidence interval level were set at 95%).

Results: Smartbleach was highly effective when used with KTP laser (P = 0.0419). Enamel damage was observed after frequent KTP bleaching and 750 seconds of KTP bleaching was recognized as the limit by morphological evaluation via SEM, indicating a major difference between under and over 750 seconds of bleaching.

Conclusions: Application of KTP laser may increase the bleaching effect of Smartbleach, nevertheless it may cause some enamel damage.

No MeSH data available.


Related in: MedlinePlus

Scanning Electron Microscope Appearance of Enamel After 1500 Seconds of KTP Laser at 30000X MagnificationDamage due to the laser exposure more than 750 seconds can be observed. Some enamel particles were lost from the surface. The “half-floating” particles appear to be removed if any mechanical force (e.g. tooth brushing) is exerted.
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fig9694: Scanning Electron Microscope Appearance of Enamel After 1500 Seconds of KTP Laser at 30000X MagnificationDamage due to the laser exposure more than 750 seconds can be observed. Some enamel particles were lost from the surface. The “half-floating” particles appear to be removed if any mechanical force (e.g. tooth brushing) is exerted.

Mentions: The enamel surface of the control teeth was smooth when observed at 10000X magnification. Intact enamel particles were also observed at 30000X magnification (Figure 1). The tooth exposed to 600 seconds of KTP laser showed scarring on the enamel at 10000X magnification, but it appeared to be the original damage caused mechanically and not chemically or thermally. Other parts of the surface were observed to be smoother in comparison with the control group. At 30000X magnification, intact enamel particles were observed. Teeth exposed to 30, 150, 300 and 450 seconds of bleaching and laser revealed no evident enamel damage when examined under SEM. The tooth exposed to bleaching and laser treatment for 750 seconds showed partial loss of the surface enamel at 10000X magnifications. At 30000X magnification, the eroded surface suggested no contact between the enamel particles (Figure 2). The tooth with 1500 seconds of exposure to bleaching and the laser showed enamel damage when observed at 10000X magnification. At 30000X magnification provided that a mechanical force was exerted (e.g. tooth brushing), enamel particles were lost from the surface (Figure 3). The tooth exposed to 900 seconds of bleaching and laser treatment showed similar damage.


Effects of KTP Laser Bleaching on Traumatized Tooth Enamel.

Kinoshita J, Jafarzadeh H, Manabe A, Nozawa M, Uchida T, Abbott PV - Trauma Mon (2014)

Scanning Electron Microscope Appearance of Enamel After 1500 Seconds of KTP Laser at 30000X MagnificationDamage due to the laser exposure more than 750 seconds can be observed. Some enamel particles were lost from the surface. The “half-floating” particles appear to be removed if any mechanical force (e.g. tooth brushing) is exerted.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4080620&req=5

fig9694: Scanning Electron Microscope Appearance of Enamel After 1500 Seconds of KTP Laser at 30000X MagnificationDamage due to the laser exposure more than 750 seconds can be observed. Some enamel particles were lost from the surface. The “half-floating” particles appear to be removed if any mechanical force (e.g. tooth brushing) is exerted.
Mentions: The enamel surface of the control teeth was smooth when observed at 10000X magnification. Intact enamel particles were also observed at 30000X magnification (Figure 1). The tooth exposed to 600 seconds of KTP laser showed scarring on the enamel at 10000X magnification, but it appeared to be the original damage caused mechanically and not chemically or thermally. Other parts of the surface were observed to be smoother in comparison with the control group. At 30000X magnification, intact enamel particles were observed. Teeth exposed to 30, 150, 300 and 450 seconds of bleaching and laser revealed no evident enamel damage when examined under SEM. The tooth exposed to bleaching and laser treatment for 750 seconds showed partial loss of the surface enamel at 10000X magnifications. At 30000X magnification, the eroded surface suggested no contact between the enamel particles (Figure 2). The tooth with 1500 seconds of exposure to bleaching and the laser showed enamel damage when observed at 10000X magnification. At 30000X magnification provided that a mechanical force was exerted (e.g. tooth brushing), enamel particles were lost from the surface (Figure 3). The tooth exposed to 900 seconds of bleaching and laser treatment showed similar damage.

Bottom Line: Various methods have been introduced for bleaching, some of which may have adverse effects on soft or hard tissues of the tooth.Smartbleach was highly effective when used with KTP laser (P = 0.0419).Application of KTP laser may increase the bleaching effect of Smartbleach, nevertheless it may cause some enamel damage.

View Article: PubMed Central - PubMed

Affiliation: Department of Esthetic Dentistry, School of Dentistry, Showa University, Tokyo, Japan.

ABSTRACT

Background: Bleaching of traumatized discolored teeth is considered an important issue in esthetic dentistry. Various methods have been introduced for bleaching, some of which may have adverse effects on soft or hard tissues of the tooth.

Objectives: The objective of the study was to evaluate the effects of KTP laser bleaching on enamel of traumatized teeth.

Materials and methods: A square of 36 mm(2) was chosen on the labial surface of 32 extracted teeth. The corners were drilled in order to indicate the location precisely. The shade of each sample was recorded and the teeth were divided into four groups, each with eight teeth: group A (Smartbleach with KTP laser for 30 seconds), group B (Smartbleach with G-Light for 5 minutes), group C (only Smartbleach for 10 minutes) and group D (control group with no bleaching). After one session of bleaching, shade assessment was performed again. In another experiment on nine teeth, Smartbleach with KTP laser was used for 150 seconds to 1500 seconds. The samples were critically processed and observed by using scanning electron microscope (SEM) to assess enamel damage. Data was statistically analyzed using Kruskal-Wallis test (confidence interval level were set at 95%).

Results: Smartbleach was highly effective when used with KTP laser (P = 0.0419). Enamel damage was observed after frequent KTP bleaching and 750 seconds of KTP bleaching was recognized as the limit by morphological evaluation via SEM, indicating a major difference between under and over 750 seconds of bleaching.

Conclusions: Application of KTP laser may increase the bleaching effect of Smartbleach, nevertheless it may cause some enamel damage.

No MeSH data available.


Related in: MedlinePlus